Abaqus Interface for Moldflow User`s Manual
Contents
1. Abaqus 6 12 Abaqus Interface for Moldflow User s Manual 2 DS SIMULIA Abaqus Interface for Moldflow User s Manual 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 wit2. Syst mes shares are listed on Euronext Paris 13065 DSY PA and Dassault Systemes ADRs may be traded on the US Over The Counter OTC market DASTY For more information visit www 3ds com JS DASSAULT SUSTEMES 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 2012 www 3ds com Rbaqus the 3DS logo SIMULIA CATIA Solidworks DELMIA ENOVIA 3DVIA and Unified FEA are trademarks or registered trademarks of Dassault Syst mes or its
3. kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk INCLUDE INPUT moldflow ex2 elsets inp kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk INCLUDE INPUT moldflow_ex2_sections inp kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk MATERIAL NAME moldflow mat 01 ELASTIC TYPE SHORT FIBER EXPANSION TYPE SHORT FIBER DENSITY 1500 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk INITIAL CONDITIONS TYPE STRESS SECTION POINTS INPUT moldflow ex2 str kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkxk STEP FREQUENCY EIGENSOLVER LANCZOS 10 END STEP 4 4 Example 3 Deformation due to initial stresses in a three dimensional filled bracket This example uses a solid Abaqus finite element model that is similar to the model used in Example 1 To execute the Abaqus Interface for Moldflow enter the following command abaqus moldflow job bracket3d mpi6 3D initial stress on A contour plot of initial stresses is shown in Figure 4 2 EXAMPLES S Mises Avg 75 8 424e 07 7 787e 07 7 150e 07 6 513e 07 5 876e 07 5 239e 07 4 601e 07 3 964e 07 3 327e 07 2 690e 07 2 053e 07 1 416e 07 7 791e 06 Figure 4 2 Contour plot of the initial stresses for the filled bracket using Moldflow Version 1 6 About SIMULIA SIMULIA 15 the Dassault Systemes brand that delivers a scalable portfolio of Realistic Simulation solutio
4. For midplane simulations the Abaqus Interface for Moldflow reads the interface pat and osp files created by Abaqus Interface for Moldflow Version MPI 3 or later For three dimensional solid simulations using Moldflow Version MPI 6 the Abaqus Interface for Moldflow reads the interface inp and xml files created using the Visual Basic script mpi2abq vbs This script is part of the Abaqus Interface for Moldflow installation and is typically found in the moldflow install dir Plastic Insight 6 0 data commands directory 1 1 INTRODUCTION 1 3 What is the general procedure for using the Abaqus Interface for Moldflow The following procedure summarizes the typical usage of the Abaqus Interface for Moldflow The remaining sections of this manual discuss these steps in detail To use the Abaqus Interface for Moldflow 1 Run a Moldflow simulation 2 Export the data as follows e For a midplane Moldflow simulation export the finite element mesh data to a file named job name pat and the results data material properties and residual stresses to a file named job name osp For a three dimensional solid Moldflow simulation using Moldflow Version MPI 6 run the Visual Basic script mpi2abq vbs to export the finite element mesh data to a file named job name mesh inp and the results data to xml files 3 Run the Abaqus Interface for Moldflow to create a partial Abaqus input file from the Moldflow interface files 4 Edit the Abaqus
5. data Results data job name_w12 xml job name PoissonRatios xml job name v13 xml Job name_v23 xml Job name_g12 xml Job name_ShearModuli xml Job name_g13 xml Job name_g23 xml Job name_ltec_1 xml Job name_Ltecs xml Job name_ltec_2 xml Job name_ltec_3 xml job name ell xml job name Moduli xml job name e22 xml Job name_e33 xml Job name_initStresses xml Job name_initStresses xml Job name_principalDirections xml The Moldflow interface files contain the following information Finite element mesh data e For midplane simulations the mesh data are in a Patran neutral file containing nodal coordinates element topology and element properties Material For three dimensional solid simulations the mesh data are in an Abaqus input file containing nodal coordinates element topology element properties and boundary conditions sufficient to eliminate the structure s rigid body modes Solid elements in the mesh files are always 4 node tetrahedra The translator has an option to convert these to 10 node tetrahedra property data Elastic and thermal expansion coefficients for each element For midplane simulations these properties may be isotropic or orthotropic For three dimensional solid simulations of filled DESCRIPTION OF THE TRANSLATOR models these properties are orthotropic For three dimensional solid simulations of unfilled models the d
