Home

PDF Abaqus Release Notes

1. CONTENTS 12 4 12 5 13 1 13 2 13 3 13 4 13 5 13 6 13 7 13 8 15 1 15 2 15 3 15 4 INTRODUCTION TO Abaqus 6 13 1 Introduction to Abaqus 6 13 This document introduces features in Abaqus that have been added enhanced or updated since the Abaqus 6 12 release Chapter 1 provides a brief overview of the Abaqus products included in this release Chapters 2 14 provide short descriptions of new Abaqus 6 13 features in Abaqus Standard Abaqus Explicit Abaqus CFD and Abaqus CAE categorized by subject e Chapter 2 General enhancements general changes to the Abaqus interface e Chapter 3 Modeling features related to creating your model e Chapter 4 Analysis procedures features related to defining an analysis e Chapter 5 Analysis techniques features related to analysis techniques in Abaqus e Chapter 6 Materials new material models or changes to existing material models e Chapter 7 Elements new elements or changes to existing elements e Chapter 8 Prescribed conditions loads boundary conditions and predefined fields e Chapter 9 Constraints kinematic constraints e Chapter 10 Interactions features related to contact and interaction modeling e Chapter 11 Meshing features related to meshing your model e Chapter 12 Execution commands and utilities for running any of the Abaqus products e Chapter 13 Output and visualization obta
2. RAYLEIGH parameter We recommend the use of the new values although the old names are still recognized For VISCOUS COMPOSITE in a SIM based analysis using the Lanczos eigensolver scaling factors for the mass and stiffness weighted fraction of composite critical damping can be specified on the data lines MOTION Use the new optional ELEMENT parameter to prescribe a translational or a rotational velocity to an element set in an eddy current analysis PERMANENT MAGNETIZATION Specify permanent magnetization PHYSICAL CONSTANTS This option is now available in Abaqus CFD analyses SFILM This option is now available in Abaqus CFD analyses SRADIATE This option is now available in Abaqus CFD analyses SUBSTRUCTURE MATRIX OUTPUT Writing the substructure matrices to the output database odb file is no longer supported SURFACE The TYPE parameter can now take the value XFEM to generate a crack surface for enriched cracked elements The generated surface is supported only for the application of distributed pressure loads SURFACE PROPERTY ASSIGNMENT The PROPERTY parameter can now take the value BEAM SMOOTHING to control smoothing of beam segments in beam to beam contact SURFACE SECTION Use the new AQUAVISUALIZATION parameter to enable visualization of gravity waves in an Abaqus Aqua analysis TURBULENCE MODEL The TYPE parameter can now take the value KOMEGA SST to specify the shear stress transport k w turbulence m
3. only the mappings you specified for part instances are recorded to the model database output database or file Abaqus CAE Usage All modules File Save Session Objects or Load Session Objects Color Mapping References Abaqus CAE User s Guide e Managing session objects and session options Section 9 9 in the HTML version of this guide e Understanding color coding Section 77 1 2 1 GENERAL ENHANCEMENTS 2 2 Viewing boundary conditions in the Visualization module Product Abaqus CAE Benefits You can now view boundary conditions when you display a model database in the Visualization module Description Abaqus CAE now includes boundary conditions among the attributes that you can display when you open a model database in the Visualization module The Field Output toolbar displays a B before the name of each boundary condition that is available for display in the current step For boundary conditions that include degrees of freedom such as displacement rotation you can select the individual degree of freedom you want to display after selecting the boundary condition Figure 2 1 shows an example in which the U2 degree of freedom is displayed for a displacement boundary condition named Contacts The Field Output toolbar is included in the example to show how the individual values can be selected x Figure 2 1 Visualization of boundary conditions 2 2 GENERAL ENHANCEMENTS Abaqus CAE Usage Visualiza
4. The wall functions used in the Spalart Allmaras and k w turbulence models have been enhanced to produce results that are more independent of near wall mesh resolution The behavior asymptotes to that of a standard wall function for coarse meshes and asymptotes to that of a wall function free approach for fine meshes Blending functions are used for intermediate meshes to optimize accuracy 4 6 Reference Abaqus Analysis User s Guide e Incompressible fluid dynamic analysis Section 6 6 2 4 7 ANALYSIS PROCEDURES ANALYSIS TECHNIQUES 5 Analysis techniques This chapter discusses features related to analysis techniques in Abaqus It provides an overview of the following enhancements e New approach for mesh smoothing Section 5 1 e Enhancements to the XFEM based crack propagation capability Section 5 2 e Enhancements for import analysis Section 5 3 e Substructure generation using the AMS eigensolver Section 5 4 e Substructuring enhancements Section 5 5 e Discrete element method Section 5 6 e Parallel enhancement of SPH analysis Section 5 7 e Co simulation between electromagnetic and thermal or stress analysis procedures Section 5 8 e Global and element by element matrix generation in heat transfer analyses Section 5 9 e Matrix input capability enhancements Section 5 10 5 1 New approach for mesh smoothing Product Abaqus CFD Benefits The new i
5. You can now request this output using the new output variable STHIN Reference Abaqus Analysis User s Guide e Abaqus Explicit output variable identifiers Section 4 2 2 13 5 USER SUBROUTINES UTILITIES AND PLUG INS 14 User subroutines utilities and plug ins This chapter discusses additional user programs that can be run with Abaqus It provides an overview of the following enhancement e VUEOS User subroutine to define equation of state material model Section 14 1 14 1 VUEOS User subroutine to define equation of state material model Product Abaqus Explicit Benefits You can now use user subroutine VUEOS to define a hydrodynamic material model in which the material s volumetric response is determined by your own definition of the equation of state Description The equation of state defines the pressure as a function of the current density p and the internal energy per unit mass Em p f p Em Abaqus Explicit solves the energy equation together with the equation of state using an iterative method The pressure stress p and the derivatives of the pressure with respect to the internal energy and to the density 0p OE and Op dp must be provided by user subroutine VUEOS References Abaqus Analysis User s Guide e User defined equation of state in Equation of state Section 25 2 1 Abaqus Keywords Reference Guide e EOS Abaqus User Subroutines Reference Guide e VUEOS
6. and field variables was not available with the general contact algorithm in Abaqus Explicit References Abaqus Analysis User s Guide e Frictional behavior Section 37 1 5 Abaqus Keywords Reference Guide e FRICTION 10 6 User defined tracking thickness for user subroutine VUINTER Product Abaqus Explicit Benefits You can improve performance of Abaqus Explicit models that involve user subroutine VUINTER Description You can now limit the contact search distance for contact pairs referring to user subroutine VUINTER to improve analysis efficiency By default and previously in all cases a candidate point of interaction on the master surface is determined for each slave node for contact pairs associated with VUINTER including slave nodes far removed from the master surface Detailed contact searches which often require significant computation time can now be avoided for slave nodes a safe distance away from the master surface in the current configuration if a user defined tracking thickness is specified References Abaqus Analysis User s Guide e User defined interfacial constitutive behavior Section 37 1 6 Abaqus Keywords Reference Guide e SURFACE INTERACTION Abaqus User Subroutines Reference Guide e VUINTER Section 1 2 16 10 6 MESHING 11 Meshing This chapter discusses features related to meshing your model It provides an overview of the following enhancements e Querying fo
7. axisymmetric models Abaqus CAE Usage Interaction module Special Crack Create Name crack name Type Debond using VCCT select the step and the surface to surface Standard interaction Debonding force Step or Ramp References Abaqus Analysis User s Guide e Crack propagation analysis Section 11 4 3 Abaqus CAE User s Guide e Using the virtual crack closure technique to model crack propagation Section 31 4 3 6 Assigning sections to element sets Product Abaqus CAE Benefits You can now assign sections to element sets as well as to geometric sets Description In previous releases you could assign sections only to geometric sets in the Property module Abaqus CAE now lets you assign sections to sets of meshed elements that you have previously defined as shown in Figure 3 5 r Region Selection m Eligible Sets Sets below may contain elements cells shell faces or wire edges Name filter Name Type Set 2 elements Element Continue Dismiss Figure 3 5 Selecting element sets for section assignment 3 6 Abaqus CAE Usage Property module Assign Section click Sets select named element set from list Reference Abaqus CAE User s Guide e Assigning a section Section 12 15 1 in the HTML version of this guide MODELING ANALYSIS PROCEDURES 4 Analysis procedures This chapter discusses features related to defining an analysis It provides an overvi
8. CAE Benefits You can now copy a two dimensional pattern of element faces onto a similar geometric face This enhancement allows you to use a similar customized mesh on multiple faces Description The Copy mesh pattern method in the Edit Mesh toolset is available for use with parts and assemblies With this new method you can copy a two dimensional mesh and apply it to a target geometric face elsewhere on the same part or assembly The pattern and target do not need to be identical however they must be topologically similar For example the target face must contain at least as many loops as the pattern After selecting the pattern and target you must map several nodes from the pattern onto their desired positions on the target Abaqus CAE completes the mapping of nodes and copies the pattern onto the target Abaqus CAE Usage Mesh module Mesh Edit Mesh category Copy mesh pattern Reference Abaqus CAE User s Guide e Copying a mesh pattern Section 64 7 10 in the HTML version of this guide 11 3 Smoothing external node positions Product Abaqus CAE Benefits You can automatically smooth the positions of external mesh nodes You can smooth the nodes of a meshed face and use the smoothed mesh to create a bottom up or swept mesh Smoothing provides an automated method for improving the mesh on a face without changing the connectivity between the mesh and the underlying geometry Description The Smooth method in the Edit
9. Description Abaqus Standard analyses that activate the unsymmetric solver can now use GPGPU to accelerate the equation solver phase of the analysis Previously only the symmetric equation solver was supported with GPGPU Reference Abaqus Analysis User s Guide e Parallel execution in Abaqus Standard Section 3 5 2 12 2 Configuration file requirement for co simulation execution Products Abaqus Standard Abaqus Explicit Abaqus CFD Abaqus CAE Benefits The new SIMULIA Co Simulation Engine configuration file provides a general and extensible way to define a multiphysics co simulation Description Co simulation requires the interaction of simulation programs from different physical numerical and computing domains The SIMULIA Co Simulation Engine configuration file defines the simulation programs participating in a multiphysics co simulation and the fields exchanged between the simulation programs as well as the data exchange patterns and frequency The co simulation configuration file is required when using the SIMULIA Co Simulation Engine for coupling Abaqus to Abaqus or to a third party solver When you use Abaqus CAE to execute the co simulation between Abaqus solvers the configuration file is created for you automatically EXECUTION References Abaqus Analysis User s Guide e SIMULIA Co Simulation Engine director execution Section 3 2 3 e Abaqus Standard Abaqus Explicit and Abaqus CFD co simulation executio
10. License management parameters Section 4 1 6 of the Abaqus Installation and Licensing Guide Changes to documentation Because the translation functionality in the Abaqus Interface for MSC ADAMS has been integrated into Abaqus Standard as the abaqus adams execution procedure the Abaqus Interface for MSC ADAMS User s Guide has been removed from the Abaqus documentation collection For information about running the abaqus adams execution procedure see Translating Abaqus data to msc adams modal neutral files Section 3 2 34 of the Abaqus Analysis User s Guide for translation examples see Translating Abaqus data to modal neutral file format for analysis in MSC ADAMS Section 15 1 7 of the Abaqus Example Problems Guide Changes in the Abaqus Scripting Interface Abaqus makes every attempt to be backward compatible and can execute most Abaqus Scripting Interface scripts from previous releases of Abaqus However backward compatibility is not guaranteed beyond several releases of Abaqus and it is recommended that you upgrade your commands to the most recent release A complete list of Abaqus Scripting Interface commands that have changed is included in Summary of Abaqus Scripting Interface changes between Abaqus 6 12 and Abaqus 6 13 in the Abaqus Scripting Reference Guide 1 3 Changes in interpretation of input data A list of changes to the Abaqus input file interface is provided in Chapter 15 Summary of changes GE
11. Section 1 2 11 Abaqus Verification Guide e Equation of state material Section 2 2 20 SUMMARY OF CHANGES 15 Summary of changes This section summarizes the changes and the additions that have been made to the items that define an Abaqus model including elements keywords user subroutines and output variables For more information on these modifications refer to the preceding chapters The following identifiers are used new New in 6 13 mod Existed in 6 12 but has been modified or enhanced in 6 13 rem Existed in 6 12 but has been removed in 6 13 S New modified or removed in Abaqus Standard E New modified or removed in Abaqus Explicit C New modified or removed in Abaqus CFD 15 1 Changes in Abaqus elements This section summarizes the changes and the additions that have been made to the elements that can be used in an Abaqus model new C FC3D5 5 node pyramid new S EMC3D6 6 node prism electromagnetic element new E PD3D 1 node discrete particle 15 2 Changes in Abaqus options This section summarizes the changes and the additions that have been made to the options that define an Abaqus model mod E ADAPTIVE MESH REFINEMENT Use the new LEVEL parameter to specify the maximum number of levels of refinement mod C CFD Use the new STEADY STATE parameter to activate the steady state flow solver capabilities 5 SUMMARY OF CHANGES mod S new S mod E mod E