6. of comments that summarize the data provided by the Moldflow interface files and how the data are translated to the Abaqus input file Additional data such as boundary conditions and loads and nondefault output requests must be added to this file manually Neutral sh file containing material data for layered spatially varying material properties Material data are translated into an appropriately formatted ASCII neutral file This file contains lamina material property data for each layer of each element The Abaqus keywords ELASTIC TYPE SHORT FIBER and EXPANSION TYPE SHORT FIBER in the Abaqus input inp file direct Abaqus Standard to read material data from this file during the initialization step Data lines in the neutral sh file First line 1 Number of elements in the sh file 2 Number of layers in each shell section Subsequent lines 1 Element label 2 Layer identifier 3 Ej 4 Ez 5 119 El DESCRIPTION OF THE TRANSLATOR se Pp Q e 11 Fiber orientation angle in degrees measured relative to the default element orientation This data line is repeated as often as necessary to define the above parameters for different layers of a shell section within different elements Initial stress str file Residual stress data from the Moldflow analysis are translated into an appropriately formatted ASCII neutral file These data are defined in terms of the local Abaqus coordinat
7. 9 S3R elements SHELL SECTION COMPOSITE 7 ELSETs 4 8 EXAMPLES kk MATERIAL ELASTIC TYPE SHORT FIBER EXPANSION TYPE SHORT FIBER NE elastic and expansion data will be read from file moldflow exl shf kk ER INITIAL CONDITIONS TYPE STRESS SECTION POINTS INPUT moldflow_exl str kk KR STEP X Dummy step data Loads and boundary conditions xx may need to be added to complete the model kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk HEADING TITL kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk NODE NSET NALL INPUT moldflow_exl_nodes inp FOI k k ELEMENT TYPE S3R ELSET EALL INPUT moldflow exl elements inp kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk INCLUDE INPUT moldflow 1 elsets inp kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk INCLUDE INPUT moldflow exl sections inp ke k k k MATERIAL NAME moldflow mat 01 ELASTIC TYPE SHORT FIBER EXPANSION TYPE SHORT FIBER DENSITY 1500 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk INITIAL CONDITIONS TYPE STRESS SECTION POINTS INPUT moldflow_exl str kkkkkkkkk
8. S echo of header information from the Moldflow interface files kk TITL information from osp file TITL kk FILE information from osp file FILE JUN14 2002 11 19 59 mpi310 Residual Stress Properties kk KR number of nodal properties 0 RR number of element properties 45 number of nodes 958 number of TRI elements 1719 number of 1D elements 32 kk Moldflow results were written with IST coding i e this is an unfilled anisotropic material with residual stresses ee Lore c this input file was created with the following keyword data kk NODE 926 nodes kk ELEMENT 1719 S3R elements kk SHELL SECTION COMPOSITE 7 ELSETs kk MATERIAL KR ELASTIC TYPE SHORT FIBER ER EXPANSION TYPE SHORT FIBER xx elastic and expansion data will be read from file moldflow ex2 shf kk INITIAL CONDITIONS TYPE STRESS SECTION POINTS NE INPUT moldflow ex2 str kk STEP Dummy step data Loads and boundary conditions Er may need to be added to complete the model 4 6 EXAMPLES kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk HEADING TITL ek ke e hee KK KK KKK KEK RARA RA RARA HH KK RK K KK NODE NSET NALL INPUT moldflow ex2 nodes inp kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk ELEMENT TYPE S3R ELSET EALL INPUT moldflow_ex2_elements inp
9. To facilitate data transfer with SIMULIA an anonymous ftp account is available at ftp simulia com Login as user anonymous and type your e mail address as your password Contact support before placing files on the site Training All offices and representatives offer regularly scheduled public training classes The courses are offered in a traditional classroom form and via the Web We also provide training seminars at customer sites All training classes and seminars include workshops to provide as much practical experience with Abaqus as possible For a schedule and descriptions of available classes see www simulia com or call your local office or representative Feedback We welcome any suggestions for improvements to Abaqus software the support program or documentation We will ensure that any enhancement requests you make are considered for future releases If you wish to make a suggestion about the service or products refer to www simulia com Complaints should be made by contacting your local office or through www simulia com by visiting the Quality Assurance section of the Support page CONTENTS Contents Introduction 1 1 What information does this manual 1 2 What is the Abaqus Interface for 1 1 3 What is the general procedure for using the Abaqus Interface for Moldflow Description of the translator 2 1 Moldflow sim
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11. ata files contain orthotropic data adjusted to represent physically isotropic materials Residual stress data The Moldflow simulation calculates residual stresses in the plastic part after it has cooled in the mold These residual stresses can be translated to initial stresses for the Abaqus structural analysis e For midplane simulations a plane stress initial stress state 1s defined in the same directions as the material properties The stress state in the material coordinates is defined in terms of the principal stresses the shear stress 1s zero e For three dimensional solid simulations residual stresses for each element in job name initStresses xml are in global coordinates The translator transforms these coordinates to the same directions as the material properties 2 3 Assumptions used to translate the Moldflow data for midplane simulations For midplane simulations the Abaqus Interface for Moldflow translator makes a number of assumptions regarding the topology and properties of the data These assumptions listed below ensure compatibility with the options available in the current release of Abaqus e The Moldflow mesh can consist of 3 node planar triangular elements as well as 2 node one dimensional elements that represent components such as runners and ribs The Abaqus Interface for Moldflow translates the triangular elements to an identical mesh of Abaqus S3R shell elements One dimensional elements in the Moldflow mesh are
12. computed and placed in this binary file DESCRIPTION OF THE TRANSLATOR Thermal expansion tpt file containing element thermal expansion coefficient data The orthotropic thermal expansion data from the Moldflow analysis are collected and placed in a binary file These are defined in terms of the local Abaqus coordinate system of each element USING THE Abaqus Interface for Moldflow 3 Using the Abaqus Interface for Moldflow This chapter describes the procedure used to create the Abaqus input files from the Moldflow interface files and how to prepare the input files for analysis The following topics are covered e Execution procedure for the Abaqus Interface for Moldflow Section 3 1 e Preparing the Abaqus input inp file for analysis Section 3 2 3 1 Execution procedure for the Abaqus Interface for Moldflow Upon execution the Abaqus Interface for Moldflow reads the Moldflow interface files and creates the relevant Abaqus files The files created depend on the options included on the command line You execute the Abaqus Interface for Moldflow using the following command abaqus moldflow job job name input input name midplane 3D element order 1 2 initial stress on o material traditional orientation traditional You can include the following options on the command line job This option specifies the name of the Abaqus input files to be created It is also the default name of the files
13. containing the Moldflow interface data input This option 1s used to specify the name of the files containing the Moldflow interface data if it 1s different from job name midplane This option is used to translate the results of a midplane simulation to an Abaqus model with three dimensional shell elements 3D This option is used to translate the results of a three dimensional solid simulation to an Abaqus model with solid elements 3 1 USING THE Abaqus Interface for Moldflow element_order This option is used to specify the order of elements created in the partial input file for three dimensional solid simulations Possible values are 1 to create first order elements C3D4 and 2 to create second order elements C3D10 The default value is 2 This option is valid only when using the 3D option initial_stress This option specifies whether or not initial stress will be included in the model This option is valid only when using the 3D option If the initial stress option is not included or initial_stress off initial stresses will not be translated If initial stress on initial stresses will be written to the input file material This option is used to specify where the material properties are written If material traditional the material properties will be written to the input file Otherwise the material properties will be written to the binary mpt file Using material traditional is not recommended for large mode
14. e system at each section point The Abaqus keyword INITIAL CONDITIONS TYPE STRESS SECTION POINTS in the Abaqus input inp file directs Abaqus Standard to read initial stress data from this file during the initialization step 2 5 2 Files created for a three dimensional solid simulation If you are using an unfilled model the Abaqus Interface for Moldflow creates only the partial Abaqus input file described below For a three dimensional solid simulation using a filled model the Abaqus Interface for Moldflow may create additional files as described below Partial Abaqus input inp file The partial Abaqus input file contains model data consisting of nodal coordinates element topology and section definitions Additional data such as service loads and boundary conditions and nondefault output requests must be added to this file manually Boundary condition data sufficient to remove rigid body modes are also included Material mpt file containing orthotropic material properties data Material data from the Moldflow analysis are collected and placed in a binary file The data written to the file are in the same form as the information provided for the Abaqus keyword ELASTIC TYPE ENGINEERING CONSTANTS These are defined in terms of the local Abaqus coordinate system of each element Orientation opt file containing element orientation data Orientations defining the directions for material properties and initial stresses are