12. Section 3 2 24 12 3 OUTPUT AND VISUALIZATION 13 Output and visualization This chapter discusses obtaining postprocessing and visualizing results from Abaqus analyses It provides an overview of the following enhancements e Visualization of gravity waves in Abaqus Aqua Section 13 1 e Visualizing initial strain free adjustments Section 13 2 e Enhanced diagnostics for nearly incompressible materials and instabilities Section 13 3 e Visualizing component surfaces for Abaqus Explicit general contact Section 13 4 e Customizing element orientation for composite output Section 13 5 e Yield stress output Section 13 6 e Adjusted or redistributed mass output Section 13 7 e Section thinning or thickening output Section 13 8 13 1 Visualization of gravity waves in Abaqus Aqua Product Abaqus Aqua Benefits You can visualize the behavior of the water surface under gravity waves in Abaqus Aqua Description This feature allows you to visually confirm the gravity wave behavior When a wave is defined its behavior can be observed by defining a surface comprised of surface elements This feature is available only in three dimensional analysis wherein the z direction wave displacements are mapped onto the surface This surface does not interact with the structure its only purpose is for visualization References Abaqus Analysis User s Guide e Abaqus Aqua analysis Section 6 1
13. These enhancements provide more flexibility for analyzing results that include composite sections Description Abaqus CAE now provides two enhancements for display of element output from composite sections in an output database e You can now customize the display of composite sections in your results so that Abaqus CAE displays the data by using a single material orientation for the entire composite layup rather than the material orientation on each ply e You can now transform tensor and vector fields in your results into the layup orientation defined in the composite section definition Both enhancements require that output from the SORIENT field output variable be present in the output database Abaqus CAE Usage Visualization module Result Options Transformation tabbed page Layup orientation Options Material Orientation Orientation composites only Ply or Layup References Abaqus CAE User s Guide e Transforming results into a new coordinate system Section 42 6 8 in the HTML version of this guide e Customizing material orientation plot triads Section 46 4 1 in the HTML version of this guide 13 6 Yield stress output Products Abaqus Standard Abaqus Explicit Abaqus Viewer Benefits You can now request element yield stress output Description The new output variable YIELDS can be requested to obtain element yield stress output for the Mises Johnson Cook and Hill plasticity material models It is
14. always dependent not independent e You can freely mix model instances with part instances e Model instance subassemblies can contain either geometric parts or orphan mesh parts e Model instances can be positioned and oriented in the main assembly by using transformations Translate Translate To Rotate and positioning constraints linear and radial patterns are not supported with model instances e Part instance commands such as Suppress Resume Hide Show Delete and Show Parents Children can also be used on model instances Replace Switch Context Exclude from Simulation and Merge Cut are not supported with model instances MODELING 5 Create Instance Eel Create instances from Parts Models Models Model 2 model 4 cylinder Note The part instances of the selected model s will be created as Dependent instances in the current model Auto offset from other instances oK Apply Cancel Figure 3 3 Creating model instances e Sets or surfaces defined in the referenced model are brought into the model instance maintaining the Model Tree hierarchy of features e Model instances are supported and selectable in Display Groups and in the Instance tab of the Assembly Display Options Abaqus CAE Usage Assembly module Instance Create from Models References Abaqus CAE User s Guide e Working with model instances Section 13 4 e Creating a part or model ins
15. data and to propagate design changes between NX and Abaqus CAE The Abaqus CAE Associative Interface for NX can be purchased and downloaded from Elysium Inc www elysiuminc com e Geometry Translator for CATIA V4 This add on capability allows the user to import the geometry of CATIA V4 format parts and CATIA V4 assemblies model catdata and exp files directly into Abaqus CAE e Geometry Translator for Parasolid This add on capability allows the user to import the geometry of Parasolid format parts and Parasolid assemblies x_t x_b and xmt files directly into Abaqus CAE Translator utilities e Abaqus translators are provided with the release They are invoked through the Abaqus execution procedure the driver The translators and the commands to invoke them are described below abaqus fromansys translates an ANSYS input file to an Abaqus input file abaqus fromdyna translates an LS DYNA keyword file to an Abaqus input file El INTRODUCTION TO Abaqus 6 13 abaqus fromnastran translates a Nastran bulk data file to an Abaqus input file abaqus frompamcrash translates a PAM CRASH input file to a partial Abaqus input file abaqus fromradioss translates a RADIOSS input file to a partial Abaqus input file abaqus adams translates the results in an Abaqus SIM database file into an MSC ADAMS modal neutral mn file the format required by ADAMS Flex abaqus tonastran translates an Abaqus input file to Nastran bulk data fil
16. eigenvalue convergence has been reduced from 10 to 10 for better convergence This may however increase the number of iterations Table 1 1 illustrates the performance improvement in the buckle step using the new subspace iteration method All three models were run on an 8 core 2 27 GHz Intel Nehalem processor machine with 24 GB RAM ANALYSIS PROCEDURES Table 4 1 Performance improvement of the buckle step using the new subspace iteration algorithm N mi Abaqus 6 12 Abaqus 6 13 DOF ne Speed Model ER of Millions up Modes Number Wall Time Number Wall Time of Minutes of Minutes Iterations Iterations 1 0 5 40 233 884 280 116 7 62 160 57 984 89 167 5 9 2 1 14 40 60 112 78 57 4 1 95 160 132 1223 195 511 2 4 3 0 5 40 155 216 121 47 4 6 160 127 833 168 235 3 54 References Abaqus Keywords Reference Guide e BUCKLE e FREQUENCY 4 2 eigenmodes Product Abaqus Standard The SIM architecture supports coupled structural acoustic Benefits The coupled structural acoustic eigenmodes extracted by the Lanczos eigensolver can be stored on the SIM architecture In addition the modal methods can utilize these modes for superposition Description If the model includes structural acoustic coupling Abaqus Standard can extract coupled modes The coupled eigenmodes can now be stored on the SIM architecture which is much more efficient than the traditional a
17. long duration transient flow simulation Description You can now solve steady state incompressible flow problems in Abaqus CFD which complements the existing transient flow functionality The steady state solver implementation relies on under relaxation of the nonlinear solution during successive iterations This procedure terminates after a specified number of iterations 4 5 ANALYSIS PROCEDURES References Abaqus Analysis User s Guide e Incompressible fluid dynamic analysis Section 6 6 2 Abaqus Keywords Reference Guide e CFD 4 8 K omega turbulence model in Abaqus CFD Product Abaqus CFD Benefits You can now apply the popular SST k w turbulence model to fluid flow problems Description The SST k w turbulence model is a two equation model The model can be applied throughout the viscous sublayer without further modification in contrast to the alternative k e model The SST form of the k w model includes the additional benefits of reduced sensitivity to freestream turbulence values and a limiter to prevent excessive shear stress levels in boundary layers References Abaqus Analysis User s Guide e Incompressible fluid dynamic analysis Section 6 6 2 Abaqus Keywords Reference Guide e TURBULENCE MODEL 4 9 Hybrid wall functions in Abaqus CFD Product Abaqus CFD Benefits The Spalart Allmaras and k w turbulence models now exhibit reduced sensitivity to the boundary layer mesh size Description
18. model heat conduction in solids provided there are no fluids in the model This new capability is distinct from the existing capability to perform fluid analysis with heat transfer General temperature dependent conductivity convection and radiation boundary conditions are supported Nonlinearity can be introduced through temperature dependent material properties and radiation boundary conditions 4 4 ANALYSIS PROCEDURES References Abaqus Analysis User s Guide e Uncoupled heat transfer analysis Section 6 5 2 Abaqus Keywords Reference Guide e ENERGY EQUATION SOLVER e HEAT TRANSFER 4 6 Prescribed motion in eddy current simulations Product Abaqus Standard Benefits You can prescribe motional velocity in both time harmonic and transient eddy current simulations Description A translational or a rotational velocity of a conductor in a magnetic field results in motional contributions to the electromagnetic induction in the conductor Such effects are important in applications such as induction heating where the workpiece is often moved with a constant velocity to result in uniform heating References Abaqus Analysis User s Guide e Eddy current analysis Section 6 7 5 Abaqus Keywords Reference Guide e MOTION 4 7 Steady state analysis in Abaqus CFD Product Abaqus CFD Benefits You can solve steady state flow problems directly eliminating the need to approximate steady state conditions using a
19. or CSV file formats abaqus python accesses the Python interpreter abaqus resume resumes an Abaqus analysis job abaqus script initiates a Python scripting session abaqus substructurecombine combines the model and results data produced by two of a model s substructures into a single output database file abaqus suspend suspends an Abaqus analysis job abaqus terminate terminates an Abaqus analysis job abaqus upgrade upgrades an input file or output database file from previous versions of Abaqus to the current version Platform support Analysis products Abaqus Standard Abaqus Explicit and Abaqus CFD and interactive products Abaqus CAE and Abaqus Viewer are supported on the following platforms e Windows x86 64 e Linux x86 64 Changes to licensing The following enhancements to Abaqus licensing have been implemented e A new utility is available to generate historical reports from license usage data The utility can be run with the following command abaqus licensing reporttool options For more information see Using the reporttool utility Section 3 10 of the Abaqus Installation and Licensing Guide e A new environment file parameter Improject can be used to record information about internal project names or numbers for your company The information is recorded on the license server and can INTRODUCTION TO Abaqus 6 13 be retrieved by generating reports using the new report tool For more information see
20. pairs Section 36 3 5 Controlling initial contact status for general contact in Abaqus Explicit Section 36 4 4 Adjusting initial surface positions and specifying initial clearances for contact pairs in Abaqus Explicit Section 36 5 4 13 3 Enhanced diagnostics for nearly incompressible materials and instabilities Product Abaqus Standard Benefits You can improve your model based on more descriptive diagnostics Description The following diagnostic enhancements are included in Abaqus Standard Diagnostic output to the printed output dat file has been added to encourage use of hybrid element types in Abaqus Standard for cases of nearly incompressible elastic and hyperelastic materials Hybrid element type names end in H for example C3D8H Hybrid elements help avoid numerical problems when a material is incompressible or nearly incompressible As in past releases hybrid elements must be used for fully incompressible materials Use of hybrid elements will often greatly improve convergence behavior when a material is nearly incompressible In Abaqus 6 13 a warning message is issued to the printed output file for Abaqus Standard if the effective initial Poisson s ratio exceeds 0 48 which corresponds to the initial bulk modulus exceeding 24 667 times the initial shear modulus within non hybrid elements By default an error message is issued instead of a warning message if the effective initial Poisson s ratio e
21. process can be a more efficient modeling option because each stitching operation can require a fair amount of processing power to complete Abaqus CAE Usage Part module Tools Geometry Edit Face From element faces click Options in the prompt area Reference Abaqus CAE User s Guide e Create face from element faces Section 69 7 10 in the HTML version of this guide 3 3 Model instances in Abaqus CAE Product Abaqus CAE Benefits You can now reuse existing models by creating instances of any model within another parent model Description You can create instances of other models in your main model allowing you to add complete subassemblies in addition to individual parts Model instances are created in the same way as part instances and can be positioned and manipulated in a similar fashion When you create anew model instance the main assembly ofthe referenced model is instantiated in the assembly of the current working model Model instances produce a subassembly from the contents of the other model Since the referenced model assembly may contain other model instances as children multiple levels of complex subassemblies are possible Model instances can be created from the Create Instance dialog box as shown in Figure 3 3 Model instances have the following characteristics e A particular model can be instantiated multiple times and you can instantiate as many different models as desired e Model instances are
22. time integration Its powerful contact capabilities reliability and computational efficiency on large models also make it highly effective for quasi static applications involving discontinuous nonlinear behavior Abaqus CFD This product is a computational fluid dynamics program with extensive support for preprocessing simulation and postprocessing in Abaqus CAE Abaqus CFD provides scalable parallel CFD simulation capabilities to address a number of nonlinear coupled fluid thermal and fluid structural problems Preprocessing and postprocessing Abaqus CAE This product is a Complete Abaqus Environment that provides a simple consistent interface for creating submitting monitoring and evaluating results from Abaqus simulations Abaqus CAE is divided into modules where each module defines a logical aspect of the modeling process for example defining the geometry defining material properties generating a mesh submitting analysis jobs and interpreting results Abaqus Viewer This subset of Abaqus CAE contains only the postprocessing capabilities of the Visualization module It uses the output database odb to obtain results from the analysis products El INTRODUCTION TO Abaqus 6 13 The output database is a neutral binary file Therefore results from an Abaqus analysis run on any platform can be viewed on any other platform supporting Abaqus Viewer It provides deformed configuration contour vector and X Y plots as well as anima
23. 1 1 e Surface elements Section 32 7 1 Abaqus Keywords Reference Guide e SURFACE SECTION 13 2 Visualizing initial strain free adjustments Product Abaqus Explicit Benefits You can view strain free adjustments in the same easy way for Abaqus Explicit and Abaqus Standard simulations OUTPUT AND VISUALIZATION Description Output variable STRAINFREE previously available for Abaqus Standard simulations is now available for Abaqus Explicit simulations Strain free adjustments are made for some models to resolve initial noncompliance of contact and constraints Some strain free adjustments modify the initial configuration and other types of strain free adjustments modify the initial displacement Displacement U output at zero time only shows the effects of some strain free adjustments however STRAINFREE output includes the effects of all types of strain free adjustments If any strain free adjustments exist output variable STRAINFREE is written automatically to the output database odb file for the original field output frame at zero time References Abaqus Analysis User s Guide Abaqus Standard output variable identifiers Section 4 2 1 Abaqus Explicit output variable identifiers Section 4 2 2 Mesh tie constraints Section 35 3 1 Controlling initial contact status in Abaqus Standard Section 36 2 4 Adjusting initial surface positions and specifying initial clearances in Abaqus Standard contact
24. CHNIQUES are now available for model transfer In addition the model transfer capability is extended to support the use of any element set Description In an import analysis model transfer is facilitated by the specification of element sets that define the model to be extended You can import any element sets that you defined in the original analysis previously only element sets used to define the section properties could be imported Imported element sets can consist of elements of type MASS and ROTARYI in addition to other supported element types The presence of overlapping elements in the imported element sets is allowed since duplicate element entries are eliminated References Abaqus Analysis User s Guide e Transferring results between Abaqus analyses overview Section 9 2 1 e Transferring results between Abaqus Explicit and Abaqus Standard Section 9 2 2 e Transferring results from one Abaqus Standard analysis to another Section 9 2 3 e Transferring results from one Abaqus Explicit analysis to another Section 9 2 4 Abaqus Keywords Reference Guide e IMPORT Abaqus Example Problems Guide e Deep drawing of a square box Section 1 5 2 Abaqus Verification Guide e Transferring mass and rotary inertia elements Section 3 14 8 5 4 Substructure generation using the AMS eigensolver Products Abaqus Standard Abaqus AMS Benefits A new innovative algorithm generating a free interface or
25. DS DASSAULT SUSTEMES Release Notes 3DEXPERIENCE Abaqus Release Notes Legal Notices CAUTION This documentation is intended for qualified users who will exercise sound engineering judgment and expertise in the use of the Abaqus Software The Abaqus Software is inherently complex and the examples and procedures in this documentation are not intended to be exhaustive or to apply to any particular situation Users are cautioned to satisfy themselves as to the accuracy and results of their analyses Dassault Syst mes and its subsidiaries including Dassault Syst mes Simulia Corp shall not be responsible for the accuracy or usefulness of any analysis performed using the Abaqus Software or the procedures examples or explanations in this documentation Dassault Syst mes and its subsidiaries shall not be responsible for the consequences of any errors or omissions that may appear in this documentation The Abaqus Software is available only under license from Dassault Syst mes or its subsidiary and may be used or reproduced only in accordance with the terms of such license This documentation is subject to the terms and conditions of either the software license agreement signed by the parties or absent such an agreement the then current software license agreement to which the documentation relates This documentation and the software described in this documentation are subject to change without prior notice No part of this documen
26. ECTION Specify element properties for discrete elements ELEMENT OPERATOR OUTPUT Write element operator output to a SIM document EMBEDDED ELEMENT Use the new PARTIAL EMBED parameter if the host elements are expected to only partially embed the embedded elements ENERGY EQUATION SOLVER Specify the linear solver and parameters for solving the conduction equations in Abaqus CFD EOS The TYPE parameter can now take the value USER for a user defined equation of state that is defined in user subroutine VUEOS Use the new PROPERTIES parameter to set the number of property values needed as data in user subroutine VUEOS FREQUENCY The NSET parameter can now be included with no value to allow Abaqus Standard to automatically select the nodes at which eigenvectors will be computed HEAT TRANSFER This option is now available in Abaqus CFD analyses Use the new CENTERING parameter to select an element centered heat transfer analysis Use the new TYPE parameter to indicate a heat transfer analysis using Abaqus CFD MODAL DAMPING For better naming and clarity several parameters and parameter values have been renamed The new value VISCOUS FRACTION OF CRITICAL DAMPING replaces MODAL DIRECT The new value VISCOUS COMPOSITE replaces MODAL COMPOSITE The new value VISCOUS RAYLEIGH replaces the 15 3 SUMMARY OF CHANGES mod S new S mod C mod C mod C mod S mod S mod S E mod A mod C mod S
27. Mesh toolset is available for use with external nodes on native meshed parts or assemblies and within planar orphan mesh faces Abaqus CAE adjusts the positions of selected nodes by applying a Laplacian smoothing algorithm The smoothing process generally tries to equalize the distance between adjoining nodes and it provides an automated alternative to editing or dragging 11 2 MESHING individual nodes to improve a mesh Smoothing does not change the positions of boundary nodes Figure 11 2 shows a meshed face before smoothing on the left and after smoothing on the right Figure 11 2 Smoothing nodes on a meshed face Abaqus CAE Usage Mesh module Mesh Edit Node category Smooth Reference Abaqus CAE User s Guide e Smoothing external nodes Section 64 5 8 in the HTML version of this guide 11 4 Enhanced verification options for mesh quality Product Abaqus CAE Benefits The Verify Mesh dialog box now provides access to a wider range of options for verifying mesh element quality Description Abaqus CAE now offers the following enhancements to mesh verification e Abaqus CAE highlights and displays data for elements that meet the failure criteria specified on multiple tabbed pages in the dialog box rather than highlighting and displaying data for elements that fail only those checks on the currently selected tabbed page e The mesh verification process now checks by element face shape rather than by element shape
28. NERAL ENHANCEMENTS 2 General enhancements This chapter describes the following general enhancements that have been made to Abaqus e Persistent color mapping Section 2 1 e Viewing boundary conditions in the Visualization module Section 2 2 e Enhanced viewport linkage Section 2 3 2 1 Persistent color mapping Product Abaqus CAE Benefits You can now save color mapping definitions to the model database to an output database or to an XML file This enhancement provides an easier method for saving and reusing color mappings than in earlier releases Description By default the color mappings you specify to distinguish between components in your model persist only for your current session and only in the viewport in which you define them In earlier releases you could save color mappings only by creating a color macro that recorded your color mapping definitions Abaqus CAE now includes color mappings among the session objects and options that you can save and reuse using the Save Session Objects amp Options and Load Session Objects amp Options dialog boxes This enhancement streamlines the process of saving and loading color mappings by including this step with the maintenance of other settings in your session When you save color mappings as session options Abaqus CAE records the settings currently displayed in the Color Code dialog box only For example if the dialog box displays color mappings for part instances
29. Standard allows the user to select the automatic multi level substructuring AMS eigensolver when performing a natural frequency extraction Co simulation with MpCCI This add on analysis capability for Abaqus can be used to solve multiphysics problems by coupling Abaqus with any third party analysis program that supports the MpCCl interface Interfaces Abaqus Interface for Moldflow This optional interface translates finite element model information from a Moldflow analysis to an Abaqus input file Associative interfaces and geometry translators SIMULIA Associative Interface for Abaqus CAE This add on capability for Abaqus CAE creates a connection between a CATIA V6 session and an Abaqus CAE session This connection can be used to transfer model information from CATIA V6 to Abaqus CAE Subsequent modifications to the model in INTRODUCTION TO Abaqus 6 13 CATIA V6 can be propagated to the Abaqus CAE model while retaining any analysis features such as loads or boundary conditions that were defined on the model in Abaqus CAE The CATIA V6 model in an assembly file eaf format can also be imported directly into Abaqus CAE e CATIA V5 Associative Interface This add on capability for Abaqus CAE creates a connection between a CATIA V5 session and an Abaqus CAE session This connection can be used to transfer model information from CATIA V5 to Abaqus CAE Subsequent modifications to the model in CATIA V5 can be propagated to the Abaqus CAE mo
30. This change means that you do not have to locate and click the element shape you want to verify in the viewport as you specify verification criteria e The Verify Mesh dialog box now displays only the verification options that are relevant for your model For example if your model does not have any elements with triangular faces the dialog box hides tests for the triangular face corner angle 11 3 MESHING e Abaqus CAE now highlights elements that fail the shape and size criteria using the warning color rather than highlighting them as errors that is as elements that fail the checks found in the input file processor in Abaqus Standard and Abaqus Explicit Therefore elements that fail the shape and size criteria will be colored yellow by default e Abaqus CAE retains the most recent checks and criteria you specify and they are available in your next session e Abaqus CAE now groups the output of size metrics criteria by element shape separate sections are displayed for data related to tetrahedral elements triangular elements hexahedral elements and quadrilateral elements Figure 11 3 shows the revised Shape Metrics options in the Verify Mesh dialog box for a part with both triangular and quadrilateral element faces Mesh Shape Size Analysis Metrics Metrics Checks Element Failure Criteria Shape Factor 0 0001 Tri Face Corner Angle Less Than 3 F Greater than 170 Quad Face Corner Angl
31. This example involves a shell surface in frictional contact with a roller guide with 10 3 INTERACTIONS no relative sliding in the contact region The reference surface of the shell which contains the shell nodes is offset from the reference surface of the roller in the contact region by the half shell thickness As shown in the figure some difference in tangential motion between the two reference surfaces should exist due to rotation of the thickness offset Assuming that the axis of the roller has no translational motion incremental displacements of points on reference surfaces in the sticking contact region should be and now are proportional to the radial distance from the roller axis for this type of simulation even for very small increment sizes fi Translational motion at points on reference surfaces ve Sticking friction a ep 2 Y Oo j ve e Y E 2 Ka 2 5 Nodal rotation during interval Figure 10 1 Example with slip increment affected by shell thickness e Each frictional and normal contact constraint should generate zero net force and zero net moment among all nodes associated with the constraint however in previous releases frictional constraints in Abaqus Explicit would generate a net moment when reference nodes were offset from the contact interface Now frictional constraints apply a moment to reference nodes offset from the contact interface due to shell or beam t
32. ameter to globally control usage of edge to edge beam to beam contact formulations CONTACT STABILIZATION Use the new USER ADAPTIVE setting for the SCALE FACTOR parameter to scale the contact stabilization coefficient by a factor that decreases within each increment according to the pattern specified on the last data line CONTROLS Use the new MESH SMOOTHING parameter to choose the approach for mesh smoothing in an Abaqus CFD analysis CO SIMULATION The CONTROLS parameter is no longer required when specifying PROGRAM MULTIPHYSICS Algorithm controls previously specified through the referenced CO SIMULATION CONTROLS are now specified through the SIMULIA Co Simulation Engine configuration file The coupling with MADYMO is not currently supported so PROGRAM MADYMO is not available 15 2 mod S mod S E new E new S mod S E new C mod E mod S mod C mod S SUMMARY OF CHANGES DAMAGE INITIATION Use the new POSITION parameter to specify the location used to measure if the crack initiation criterion is satisfied for enriched elements in an Abaqus Standard analysis DIAGNOSTICS This option is now available in Abaqus Standard analyses Use the new NONHYBRID INCOMPRESSIBLE parameter to replace error messages written to the data dat file during preprocessing with corresponding warning messages for nonhybrid solid elements that have an initial Poisson ratio greater than 0 495 DISCRETE S