15. ed models without oriented fibers are referred to as unfilled The temperature of the model at the end of the analysis is taken to be uniform at the ambient temperature specified in the Moldflow analysis Residual stresses due to cooling are also included if requested For detailed information on obtaining a solution with Moldflow and preparing the interface files please refer to the relevant Moldflow documentation Note The Abaqus finite element mesh generated by the Abaqus Interface for Moldflow has the same topology as the Moldflow mesh except for an option to convert 4 node linear tetrahedra to 10 node quadratic tetrahedra for three dimensional solid models Therefore when you create the mesh for the original Moldflow analysis you should design a topology that 1s appropriate for both the mold filling simulation in Moldflow and the structural analysis in Abaqus The Moldflow interface files For midplane simulations you must use Moldflow to create two interface files job name pat and job name osp Both files must use the same units 2 1 DESCRIPTION OF THE TRANSLATOR For three dimensional solid simulations using Moldflow Version MPI 6 the mesh and results files for filled and unfilled models are listed in Table 2 1 Table 2 1 Interface files generated using the Visual Basic script for Moldflow Version MPI 6 Data type Filled model Unfilled model Finite element job name_mesh inp job name_mesh inp mesh
16. equency analysis of an unfilled bracket Section 4 3 e Example 3 Deformation due to initial stresses in a three dimensional filled bracket Section 4 4 Extracting example problem files You can use the Abaqus fetch utility to extract example problem files from the compressed archive files provided with the Abaqus release To extract all of the relevant files for a particular example problem you must enter the following commands Example 1 Natural frequency analysis of a fiber filled bracket abaqus fetch job moldflow exl Example 2 Natural frequency analysis of an unfilled bracket abaqus fetch job moldflow ex2 Example 3 Deformation due to initial stresses in a three dimensional filled bracket translated from Moldflow Version MPI 6 abaqus fetch job bracket3d mpi6 For more information on using wildcard expressions with the Abaqus fetch utility see Fetching sample input files Section 3 2 14 of the Abaqus Analysis User s Manual Example 1 Natural frequency analysis of a fiber filled bracket The bracket in this example consists of 926 nodes and 1719 S3R elements The model contains seven different element sets Each element set has a different thickness and is modeled as a laminated composite with 20 layers Ten unrestrained vibration modes are computed The first six frequencies are approximately zero The frequencies for the first four flexible modes are listed in Table 4 1 EXAMPLES Table 4 1 Frequencies for the fir
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19. input file to add appropriate data for the analysis for example add boundary conditions and step data 5 Submit the Abaqus input file for analysis 2 1 2 2 DESCRIPTION OF THE TRANSLATOR Description of the translator This chapter provides a short overview of the data generated by the Moldflow simulation In addition this chapter lists the assumptions used to translate the Moldflow data for the purposes of an Abaqus analysis and describes the resulting Abaqus files The following topics are covered e The Moldflow simulation Section 2 1 e The Moldflow interface files Section 2 2 e Assumptions used to translate the Moldflow data for midplane simulations Section 2 3 e Assumptions used to translate the Moldflow data for three dimensional solid simulations Section 2 4 e Files created by the Abaqus Interface for Moldflow Section 2 5 The Moldflow simulation The Moldflow injection molding simulation of polymers can provide information on the thermo mechanical properties and residual stresses of a part resulting from the manufacturing process This information is written to interface files for subsequent finite element stress analysis All mechanical properties including the effects of oriented fibers 1f present are calculated by Moldflow and written to the interface files as orthotropic constants at points through the thickness of the part Models that contain oriented fibers are referred to as fill
20. kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk STEP FREQUENCY EIGENSOLVER LANCZOS 10 END STEP kk SIGN 1joXzAUD NPKmw 4 3 EXAMPLES Example 2 Natural frequency analysis of an unfilled bracket This example uses the same Abaqus finite element model as Example 1 but the material properties are transversely isotropic The shell section definition is homogeneous instead of composite Twenty one equally spaced Simpson integration points are used through the shell thickness The frequencies for the first four flexible vibration modes of the unfilled bracket are listed in Table 4 2 The unfilled material in this example is softer than the filled material in Example 1 and consequently the frequencies are lower Table 4 2 Frequencies for the first four flexible modes for the unfilled bracket The complete input file moldflow_ex2 inp is shown below Mode Frequency Hz 7 146 8 217 9 363 10 371 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk translated data from the Moldflow interface files named moldflow_ex2 pat and moldflow_ex2 osp to the following Abaqus input file neutral material file initial stress file input files moldflow_ex2 inp moldflow ex2 shf YES NO for ELASTIC EXPANSION data moldflow ex2 str YES for INITIAL CONDITIONS data 4 5 EXAMPLE
21. ls for performance reasons since every element will have its own MATERIAL definition orientation This option is used to specify where the orientations are written If orientation traditional the orientations are written to the input file Otherwise the orientations will be written to the binary opt file Using orientation traditional is not recommended for large models for performance reasons since every element will have its own ORIENTATION definition 3 2 Preparing the Abaqus input inp file for analysis Once the Abaqus Interface for Moldflow has created the Abaqus input inp file you must complete the input file manually before submitting it for analysis Refer to the Abaqus Analysis User s Manual for detailed information on performing an Abaqus analysis 3 2 1 Preparing for a shrinkage and warpage analysis A shrinkage and warpage analysis calculates the deformation caused by the residual stresses in the model after it is removed from the mold Usually only rigid body modes must be removed In this case you must ensure that residual stresses have been translated For three dimensional solid Moldflow simulations boundary conditions sufficient to restrain rigid body modes are automatically USING THE Abaqus Interface for Moldflow translated to the input file In other cases you are required to add appropriate boundary conditions to remove the rigid body modes of the model In certain cases problems with convergence can
22. m for each layer Moldflow through thickness integration points are taken as the midpoint of each Abaqus layer Material properties are constant for each layer Abaqus section point initial stresses are the same as the values at the Moldflow through thickness integration points and constant through each layer The Abaqus input file that the Abaqus Interface for Moldflow generates does not contain boundary condition and load data You must add this information to the input file manually 2 4 Assumptions used to translate the Moldflow data for three dimensional solid simulations For three dimensional solid simulations the Abaqus Interface for Moldflow translator makes a number of assumptions regarding the topology and properties of the data These assumptions listed below ensure compatibility with the options available in the current release of Abaqus The Abaqus Interface for Moldflow translates the tetrahedral elements to an identical mesh of Abaqus C3D4 or C3D10 solid elements see Execution procedure for the Abaqus Interface for Moldflow Section 3 1 for more information Orthotropic material constants are in terms of material principal directions Material properties are constant for each element Orientations are defined in job name_principalDirections xml by giving vectors defining the local 1 and 2 directions Residual stresses computed by the WARP3D module of Moldflow in job name initStresses xml are tra
23. not translated e The number of layers in the Abaqus S3R shell elements created by the Abaqus Interface for Moldflow 1s equal to the number of layers passed by Moldflow which is 20 As a result the mechanical properties and stress data passed to the Abaqus Interface for Moldflow apply to 20 layers through the thickness The Abaqus input data created by the Abaqus Interface for Moldflow depend on the kind of material defined in the interface osp file as follows For unfilled isotropic materials Abaqus assumes the following A homogeneous shell formulation Isotropic material constants Abaqus section point initial stresses are interpolated from the values at the Moldflow through thickness integration points For unfilled transversely isotropic materials Abaqus assumes the following A homogeneous shell formulation El DESCRIPTION OF THE TRANSLATOR Transversely isotropic material constants defined for the section in terms of material principal directions plus the orientation with respect to the local Abaqus coordinate system Abaqus section point initial stresses are interpolated from the values at the Moldflow through thickness integration points For fiber filled materials Abaqus assumes the following A composite shell formulation Lamina material constants defined for each layer in terms of material principal directions plus the orientation with respect to the local Abaqus coordinate syste