33. ancements Temperature and field variable dependence of the friction coefficient User defined tracking thickness for user subroutine VUINTER Meshing Querying for geometry not associated with a mesh Copying a mesh pattern Smoothing external node positions Enhanced verification options for mesh quality Execution GPGPU accelerated unsymmetric direct solver Configuration file requirement for co simulation execution Improved translation of Abaqus substructure data to MSC ADAMS Sul 5 8 5 9 5 10 6 1 6 2 6 3 6 4 6 5 7 1 72 8 1 9 1 10 1 10 2 10 3 10 4 10 5 10 6 11 1 11 2 11 3 11 4 12 1 12 2 12 3 13 14 15 1 1 Improved coverage and functionality for Nastran translation Element matrix assembly utility Output and visualization Visualization of gravity waves in Abaqus Aqua Visualizing initial strain free adjustments Enhanced diagnostics for nearly incompressible materials and instabilities Visualizing component surfaces for Abaqus Explicit general contact Customizing element orientation for composite output Yield stress output Adjusted or redistributed mass output Section thinning or thickening output User subroutines utilities and plug ins VUEOS User subroutine to define equation of state material model Summary of changes Changes in Abaqus elements Changes in Abaqus options Changes in Abaqus user subroutines Changes in Abaqus output variable identifiers Product Index
34. available for both field and history element output 13 4 OUTPUT AND VISUALIZATION References Abaqus Analysis User s Guide e Abaqus Standard output variable identifiers Section 4 2 1 e Abaqus Explicit output variable identifiers Section 4 2 2 e Classical metal plasticity Section 23 2 1 e Anisotropic yield creep Section 23 2 6 e Johnson Cook plasticity Section 23 2 7 13 7 Adjusted or redistributed mass output Products Abaqus Explicit Abaqus Viewer Benefits You can now request the adjusted or redistributed mass as field element output Description The new output variable MASSADJUST indicates how the mass specified by using mass adjustment for an element set is adjusted or redistributed for each element included in that element set This output variable is available as field output contour plots in the first output frame of the first analysis step References Abaqus Analysis User s Guide e Abaqus Explicit output variable identifiers Section 4 2 2 Abaqus Keywords Reference Guide e MASS ADJUST 13 8 Section thinning or thickening output Products Abaqus Explicit Abaqus Viewer Benefits You can now request section thinning or thickening as field and history element output Description Section thinning or thickening is defined as STH IN 1 st where ST Horig is the original thickness specified on the section definition for shell membrane and plane stress elements
35. blem References Abaqus Analysis User s Guide e Using the Abaqus environment settings Section 3 3 1 e Solid continuum elements Section 28 1 1 13 4 Visualizing component surfaces for Abaqus Explicit general contact Product Abaqus Explicit Benefits You can view component surfaces within the general contact domain for Abaqus Explicit simulations Description Component surfaces associated with the Abaqus Explicit general contact domain are now available as output Each component surface is a set of simply connected faces and each face is only defined within one component surface throughout the entire contact domain These surfaces are defined as internal surfaces and can be viewed using display groups in the Visualization module of Abaqus CAE References Abaqus Analysis User s Guide e Defining general contact interactions in Abaqus Standard Section 36 2 1 e Defining general contact interactions in Abaqus Explicit Section 36 4 1 13 3 OUTPUT AND VISUALIZATION 13 5 Customizing element orientation for composite output Products Abaqus CAE Abaqus Viewer Benefits You can now display element output from composite sections using the material orientation of the entire composite layup rather than the material orientation of one of its individual plies You can also transform field output in your results to display material orientation in the direction of the elements on the individual plies
36. del while retaining any analysis features such as loads or boundary conditions that were defined on the model in Abaqus CAE The geometry of CATIA V5 format Part CATPart and Product CATProduct files can also be imported directly into Abaqus CAE e SolidWorks Associative Interface This add on capability for Abaqus CAE creates a connection between a SolidWorks session and an Abaqus CAE session This connection can be used to transfer model information from SolidWorks to Abaqus CAE Subsequent modifications to the model in SolidWorks can be propagated to the Abaqus CAE model while retaining any analysis features such as loads or boundary conditions that were defined on the model in Abaqus CAE e Pro ENGINEER Associative Interface This add on capability for Abaqus CAE creates a connection between a Pro ENGINEER session and an Abaqus CAE session This connection can be used to transfer model information between Pro ENGINEER and Abaqus CAE Modifications to the model in Pro ENGINEER can be propagated to the Abaqus CAE model without affecting any analysis features such as loads or boundary conditions that were defined on the model in Abaqus CAE and certain geometric modifications can be made in Abaqus CAE and propagated to the model in Pro ENGINEER e Abaqus CAE Associative Interface for NX This add on capability for Abaqus CAE creates a connection between an NX session and an Abaqus CAE session This connection can be used to transfer model
37. e E Less Than 10 Greater Than 160 Aspect Ratio Greater Than 10 E Create element set PoorElements 1 Reselect Defaults Dismiss Figure 11 3 Verify Mesh dialog box 11 4 MESHING Abaqus CAE now also enables you to include shape metrics and size metrics among the tests that are performed on elements as you drag nodes Click Element failure criteria from the prompt area and toggle on the criteria you want to include Abaqus CAE Usage Mesh module Mesh Verify References Abaqus CAE User s Guide e Verifying element quality Section 17 19 1 in the HTML version of this guide e Dragging nodes Section 64 5 3 in the HTML version of this guide 11 5 EXECUTION 12 Execution This chapter discusses commands and utilities for running the Abaqus products It provides an overview of the following enhancements e GPGPU accelerated unsymmetric direct solver Section 12 1 e Configuration file requirement for co simulation execution Section 12 2 e Improved translation of Abaqus substructure data to MSC ADAMS Section 12 3 e Improved coverage and functionality for Nastran translation Section 12 4 e Element matrix assembly utility Section 12 5 12 1 GPGPU accelerated unsymmetric direct solver Product Abaqus Standard Benefits The analysis time for Abaqus Standard analyses that require unsymmetric solution has been reduced
38. e format abaqus toOutput2 translates an Abaqus output database file to the Nastran Output2 file format abaqus tozaero enables you to exchange aeroelastic data between the Abaqus and ZAERO analysis products Other utilities e Additional programs are included with the release They are all invoked through the Abaqus execution procedure the driver The utilities and the commands to invoke these programs are described below abaqus append joins separate results files into a single file abaqus ascfil translates Abaqus results files between ASCII and binary formats which is useful for moving results files between different computer types abaqus cosimulation runs a co simulation using a single command where the analysis job options specify two Abaqus jobs abaqus cse runs the SIMULIA Co Simulation Engine CSE Director process that governs co simulation between Abaqus and third party solvers Typically when performing a co simulation between Abaqus solvers only you are not required to invoke the CSE Director process it is invoked automatically when you run the Abaqus co simulation procedure using abaqus cosimulation abaqus doc accesses the Abaqus documentation collection using a web browser abaqus dymola runs a co simulation between an Abaqus Standard or Abaqus Explicit model and a model exported from Dymola abaqus emloads converts results output from an electromagnetic analysis for use as loads in a subsequent analysis abaqu
39. er s Guide e Defining equations of state in Defining other mechanical models Section 12 9 4 in the HTML version of this guide MATERIALS 6 5 Nonlinear magnetic permeability in Abaqus CAE Product Abaqus CAE Benefits You can now create materials with nonlinear magnetic permeability This option expands the coverage of magnetic properties to include soft magnetic materials Description Magnetic permeability properties are required to complete eddy current and magnetostatic analyses Previously only linear magnetic permeability definitions were supported by Abaqus CAE With this enhancement you can now define nonlinear magnetic permeability material properties To define nonlinear magnetic permeability you create one or more B H curves that define the strength of the magnetic flux density versus the strength of the magnetic field in the material Abaqus CAE Usage Property module Material editor Mechanical Electrical Magnetic Toggle on Specify using nonlinear B H curve References Abaqus Analysis User s Guide e Magnetic permeability Section 26 5 3 Abaqus CAE User s Guide e Defining magnetic permeability Section 12 11 4 in the HTML version of this guide Abaqus Keywords Reference Guide e NONLINEAR BH ELEMENTS 7 Elements This chapter discusses elements available in Abaqus It provides an overview of the following enhancements e New pyramid element Section 7 1 e Electromag
40. ermanent magnets with electromagnetic elements Description Permanent magnetization can be specified for linear isotropic orthotropic or anisotropic magnetic behavior or for nonlinear isotropic magnetic behavior It is specified in terms of the coercivity of the permanent magnet References Abaqus Analysis User s Guide e Magnetic permeability Section 26 5 3 Abaqus Keywords Reference Guide e PERMANENT MAGNETIZATION 6 4 Tabulated equation of state in Abaqus CAE Product Abaqus CAE Benefits You can now create materials with tabulated equations of state linear in energy in Abaqus CAE which increases the coverage of Abaqus product functionality Description This feature provides flexibility in modeling the hydrodynamic response of materials that exhibit sharp transitions in the pressure density relationship such as those induced by phase transformations The material editor for defining tabulated equation of state materials is shown in Figure 6 2 MATERIALS amp Edit Material 8 Name Material 1 Description yd Material Behaviors General Mechanical Thermal Electrical Magnetic Other Eos Type Tabular hd v Suboptions Data fl f2 epsilon_vol Figure 6 2 Defining a tabulated equation of state Abaqus CAE Usage Property module Material editor Mechanical Eos Type Tabular References Abaqus Analysis User s Guide e Equation of state Section 25 2 1 Abaqus CAE Us
41. ew S EMCDA Magnitude and components of the applied volume current density vector mod S TEMP This variable is now available for eddy current analyses and magnetostatic analyses For a time harmonic eddy current analysis this value represents the temperature that 1s used for evaluating the temperature dependent material properties 15 5 SUMMARY OF CHANGES Element section variables new E STHIN Section thinning or thickening is defined as STHIN 1 rn where ST Horig is the original thickness specified on the section definition for shell membrane and plane stress elements Whole element variables mod S EVOL Element volume This variable is now available for eddy current analyses and magnetostatic analyses new S LOADSXFEM Distributed pressure loads applied to the XFEM based crack surface Nodal variables new E STRAINFREE Strain free adjustments to initial positions adjusted position minus unadjusted position Only written to the output database odb file for the original field output frame at zero time 15 6 PRODUCT INDEX l Product Index Abaqus Standard Section 4 1 Efficient subspace iteration algorithm for buckling analysis Section 4 2 The SIM architecture supports coupled structural acoustic eigenmodes Section 4 3 Automatic node selection in the AMS eigensolver Section 4 4 Complex eigensolver enhancements Section 4 6 Prescribed motion in eddy current simulations Section 5 2 Enha
42. ew of the following enhancements e Efficient subspace iteration algorithm for buckling analysis Section 4 1 e The SIM architecture supports coupled structural acoustic eigenmodes Section 4 2 e Automatic node selection in the AMS eigensolver Section 4 3 e Complex eigensolver enhancements Section 4 4 e Solid heat transfer in Abaqus CFD Section 4 5 e Prescribed motion in eddy current simulations Section 4 6 e Steady state analysis in Abaqus CFD Section 4 7 e K omega turbulence model in Abaqus CFD Section 4 8 e Hybrid wall functions in Abaqus CFD Section 4 9 4 1 Efficient subspace iteration algorithm for buckling analysis Product Abaqus Standard Benefits The new implementation of the subspace iteration method offers two significant improvements Previously the number of eigenmodes was restricted by the 2 GB limit imposed on the size of the subspace The new version of the subspace iteration algorithm removes this limit There is also significant improvement in the run time performance In the new implementation the orthogonalization of the dynamic modes which previously dominated the run times has been sped up significantly by using efficient computational techniques Description A new implementation of the subspace iteration algorithm delivers significant performance improvement and eliminates the restriction on the size of the subspace used In addition the tolerance for
43. f elements at which a distributed load is applied nodes of elements with frequency dependent material properties and nodes of elements at which output is requested in the eigenvalue extraction analysis or in the subsequent mode based procedures 4 3 ANALYSIS PROCEDURES References Abaqus Analysis User s Guide e Natural frequency extraction Section 6 3 5 Abaqus Keywords Reference Guide e FREQUENCY 4 4 Complex eigensolver enhancements Product Abaqus Standard Benefits You can extract left complex eigenvectors and request displacement normalization in complex eigenvalue extraction analysis that is based on the SIM architecture Description In complex eigenvalue extraction analysis that is based on the SIM architecture you can now extract the left complex eigenvectors In addition you can request the displacement normalization of eigenvectors although this normalization method is not recommended for large scale analyses because of the computational cost of this operation References Abaqus Analysis User s Guide e Complex eigenvalue extraction Section 6 3 6 Abaqus Keywords Reference Guide e COMPLEX FREQUENCY 4 5 Solid heat transfer in Abaqus CFD Product Abaqus CFD Benefits You can take advantage of Abaqus CFD s high capacity performance and parallel scalability to run uncoupled solid heat transfer simulations Description Uncoupled heat transfer analysis can be used in Abaqus CFD to
44. general non perturbation step the contact constraints are not enforced in the perturbation step For base state contact pressures greater than p the contact constraints are fully enforced in the perturbation step as in past releases of Abaqus Standard Transition between no enforcement and full enforcement occurs for base state contact pressures between py and p References Abaqus Analysis User s Guide e Adjusting contact controls in Abaqus Standard Section 36 3 6 Abaqus Keywords Reference Guide e CONTACT CONTROLS Abaqus Verification Guide e Contact controls Section 1 6 23 10 4 Contact thickness enhancements Product Abaqus Explicit Benefits You may notice more accurate contact response for some Abaqus Explicit models involving beams or shells Description General contact in Abaqus Explicit has the following enhancements related to thickness offsets e Slip increment calculations for friction account for incremental rotation of shell and beam thickness offsets Previously slip increment calculations were based on tangential components of surface node translations alone The effect on the results due to consideration of incremental rotation of thickness offsets for friction is very small in most cases but is significant in some applications Figure 10 1 shows an example in which surface thickness significantly affects slip increment calculations and therefore proper enforcement of sticking conditions
45. he penalty stiffness in the first increment of an analysis Using a reduced penalty stiffness in the early iterations often helps convergence behavior when large portions of the surface come into or out of contact during the first increment Once an approximate solution is found with a reduced penalty stiffness additional iterations with the default penalty stiffness in effect are able to converge to a more accurate solution The intra increment adaptive contact controls are intended for advanced users and will likely undergo changes in subsequent releases of Abaqus Standard References Abaqus Analysis User s Guide e Stabilization for general contact in Abaqus Standard Section 36 2 5 e Adjusting contact controls in Abaqus Standard Section 36 3 6 e Penalty method in Contact constraint enforcement methods in Abaqus Standard Section 38 1 2 10 2 INTERACTIONS 10 3 Contact pressure dependent constraint enforcement in perturbation steps Product Abaqus Standard Benefits You can now relax or completely remove contact constraints on all points in contact i e with a closed status depending on the local base state contact pressure during linear perturbation steps in Abaqus Standard Description Both normal and tangential constraints are affected Two pressure coefficients py and p are provided to control the feature For contact pressures less than pp in the base state as established in the prior
46. hicknesses to oppose the net moment associated with the frictional force couple Figure 10 2 shows an example of this in the context of the same shell on roller example as Figure 10 1 The applied nodal moment shown in Figure 10 2 cancels the moment of the associated frictional force couple such that the net force and moment associated with the frictional constraint are zero 10 4 INTERACTIONS Moment associated with friction and shell thickness offset on reference node of shell Shell thickness offset Equal and opposite frictional forces on reference node of shell and corresponding point on roller Figure 10 2 Example with applied nodal moment associated with frictional constraint References Abaqus Analysis User s Guide e Contact controls for general contact in Abaqus Explicit Section 36 4 5 e Frictional behavior Section 37 1 5 Abaqus Keywords Reference Guide e CONTACT CONTROLS ASSIGNMENT e FRICTION 10 5 Temperature and field variable dependence of the friction coefficient Product Abaqus Explicit Benefits You can define the friction coefficient as a function of temperature and field variables with the general contact algorithm in Abaqus Explicit 10 5 INTERACTIONS Description The friction coefficient for the Coulomb friction model can now depend on slip rate contact pressure temperature and field variables Previously dependence of the friction coefficient on temperature
47. ing example 5 7 Parallel enhancement of SPH analysis Product Abaqus Explicit Benefits Smoothed particle hydrodynamic SPH simulations run more efficiently due to domain decomposition of the SPH computations Description Computations associated with PC3D elements and contact between SPH particles and finite element based surfaces are now implemented in domain parallel enabling better parallel scaling if multiple CPUs are used An evolving domain decomposition is used for SPH analysis to avoid large spatial overlap among SPH domains and therefore to maintain good parallel scaling after large relative motions of SPH particles The speedup for multiple CPU runs of the bottle drop test see Impact of a water filled bottle Section 2 3 2 of the Abaqus Example Problems Guide is plotted in Figure 5 2 It shows that the speedup ANALYSIS TECHNIQUES for a two CPU run is 1 79 and the performance efficiency is 0 89 for a four CPU run the speedup is 2 91 and the performance efficiency is 0 73 4 BA 4 2 e caii O ee c gt l o et y 2 Br J w7 a or mn a 1 ae 0 T T 1 2 3 4 Number of CPUs Figure 5 2 Speedup of parallel SPH runs References Abaqus Analysis User s Guide e Smoothed particle hydrodynamics Section 15 2 1 Abaqus Example Problems Guide e Impact of a water filled bottle Section 2 3 2 5 8 Co simulation between electromagnetic and thermal or stress analysis procedures Product Aba
48. ining postprocessing and visualizing results from Abaqus analyses e Chapter 14 User subroutines utilities and plug ins additional user programs that can be run with Abaqus Each entry in these chapters clearly indicates the Abaqus product or products to which the feature applies and includes cross references to more detailed information Chapter 15 Summary of changes summarizes in tabular format the changes to Abaqus elements keyword options user subroutines and output variable identifiers 1 1 Key features of Abaqus 6 13 This section provides a list of the most significant new capabilities and enhancements available in Abaqus 6 13 refer to the table of contents for a complete list of new features e Performance improvements Subspace iteration algorithm Automatic node selection in the AMS eigensolver GPGPU support for unsymmetric solver 1 1 El INTRODUCTION TO Abaqus 6 13 e Particle methods Discrete element method SPH analysis in parallel e Electromagnetic analysis Co simulation Permanent magnetization EMC3D6 prism element Nonlinear magnetic permeability in Abaqus CAE e Fluid analysis Steady state analysis SST k w turbulence model Hybrid wall functions e Heat transfer Thermal matrix output Uncoupled heat transfer in Abaqus CFD e Crack modeling and propagation XFEM enhancements Abaqus CAE support for VCCT in Abaqus Standard models e C
49. inition in Abaqus Standard Abaqus Explicit and Abaqus CFD part and assembly definition in Abaqus CAE and importing models to Abaqus CAE It provides an overview of the following enhancements e Enhanced import of parts in STEP format Section 3 1 e Enhanced control for creation of geometry from orphan elements Section 3 2 e Model instances in Abaqus CAE Section 3 3 e Displaying material stacking directions Section 3 4 e Support for modeling crack propagation using the virtual crack closure technique Section 3 5 e Assigning sections to element sets Section 3 6 3 1 Enhanced import of parts in STEP format Product Abaqus CAE Benefits When you import one or more parts from a STEP format file into Abaqus CAE you can now retain the part names specified in the source file as the names of the imported parts you create in Abaqus CAE Description The Create Part from STEP File dialog box now enables you to read the part name or names during import of a STEP format file and to use those names for the imported parts you create in the model database in Abaqus CAE Figure 3 1 shows the revised dialog box which also enables you to specify a part name for all imported parts Abaqus CAE Usage Part module File Import Part File Filter STP or STEP Use part name from file Reference Abaqus CAE User s Guide e Importing a part from a STEP format file Section 10 7 10 in the HTML versio
50. its The ability to create an element set expands the functionality of the volume fraction tool Description The volume fraction tool is a subset of the Discrete Field toolset in Abaqus CAE The tool compares two intersecting part instances a meshed Eulerian part and an arbitrary reference part to determine the region of overlap between them A discrete field is created that assigns each element in the Eulerian part a volume fraction based on the percentage of space within the element also occupied by the reference part instance You can subsequently use this discrete field to create an Eulerian material assignment that conforms to the geometry of the reference part When using the volume fraction tool you can now create a set of all elements connected to elements with nonzero volume fractions in the discrete field as shown in Figure 8 1 Figure 8 1 Volume Fraction Tool Eg Name DiscField 1 Description Parameters Eulerian instance Part 2 1 Edit 15 Reference instance Part 1 1 Edit o Accuracy Low Medium High Material location Inside reference instance Outside reference instance Scale factor O lt f lt 1 1 Note An unmeshed reference part instance will generate a warning when the input file is written Set Creation E Node set NodeSet 1 V Element set ElemSet 1 OK Creating an element set using the volume fraction tool PRESCRIBED CONDITIONS Abaqus CAE Usage Inte
51. material stacking directions Section 3 5 Support for modeling crack propagation using the virtual crack closure technique Section 3 6 Assigning sections to element sets Section 6 4 Tabulated equation of state in Abaqus CAE Section 6 5 Nonlinear magnetic permeability in Abaqus CAE Section 8 1 Creating element sets using the volume fraction tool Section 11 1 Section 11 2 Section 11 3 Section 11 4 Section 12 2 Section 13 5 Querying for geometry not associated with a mesh Copying a mesh pattern Smoothing external node positions Enhanced verification options for mesh quality Configuration file requirement for co simulation execution Customizing element orientation for composite output Abaqus Viewer Section 5 6 Section 13 5 Section 13 6 Section 13 7 Section 13 8 PRODUCT INDEX Discrete element method Customizing element orientation for composite output Yield stress output Adjusted or redistributed mass output Section thinning or thickening output Abaqus AMS Section 5 4 Substructure generation using the AMS eigensolver Abaqus Aqua Section 13 1 Visualization of gravity waves in Abaqus Aqua About SIMULIA SIMULIA is the Dassault Systemes brand that delivers a scalable portfolio of Realistic Simulation applications including Abaqus for unified Finite Element Analysis and multiphysics simulation Isight for design exploration and optimization and SLM for managing simulation data processes and intellectual pr
52. mixed interface substructure using the AMS eigensolver significantly improves the performance of a substructure generation procedure This new algorithm allows for partial recovery of eigenmodes at the user defined node set which allows you to avoid computationally expensive full eigenmodes recovery and to reduce the overall data storage requirement for substructure generation In addition the performance of conventional substructure generation for free interface or mixed interface substructures is improved Description A new fast substructure generation capability using the AMS eigensolver was first introduced in Abaqus 6 12 for fixed interface substructures Craig Bampton substructures In Abaqus 6 13 the new fast substructure generation capability also supports the generation of free interface substructures Craig Chang substructures general mixed interface substructures and substructures with partially retained nodes In ANALYSIS TECHNIQUES addition the performance of conventional free mixed interface substructure generation is improved by the enhanced orthogonalization for dynamic mode computation Table 5 1 illustrates the improved substructure generation performance which includes the AMS frequency extraction step and the subsequent substructure generation step on a system with Intel Westmere processors 12 cores and 96 GB physical memory for three industrial models e Model 1 is a 13 million degree of freedom powertrain model with
53. mod S mod S mod C mod S COMPLEX FREQUENCY Use the new LEFT EIGENVECTORS RIGHT EIGENVECTORS and NORMALIZATION parameters to extract left and right complex eigenvectors and to request displacement normalization in a complex eigenvalue extraction analysis COMPOSITE MODAL DAMPING Specify composite modal damping for modal analyses based on the SIM architecture CONTACT CONTROLS Use the new PRESSURE DEPENDENT PERTURBATION parameter to relax or remove both normal and tangential contact constraints with low pressure The STIFFNESS SCALE FACTOR parameter can now take the value USER ADAPTIVE to adjust the contact stiffness so that it is low at the start of an increment to improve the convergence and high at the end of the increment to improve the solution accuracy In addition the STABILIZE parameter can now take the value USER ADAPTIVE to adjust the contact damping coefficient so that it is high at the start of an increment to improve the convergence and low at the end of the increment to improve the solution accuracy CONTACT CONTROLS ASSIGNMENT Use the new SEEDING parameter to control how the contact seeds are created on Lagrangian surfaces during a coupled Eulerian Lagrangian analysis CONTACT FORMULATION Use the new EDGE TO EDGE setting for the TYPE parameter along with the FORMULATION parameter to control usage of edge to edge beam to beam contact formulations in Abaqus Standard Use the new FORMULATION par
54. mplicit approach for mesh smoothing avoids extra memory allocation and improves performance for large deformation analyses involving moving boundaries or deforming geometries Description Similar to the explicit approach used in Abaqus CFD the mesh motion is governed by the linear elasticity equations The algorithm is similar to the static stress analysis procedure in Abaqus Standard To avoid extra memory allocation for solving the linear elasticity equations the matrix free iteration strategy is used The implicit approach is very useful in problems where large deformation might occur due to the mesh motion References Abaqus Analysis User s Guide e Incompressible fluid dynamic analysis Section 6 6 2 e Commonly used control parameters Section 7 2 2 Abaqus Keywords Reference Guide e CONTROLS 5 1 ANALYSIS TECHNIQUES 5 2 Enhancements to the XFEM based crack propagation capability Product Abaqus Standard Benefits The extended finite element method XFEM allows you to model discontinuities such as cracks along an arbitrary solution dependent path during an analysis This method can now be extended to support the application of distributed pressure loads to the cracked element surfaces which makes the analysis more realistic To reduce mesh dependence you can specify where the stress strain values are used to determine if the crack propagation criterion is satisfied Description The extended finite eleme
55. n Section 3 2 4 e Preparing an Abaqus analysis for co simulation Section 17 2 1 Abaqus Keywords Reference Guide e CO SIMULATION e CO SIMULATION CONTROLS Abaqus Example Problems Guide e Conjugate heat transfer analysis of a component mounted electronic circuit board Section 6 1 1 12 3 Improved translation of Abaqus substructure data to MSC ADAMS Product Abaqus Standard Benefits The abaqus adams translator now offers complete coverage of substructure functionality and improved translation over previous releases This execution procedure which was previously available only with the Abaqus Interface for MSC ADAMS is now included as a component of Abaqus Standard Description The abaqus adams execution procedure can now translate all functionality in an Abaqus substructure into modal neutral mn file format including translation of eigensolver data from a SIM database Translating substructure data into mn format enables you to account for flexibility in a component during a dynamic analysis in MSC ADAMS References Abaqus Analysis User s Guide e Translating Abaqus data to msc adams modal neutral files Section 3 2 34 Abaqus Example Problems Guide e Translating Abaqus data to modal neutral file format for analysis in MSC ADAMS Section 15 1 7 12 4 Improved coverage and functionality for Nastran translation Product Abaqus Standard Benefits Nastran translation is enhanced to provide co
56. n of this guide 3 2 Enhanced control for creation of geometry from orphan elements Product Abaqus CAE Benefits When you use orphan element faces to create geometric faces you can now specify the stitch tolerance and the tolerance value for surface fitting as you create the geometric faces You can also defer all stitching until after all geometric faces have been created These enhancements streamline the process of creating geometry and in turn parts from orphan mesh parts 3 1 MODELING Name Repair Name Part Filter 9 Import all parts 0 Create individual parts Combine into single part C Retain intersecting boundaries f n eages using tolerance Import part number a Figure 3 1 Revised Create Part from STEP File dialog box Description The Face from geometry geometry editing functionality now enables you to control the stitch tolerance and the tolerance for fitting of analytic surfaces as you create geometric faces from orphan elements Figure 3 2 shows the new options as they appear in Abaqus CAE Race From Element Faces Options ur z a on Options Stitch with tolerance Fit analytic surfaces with tolerance Figure 3 2 New geometry editing options 3 2 MODELING If you defer stitching you can still use the geometry editing tools to edit the newly created features and to stitch edges Deferring most or all of the stitching until late in the modeling
57. ncements to the XFEM based crack propagation capability Section 5 3 Enhancements for import analysis Section 5 4 Substructure generation using the AMS eigensolver Section 5 5 Substructuring enhancements Section 5 8 Co simulation between electromagnetic and thermal or stress analysis procedures Section 5 9 Global and element by element matrix generation in heat transfer analyses Section 5 10 Matrix input capability enhancements Section 6 1 Composite modal damping Section 6 2 Parallel rheological framework Section 6 3 Permanent magnetization Section 7 2 Electromagnetic prism element Section 9 1 Enhancements to embedded elements Section 10 1 Section 10 2 Section 10 3 Section 12 1 Section 12 2 Section 12 3 Section 12 4 Section 12 5 Section 13 3 Section 13 6 Beam to surface and beam to beam contact Enhanced convergence behavior for Abaqus Standard contact analyses Contact pressure dependent constraint enforcement in perturbation steps GPGPU accelerated unsymmetric direct solver Configuration file requirement for co simulation execution Improved translation of Abaqus substructure data to MSC ADAMS Improved coverage and functionality for Nastran translation Element matrix assembly utility Enhanced diagnostics for nearly incompressible materials and instabilities Yield stress output Abaqus Explicit Section 5 3 Enhancements for import analysis Section 5 6 Discrete element method Section 5 7 Parallel enhancement of SPH analy
58. netic prism element Section 7 2 7 1 New pyramid element Product Abaqus CFD Benefits The pyramid element is useful to transition between brick elements and tetrahedra elements during mesh generation Description The new 5 node pyramid element FC3D5 can be used with either a fluid or solid property section in Abaqus CFD The active degrees of freedom depend on the analysis procedure and options used such as the energy equation and turbulence model References Abaqus Analysis User s Guide e Incompressible fluid dynamic analysis Section 6 6 2 e Active degrees of freedom in Boundary conditions in Abaqus CFD Section 34 3 2 7 2 Electromagnetic prism element Product Abaqus Standard Benefits The electromagnetic prism element can be used to mesh the skin region in a conductor and helps to transition from brick to tetrahedra and from tetrahedra to tetrahedra elements Description The 6 node prism element EMC3D6 can be used with a solid section definition Reference Abaqus Analysis User s Guide e Three dimensional solid element library Section 28 1 4 8 Prescribed conditions PRESCRIBED CONDITIONS This chapter discusses loads boundary conditions and predefined fields It provides an overview of the following enhancement e Creating element sets using the volume fraction tool Section 8 1 8 1 Product Abaqus CAE Creating element sets using the volume fraction tool Benef
59. no substructure matrix recovery e Model 2 is a4 5 million degree of freedom powertrain model with selective substructure matrix recovery e Model 3 is a 10 million degree of freedom automotive vehicle body model with full substructure matrix recovery Table 5 1 Performance improvement of free interface substructure generation procedure due to a new fast substructure generation capability of the AMS eigensolver Number ppadue Le Abaqus 6 13 Elapsed Time Degrees of Number Elapsed Time Hina of Retained hh mm Sun ae Freedom Degrees ee sis g Modes Conventional Enhanced AMS based Millions of Conventional Freedom Model 1 13 0 1188 150 43 10 34 54 2 43 Model 2 4 5 4488 154 10 13 7 59 0 13 Model 3 10 0 336 571 45 26 5 52 1 30 The heading AMS based indicates the new fast substructure generation functionality using the AMS eigensolver and Enhanced Conventional indicates the conventional substructure generation functionality with enhanced orthogonalization in the substructure generation step As shown in the table a significant performance improvement can be achieved by the fast substructure generation functionality compared to the conventional and enhanced conventional approaches The level of performance improvement varies depending on the number of dynamic modes As the number of dynamic modes increases more performance improvement can be achieved in Abaqus 6 13 with both new approaches Due to
60. nt method allows you to model crack growth without remeshing the crack surfaces since it does not require the mesh to match the geometry of the crack As a crack initiates and propagates through the model a crack surface representing both facets of the cracked elements is generated on those enriched elements that are intersected by a crack during the analysis Distributed pressure loads can now be applied to the crack surface You can specify if the stress strain values at the element centroid at the crack tip or the combination of both locations are used to measure the crack propagation criterion References Abaqus Analysis User s Guide e Modeling discontinuities as an enriched feature using the extended finite element method Section 10 7 1 Abaqus Keywords Reference Guide e DAMAGE INITIATION e DSLOAD e ENRICHMENT e SURFACE Abaqus Benchmarks Guide e Crack propagation of a single edge notch simulated using XFEM Section 1 19 1 e Crack propagation in a plate with a hole simulated using XFEM Section 1 19 2 5 3 Enhancements for import analysis Products Abaqus Standard Abaqus Explicit Benefits You can use the import capability to transfer desired results and model information from an Abaqus Standard or Abaqus Explicit analysis to a new Abaqus Standard or Abaqus Explicit analysis where additional model definitions can be specified before the analysis is continued Mass and rotary inertia elements ANALYSIS TE
61. odel VISCOELASTIC The LAW parameter can now take the values BERGSTROM BOYCE and USER to choose a Bergstrom Boyce law or to input the creep law using user subroutine 15 4 SUMMARY OF CHANGES UCREEPNETWORK in an Abaqus Standard analysis Use the new PROPERTIES parameter in an Abaqus Standard analysis to set the number of property values needed as data in user subroutine UCREEPNETWORK 15 3 Changes in Abaqus user subroutines This section summarizes the changes and the additions that have been made to user subroutines that can be used in an Abaqus model new S UCREEPNETWORK User subroutine to define time dependent behavior creep for models defined within the parallel rheological framework new S UTRS User subroutine to define a reduced time shift function for a viscoelastic material new E VUEOS User subroutine to define equation of state material model 15 4 Changes in Abaqus output variable identifiers This section summarizes the changes and the additions that have been made to output variable identifiers used in Abaqus Element integration point variables new E MASSADJUST Adjusted or redistributed mass in each element that is included in the element sets used with mass adjustment This output is available only in the first output frame of the first analysis step new S E YIELDS Yield stress o models 0 available for Mises Johnson Cook and Hill plasticity material Element centroidal variables n
62. on coefficient Section 10 5 e User defined tracking thickness for user subroutine VUINTER Section 10 6 10 1 Beam to surface and beam to beam contact Product Abaqus Standard Benefits You can now define more realistic and automated contact modeling with general contact in Abaqus Standard Description Beam to surface and beam to beam contact can now be modeled with general contact in Abaqus Standard These beam related contact formulations also work with surfaces on truss elements Beam to surface contact is a special case of the edge to surface contact formulation which was already applicable to feature edges of solid and shell like surfaces in the previous release Beam to beam contact uses new contact formulations Contact inclusion and contact exclusion specifications control which beam and truss elements are considered by general contact Feature edge criteria that control which solid and shell edges are considered by general contact have no bearing on beams and trusses References Abaqus Analysis User s Guide e Defining general contact interactions in Abaqus Standard Section 36 2 1 Abaqus Keywords Reference Guide e CONTACT e CONTACT FORMULATION INTERACTIONS 10 2 Enhanced convergence behavior for Abaqus Standard contact analyses Product Abaqus Standard Benefits You can enhance convergence behavior for Abaqus Standard contact analyses without degrading accuracy Description Intra increment adap
63. ontact enhancements Contact modeling for beams and shells Convergence behavior for Abaqus Standard Contact calculations for thick shells beams Friction coefficient dependencies User defined tracking thickness e Linear dynamics Composite modal damping e Materials Enhanced diagnostics for nearly incompressible materials Parallel rheological framework User defined EOS Tabulated EOS in Abaqus CAE INTRODUCTION TO Abaqus 6 13 Abaqus CAE modeling and usability Model instances Copying a mesh pattern Linking viewports Persistent color mapping Visualization Gravity waves in Abaqus Aqua The remaining chapters in this guide provide details on these and other new features of Abaqus 6 13 In addition to the enhancements listed here most of the known bugs in Abaqus 6 12 are corrected 1 2 Abaqus products Individual components of the Abaqus suite are described in this section Analysis Abaqus Standard This general purpose analysis product can solve a wide range of linear and nonlinear problems involving the static dynamic thermal electrical and electromagnetic response of components Abaqus Standard includes all analysis capabilities except those provided in the Abaqus Explicit and Abaqus CFD programs and the add on analysis functionality described below Abaqus Explicit This product provides nonlinear transient dynamic analysis of solids and structures using explicit
64. operty SIMULIA s realistic simulation applications are used as part of key business practices by world leading manufacturing and research organizations to explore physical behavior discover innovative solutions and improve product performance About Dassault Systemes Dassault Systemes the 3DEXPERIENCE Company provides business and people with virtual universes to imagine sustainable innovations Its world leading solutions transform the way products are designed produced and supported Dassault Syst mes collaborative solutions foster social innovation expanding possibilities for the virtual world to improve the real world The group brings value to over 150 000 customers of all sizes in all industries in more than 80 countries www 3ds com Abaqus the 3DS logo SIMULIA CATIA Solidworks DELMIA ENOVIA 3DVIA Isight and Unified FEA are trademarks or registered trademarks of Dassault Systemes or its subsidiaries in the US and or other countries Other company product and service names may be trademarks or service marks of their respective owners Dassault Systemes 2013 2 DASSAULT SUSTEMES
65. or a part of the model in the heat transfer analysis You can choose to write the matrices in either element by element or assembled form to the output SIM document This feature is supported for continuum heat transfer elements and thermal contact elements References Abaqus Analysis User s Guide e Element matrix assembly utility Section 3 2 24 e Generating thermal matrices Section 10 3 2 Abaqus Keywords Reference Guide e ELEMENT OPERATOR OUTPUT 5 10 Matrix input capability enhancements Product Abaqus Standard ANALYSIS TECHNIQUES Benefits You can now restart an Abaqus Standard analysis using matrices or continue an Abaqus Standard analysis using matrices after a data check analysis The use of matrices containing Lagrange multiplier degrees of freedom is now supported Description You can now restart an Abaqus Standard analysis using matrices In addition you can continue an Abaqus Standard analysis using matrices after running the analysis for data checking starting from the point at which the previous data check analysis run ended Matrices containing Lagrange multiplier degrees of freedom can be used in Abaqus Standard if matrix data are included in a model from the SIM database generated by Abaqus Standard By default using the matrix data in text format for matrices containing Lagrange multiplier degrees of freedom or other internal degrees of freedom is not supported because this feature can produce inaccu
66. qus Standard Benefits Co simulation between an electromagnetic analysis and a thermal or stress analysis is now supported ANALYSIS TECHNIQUES Description Direct coupling between an electromagnetic and a thermal or a stress analysis procedure is now supported through the co simulation capability This capability allows simulation of problems such as induction heating where the Joule heat output from an electromagnetic analysis drives a thermal analysis while the temperature output from the thermal analysis affects the electromagnetic fields through temperature dependent material properties Analysis involving coupling between an electromagnetic and a stress analysis procedure is also supported but limited to a one way transfer of results magnetic body forces from the electromagnetic to the stress analysis Reference Abaqus Analysis User s Guide e Electromagnetic to structural and electromagnetic to thermal co simulation Section 17 3 3 5 9 Global and element by element matrix generation in heat transfer analyses Product Abaqus Standard Benefits You can now request thermal conductivity heat capacity and heat flux operator output in an Abaqus Standard uncoupled heat transfer analysis These operators can be used to construct an abstract representation of a finite element heat transfer model for use with techniques such as model order reduction Description You can request thermal matrix output for the whole model or f
67. r geometry not associated with a mesh Section 11 1 e Copying a mesh pattern Section 11 2 e Smoothing external node positions Section 11 3 e Enhanced verification options for mesh quality Section 11 4 11 1 Querying for geometry not associated with a mesh Product Abaqus CAE Benefits You can now query for the cells faces edges or vertices in your part or model that are not associated with a mesh This enhancement makes it easier to complete meshing your model before you submit an analysis Description The Query Unassociated Geometry query enables you to determine which components in your part or model are not associated with a mesh You can run the query for individual categories of geometry such as cells faces edges or vertices Figure 11 1 shows the Query Unassociated Geometry dialog box You can save the unassociated geometry to a set The query does not consider regions that do not require a mesh such as display bodies and analytical rigid surfaces Query Unassociated Geometry ie Edges Vertices V Create Set Unassociated 1 Highlight Cancel Figure 11 1 Query Unassociated Geometry dialog box Abaqus CAE Usage Mesh module Tools Query Unassociated geometry MESHING Reference Abaqus CAE User s Guide e Obtaining mesh information and statistics Section 17 19 in the HTML version of this guide 11 2 Copying a mesh pattern Product Abaqus
68. raction module or Load module Tools Discrete Field Volume Fraction Tool Reference Abaqus CAE User s Guide e Creating discrete fields for material volume fractions Section 63 4 in the HTML version of this guide CONSTRAINTS 9 Constraints This chapter discusses kinematic constraints It provides an overview of the following enhancement e Enhancements to embedded elements Section 9 1 9 1 Enhancements to embedded elements Products Abaqus Standard Abaqus Explicit Benefits Embedded elements can now be embedded partially in the host element set This enhancement obviates the need to create element sets that exactly correspond to the embedded part of the mesh Description You can now choose whether to fully or partially embed the elements References Abaqus Analysis User s Guide e Embedded elements Section 35 4 1 Abaqus Keywords Reference Guide e EMBEDDED ELEMENT 9 1 INTERACTIONS 10 Interactions This chapter discusses features related to contact and interaction modeling It provides an overview of the following enhancements e Beam to surface and beam to beam contact Section 10 1 e Enhanced convergence behavior for Abaqus Standard contact analyses Section 10 2 e Contact pressure dependent constraint enforcement in perturbation steps Section 10 3 e Contact thickness enhancements Section 10 4 e Temperature and field variable dependence of the fricti
69. rate results The use of such matrices in text format can be allowed for some special cases however this feature should be used with caution References Abaqus Analysis User s Guide e Continuation of output upon restart in Restarting an analysis Section 9 1 1 e Introduction in Generating structural matrices Section 10 3 1 Abaqus Keywords Reference Guide e MATRIX ASSEMBLE e MATRIX INPUT MATERIALS 6 Materials This chapter discusses new material models or changes to existing material models It provides an overview of the following enhancements e Composite modal damping Section 6 1 e Parallel rheological framework Section 6 2 e Permanent magnetization Section 6 3 e Tabulated equation of state in Abaqus CAE Section 6 4 e Nonlinear magnetic permeability in Abaqus CAE Section 6 5 6 1 Composite modal damping Product Abaqus Standard Benefits Previously unavailable for analyses based on the SIM architecture composite modal damping can now be included in SIM based analyses that use the Lanczos eigensolver Description Composite modal damping is available for eigenvalue extraction that uses the SIM based Lanczos eigensolver You specify composite modal damping in the frequency extraction step definition which is in contrast to analyses using the traditional architecture where you specify composite modal damping in the material definition In SIM based analyse
70. rchitecture for large scale modal analyses and subsequent modal procedures can use these modes The coupled structural acoustic modes are supported in the following modal procedures that use the SIM architecture 4 2 ANALYSIS PROCEDURES Lanczos eigenvalue extraction complex eigenvalue extraction mode based steady state dynamic analysis and subspace based steady state dynamic analysis References Abaqus Analysis User s Guide Natural frequency extraction Section 6 3 5 Abaqus Keywords Reference Guide COMPLEX FREQUENCY FREQUENCY STEADY STATE DYNAMICS Abaqus Theory Guide 4 3 Coupled acoustic structural medium analysis Section 2 9 1 Automatic node selection in the AMS eigensolver Product Abaqus Standard Benefits Abaqus Standard can automatically identify all the nodes that are needed in the selective recovery node set Description To improve performance and reduce the amount of stored data for large models it is recommended that you request eigenvectors only at specified nodes however identifying all of the required nodes can be cumbersome Now Abaqus Standard can automatically select all the necessary nodes as follows nodes at which a concentrated load is applied in the subsequent mode based procedures nodes at which output is requested in the eigenvalue extraction analysis or in the subsequent mode based procedures nodes at which residual vectors are requested nodes o
71. s encrypt creates an encoded password protected version of an Abaqus input file while abaqus decrypt converts an encrypted file back into its original unencoded format abaqus fetch extracts example input files from the libraries included with the release abaqus findkeyword provides a list of sample problems that use the specified Abaqus options This utility will help users find examples of features they may be using for the first time abaqus free converts all fixed format data in an input file to free format abaqus licensing provides management and monitoring tools for FLEXnet and Dassault Systemes DS licensing abaqus make compiles and links user written postprocessing programs for Abaqus and creates user defined libraries of Abaqus Standard and Abaqus Explicit user subroutines INTRODUCTION TO Abaqus 6 13 abaqus mtxasm assembles element matrices contained in a SIM document and optionally writes the assembled matrices to text files abaqus networkDBConnector creates a connection to a network ODB server that can be used to access a remote output database abaqus restartjoin appends an output database file produced by a restart analysis of a model to the output database produced by the original analysis of that model abaqus odbcombine combines the results data in two or more Abaqus output database files into a single output database file abaqus odbreport creates organized reports of output database information in text HTML
72. s that use the Lanczos eigensolver you can calculate mass proportional and stiffness proportional composite modal damping for analyses that use the traditional architecture only mass proportional composite modal damping is available You can calculate the fraction of critical damping per eigenmode and assign different damping values to different elements or elements sets You can also assign mass proportional and stiffness proportional critical damping fractions to both mass and stiffness matrix input The fraction of critical damping per eigenmode is output along with the eigenvalue table in the data dat file The calculated damping values per each eigenmode can be applied and scaled as diagonal damping in modal analyses in Abaqus Standard References Abaqus Analysis User s Guide e Dynamic analysis procedures overview Section 6 3 1 Abaqus Keywords Reference Guide e COMPOSITE MODAL DAMPING e MODAL DAMPING 6 1 MATERIALS 6 2 Parallel rheological framework Products Abaqus Standard Abaqus Explicit Benefits You can model nonlinear viscoelasticity permanent set and Mullins effect using the new parallel rheological framework Description The parallel rheological framework allows you to model the response of materials subjected to large strains that exhibit nonlinear time dependent behaviors such as polymers accurately An example of a model defined within this framework is depicted in Figure 6 1 The model consis
73. sis Section 6 2 Parallel rheological framework Section 9 1 Enhancements to embedded elements Section 10 4 Contact thickness enhancements PRODUCT INDEX Section 10 5 Section 10 6 Section 12 2 Section 13 2 Section 13 4 Section 13 6 Section 13 7 Section 13 8 Section 14 1 Temperature and field variable dependence of the friction coefficient User defined tracking thickness for user subroutine VUINTER Configuration file requirement for co simulation execution Visualizing initial strain free adjustments Visualizing component surfaces for Abaqus Explicit general contact Yield stress output Adjusted or redistributed mass output Section thinning or thickening output VUEOS User subroutine to define equation of state material model Abaqus CFD Section 4 5 Solid heat transfer in Abaqus CFD Section 4 7 Steady state analysis in Abaqus CFD Section 4 8 K omega turbulence model in Abaqus CFD Section 4 9 Hybrid wall functions in Abaqus CFD Section 5 1 New approach for mesh smoothing Section 7 1 New pyramid element Section 12 2 Configuration file requirement for co simulation execution Abaqus CAE Section 2 1 Persistent color mapping Section 2 2 Viewing boundary conditions in the Visualization module Section 2 3 Enhanced viewport linkage Section 3 1 Enhanced import of parts in STEP format Section 3 2 Enhanced control for creation of geometry from orphan elements Section 3 3 Model instances in Abaqus CAE Section 3 4 Displaying
74. tallurgical mining and other industries and is well suited for particle mixing applications The discrete element method is an intuitive method in which discrete particles collide with each other and with other surfaces during an explicit dynamic simulation Typically each DEM particle represents a separate grain tablet shot peen etc For example Figure 5 1 shows a sequence of deformed plots that represent the particle response as two augers turn in a particle mixing application The discrete element method is not applicable to situations in which individual particles undergo complex deformation You can display output from a DEM analysis in the Visualization module of Abaqus CAE by toggling on the Show discrete particle elements entity display option When display of discrete particle elements is enabled discrete particle elements are displayed for all output databases in your session Abaqus CAE Usage Visualization module View ODB Options Entity display tabbed page Show discrete particle elements References Abaqus Analysis User s Guide e Discrete element method Section 15 1 1 Abaqus CAE User s Guide e Controlling the display of model entities Section 55 10 in the HTML version of this guide Abaqus Keywords Reference Guide e DISCRETE SECTION Abaqus Example Problems Guide e Mixing of granular media in a drum mixer Section 13 1 1 ANALYSIS TECHNIQUES 4 seconds Figure 5 1 DEM particle mix
75. tance Section 13 10 3 in the HTML version of this guide 3 4 MODELING 3 4 Displaying material stacking directions Product Abaqus CAE Benefits You can now view the material stacking directions while assigning material orientations Description Material stacking directions for solid and continuum shell elements are now visible while you edit the material orientation in the Property module The material directions are displayed as white arrows on the elements of the selected regions as shown in Figure 3 4 Figure 3 4 Material stacking directions Note The selected regions must be meshed for Abaqus CAE to display a stack direction Abaqus CAE Usage Property module Assign Material Orientation Reference Abaqus CAE User s Guide e Assigning a material orientation or rebar reference orientation Section 12 15 4 in the HTML version of this guide 3 5 Support for modeling crack propagation using the virtual crack closure technique Product Abaqus CAE Benefits You can now use Abaqus CAE to model crack propagation with Abaqus Standard using the virtual crack closure technique VCCT 3 5 MODELING Description You can use the virtual crack closure technique VCCT to study the initiation and propagation of a crack along a known crack surface Abaqus CAE supports modeling crack propagation using VCCT only for Abaqus Standard models three dimensional solid and shell models and two dimensional planar and
76. tation may be reproduced or distributed in any form without prior written permission of Dassault Syst mes or its subsidiary The Abaqus Software is a product of Dassault Systemes Simulia Corp Providence RI USA Dassault Syst mes 2013 Abaqus the 3DS logo SIMULIA CATIA and Unified FEA are trademarks or registered trademarks of Dassault Syst mes or its subsidiaries in the United States and or other countries Other company product and service names may be trademarks or service marks of their respective owners For additional information concerning trademarks copyrights and licenses see the Legal Notices in the Abaqus 6 13 Installation and Licensing Guide Contents 1 Introduction to Abaqus 6 13 Key features of Abaqus 6 13 Abaqus products Changes in interpretation of input data 2 General enhancements Persistent color mapping Viewing boundary conditions in the Visualization module Enhanced viewport linkage 3 Modeling Enhanced import of parts in STEP format Enhanced control for creation of geometry from orphan elements Model instances in Abaqus CAE Displaying material stacking directions Support for modeling crack propagation using the virtual crack closure technique Assigning sections to element sets 4 Analysis procedures Efficient subspace iteration algorithm for buckling analysis The SIM architecture supports coupled structural acoustic eigenmodes Automatic node selection in the AMS eigensolver Comple
77. the changes in the order of the system of equations regarding retained nodes it is possible to observe slight differences in the number of eigenmodes extracted by AMS in Abaqus 6 12 versus Abaqus 6 13 These differences are expected since AMS eigenmodes close to the user specified maximum frequency are generally less accurate and more sensitive to perturbations e g changes in the order of the system of equations or parallel execution of the element operator generation procedure However the substructure usage level results of the subsequent modal dynamic procedures are very close to the results in Abaqus 6 12 and previous releases The new fast substructure generation capability does not support the following features the conventional algorithm is used for these cases ANALYSIS TECHNIQUES e Gravity load and substructure load cases e Coupled acoustic structural substructures e Unsymmetric substructures References Abaqus Analysis User s Guide e Natural frequency extraction Section 6 3 5 e Defining substructures Section 10 1 2 Abaqus Keywords Reference Guide e FREQUENCY e SUBSTRUCTURE GENERATE 5 5 Substructuring enhancements Product Abaqus Standard Benefits Parallel execution of element operations through MPI based parallelization is available for analyses using substructures In addition you can now specify boundary and surface impedances or nonreflective boundaries for coupled acoustic structural substruc
78. tion module Results Tree Model Databases model name select boundary condition from the Field Output toolbar Reference Abaqus CAE User s Guide e Overview of results selection from the current model database Section 42 2 2 3 Enhanced viewport linkage Product Abaqus CAE Benefits You can now share additional characteristics among the set of linked viewports in your session Linked viewports can now share a common center of rotation viewport annotation options and view cuts Description Linked viewports can now share any of the following characteristics e A common center of rotation e The same display behavior for viewport annotations When this option is selected any changes you make to display hide or customize viewport annotations in the Viewport Annotation Options dialog box for one linked viewport are reflected across all other linked viewports This enhancement enables you to perform changes such as hiding the legend or changing the triad s font across all linked viewports e The same view cut definitions in the Visualization module Abaqus CAE Usage All modules Viewport Linked viewports Rotation centers Viewport annotation options and View cuts Reference Abaqus CAE User s Guide e Linking viewports for view manipulation Section 4 5 in the HTML version of this guide MODELING 3 Modeling This chapter discusses features related to creating your model such as node and element def
79. tion of results Add on analysis Abaqus Aqua This add on analysis capability for Abaqus Standard and Abaqus Explicit provides a capability for calculating drag and buoyancy loads based on steady current wave and wind effects for modeling offshore piping and floating platform structures Abaqus Aqua is applicable for structures that can be idealized using line elements including beam pipe and truss elements Abaqus Design This add on analysis capability for Abaqus Standard allows the user to perform design sensitivity analysis DSA The derivatives of output variables are calculated with respect to specified design parameters Abaqus Topology Optimization Module This capability is available in Abaqus CAE to perform shape and topology optimization This functionality requires an additional license to submit an optimization process for analysis Abaqus Foundation This analysis option offers more efficient access to the linear static and dynamic analysis functionality in Abaqus Standard CZone for Abaqus This add on capability for Abaqus Explicit provides access to a state of the art methodology for crush simulation based on CZone technology from Engenuity Ltd Targeted toward the design of composite components and assemblies CZone for Abaqus provides for inclusion of material crush behavior in simulations of composite structures subjected to impact Optional analysis functionality Abaqus AMS This add on analysis capability for Abaqus
80. tivity of specific contact controls for Abaqus Standard is provided based on the philosophy that the early iterations for a nonlinear implicit simulation increment should robustly find an approximate solution and subsequent iterations should fine tune the solution to provide a high degree of accuracy These objectives sometimes call for different controls settings for the early and late iterations of an increment because applying the same control settings for all iterations of an increment may sacrifice accuracy for robustness For example the existing contact stabilization feature has often helped to robustly find converged solutions but the associated stabilization forces occasionally significantly affect the reported solution In previous releases a common modeling practice was to reduce contact stabilization across increments of a simulation step however in Abaqus 6 13 contact stabilization can also be reduced across iterations of an increment With the new intra increment adaptive approach for contact stabilization a significant amount of contact stabilization can be in effect during the early iterations of an increment to more robustly find an approximate solution and for example allow some contact to be established and the final iterations of the same increment can use less or no contact stabilization so that the reported solution has little or no effects of artificial stabilization forces Intra increment adaptivity can also be applied to t
81. ts of multiple viscoelastic networks and optionally one elastoplastic network The elastic response in all the networks is specified using one of the hyperelastic material models available in Abaqus The response of the equilibrium network network 0 in Figure 6 1 can be purely elastic or it can include plasticity and Mullins effect to predict softening during unloading The viscous response in the viscoelastic networks is governed by a flow rule derived from the Mises stress potential and the strain hardening law the hyperbolic sine law the Bergstrom Boyce law or user defined laws In addition thermo rheologically simple temperature effects can be included in each viscoelastic network by specifying the shift function The following forms of the shift function are supported the Williams Landel Ferry form the Arrhenius form and user defined forms Figure 6 1 Nonlinear viscoelastic elastoplastic model with multiple parallel networks References Abaqus Analysis User s Guide e Parallel rheological framework Section 22 8 2 Abaqus Keywords Reference Guide e MULLINS EFFECT e PLASTIC MATERIALS e TRS e VISCOELASTIC Abaqus User Subroutines Reference Guide e UCREEPNETWORK Section 1 1 23 e UTRSNETWORK Section 1 1 54 Abaqus Verification Guide e Nonlinear large strain viscoelasticity with hyperelasticity Section 2 2 8 6 3 Permanent magnetization Product Abaqus Standard Benefits You can model p
82. ture generation analysis Description Parallel execution of element operations through MPI based parallelization is available for static implicit dynamic or direct solution steady state dynamic analyses using substructures if results recovery within substructures is not requested The boundary and surface impedances or nonreflective boundaries are supported for coupled acoustic structural substructure generation analysis Other changes in the substructure generation procedure include the following e performance of substructure generation with multiple substructure load cases has been significantly improved and e writing substructure matrices to the output database odb file is no longer supported References Abaqus Analysis User s Guide e Using substructures Section 10 1 1 e Defining substructures Section 10 1 2 Abaqus Keywords Reference Guide e IMPEDANCE ANALYSIS TECHNIQUES e SIMPEDANCE e SUBSTRUCTURE GENERATE e SUBSTRUCTURE MATRIX OUTPUT 5 6 Discrete element method Products Abaqus Explicit Abaqus Viewer Benefits You can now perform an analysis using the discrete element method to model events in which large numbers of discrete particles contact each other Description A new particles method allows you to perform an analysis using the discrete element method DEM This method provides a versatile tool for modeling particulate material behavior in pharmaceutical chemical food ceramic me
83. verage for stiffness and mass matrices 12 2 EXECUTION Description The abaqus fromNastran execution procedure can now calculate the stiffness and mass matrices for CSHEAR and PSHEAR elements in Nastran data and output them to the Abaqus input file as USER ELEMENT LINEAR and MATRIX TYPE STIFFNESS and TYPE MASS This enhancement enables you to include these data in your Abaqus analyses When you use the abaqus toNastran execution procedure to translate the Abaqus substructure in a substructure SIM database to Nastran DMIG coefficients you can use the new complex parameter to write the structural damping matrix separately or as the imaginary part of the stiffness matrix References Abaqus Analysis User s Guide e Translating Nastran bulk data files to Abaqus input files Section 3 2 26 e Translating Abaqus files to Nastran bulk data files Section 3 2 27 12 5 Element matrix assembly utility Product Abaqus Standard Benefits You can now assemble element matrices contained in a SIM document and optionally write the assembled matrices to text files Description The abaqus mtxasm execution procedure assembles element matrices contained in a SIM document and optionally writes the assembled matrices to text files If assembled matrices are already available in a SIM document you can use this utility to write them to text files Reference Abaqus Analysis User s Guide e Element matrix assembly utility
84. x eigensolver enhancements Solid heat transfer in Abaqus CFD Prescribed motion in eddy current simulations Steady state analysis in Abaqus CFD K omega turbulence model in Abaqus CFD Hybrid wall functions in Abaqus CFD 5 Analysis techniques New approach for mesh smoothing Enhancements to the XFEM based crack propagation capability Enhancements for import analysis Substructure generation using the AMS eigensolver Substructuring enhancements Discrete element method CONTENTS 1 1 1 2 1 3 2 1 2 2 2 3 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 5 1 5 2 5 3 5 4 5 5 5 6 CONTENTS 10 11 12 Parallel enhancement of SPH analysis Co simulation between electromagnetic and thermal or stress analysis procedures Global and element by element matrix generation in heat transfer analyses Matrix input capability enhancements Materials Composite modal damping Parallel rheological framework Permanent magnetization Tabulated equation of state in Abaqus CAE Nonlinear magnetic permeability in Abaqus CAE Elements New pyramid element Electromagnetic prism element Prescribed conditions Creating element sets using the volume fraction tool Constraints Enhancements to embedded elements Interactions Beam to surface and beam to beam contact Enhanced convergence behavior for Abaqus Standard contact analyses Contact pressure dependent constraint enforcement in perturbation steps Contact thickness enh
85. xceeds 0 495 which corresponds to the initial bulk modulus exceeding 100 times the initial shear modulus due to the high likelihood of numerical problems without 13 2 OUTPUT AND VISUALIZATION hybrid elements in such cases An environment variable setting nonhybrid_incompress100_diag WARNING is provided to convert this error message to a warning message allowing the simulation to proceed past the batch preprocessing phase although this is not generally recommended e Warning messages appearing in the message msg file stating that the system matrix has negative eigenvalues which are issued if Abaqus Standard detects that the system of equations is not positive definite have been enhanced such that potential causes listed within the warning message are more specialized to characteristics of the model Previously the list of potential causes would include comments about procedures that did not exist in a model The list of potential causes for negative eigenvalue warning messages now includes an entry related to the use of non hybrid solid elements with a material having an initial Poisson s ratio exceeding 0 48 if this is a characteristic of the model For general nonlinear steps negative eigenvalue warnings are often an indication of numerical or physical instabilities in a model Convergence behavior is sometimes poor when negative eigenvalue warning messages are issued Negative eigenvalue warnings do not always indicate a serious pro

PDF Abaqus Release Notes

Contents

Download Pdf Manuals

Related Search

Related Contents