24. ns including the Abaqus product suite for Unified Finite Element Analysis multiphysics solutions for insight into challenging engineering problems and lifecycle management solutions for managing simulation data processes and intellectual property By building on established technology respected quality and superior customer service SIMULIA makes realistic simulation an integral business practice that improves product performance reduces physical prototypes and drives innovation Headquartered in Providence RI USA with R amp D centers in Providence and in V lizy France SIMULIA provides sales services and support through a global network of regional offices and distributors For more information visit www simulia com About Dassault Systemes As a world leader in 3D and Product Lifecycle Management PLM solutions Dassault Systemes brings value to more than 100 000 customers in 80 countries A pioneer in the 3D software market since 1981 Dassault Systemes develops and markets PLM application software and services that support industrial processes and provide a 3D vision of the entire lifecycle of products from conception to maintenance to recycling The Dassault Systemes portfolio consists of CATIA for designing the virtual product Solidworks for 3D mechanical design DELMIA for virtual production SIMULIA for virtual testing ENOVIA for global collaborative lifecycle management and 3DVIA for online 3D lifelike experiences Dassault
25. nsformed from global coordinates to local material directions and used as initial stresses in Abaqus Loads and boundary conditions representing service loads must be added to the input file manually For simulations using Moldflow Version MPI 6 the Abaqus input file created by the translator contains boundary conditions sufficient to remove rigid body modes from the model so that an analysis to solve for the response due to initial stresses can be performed easily DESCRIPTION OF THE TRANSLATOR 2 5 Files created by the Abaqus Interface for Moldflow The Abaqus Interface for Moldflow reads the Moldflow interface files and creates the relevant files The files created depend on which options you include on the command line when executing the Abaqus Interface for Moldflow The files are described in the following sections e Files created for a midplane simulation Section 2 5 1 e Files created for a three dimensional solid simulation Section 2 5 2 2 5 1 Files created for a midplane simulation For a midplane simulation the Abaqus Interface for Moldflow creates the following three files Partial Abaqus input inp file The partial Abaqus input file contains model data consisting of nodal coordinates element topology and section definitions It also contains a STATIC step with default output requests If you are working with isotropic materials the input file contains material property data Each input file begins with a series
26. occur when you must account for geometric nonlinearity and large initial stresses are present You can overcome these problems by using two analysis steps e n the first step constrain all displacement degrees of freedom e In the second step use the OP NEW parameter to apply boundary conditions that remove the rigid body modes 3 2 2 Preparing for a service loading analysis A service loading analysis with appropriate boundary conditions assesses the performance of the model You can perform this analysis with or without initial stresses You must specify the appropriate boundary conditions and loads as history data in the Abaqus input file 3 2 3 Preparing for other analysis types Any Abaqus Standard analysis procedure can be performed with the translated model provided that you specify the correct boundary conditions and loading in the Abaqus input file In addition certain analysis types may require you to specify additional material constants model data and or solution controls in the input file 3 3 4 1 4 2 EXAMPLES Examples This chapter provides examples of Moldflow models translated to Abaqus input files by the Abaqus Interface for Moldflow All of the files associated with these examples are included with the Abaqus release The following topics are covered Extracting example problem files Section 4 1 Example 1 Natural frequency analysis of a fiber filled bracket Section 4 2 Example 2 Natural fr
27. st four flexible modes for the fiber filled bracket Mode Frequency Hz 7 334 8 430 9 740 10 752 The Abaqus finite element model is shown in Figure 4 1 Figure 4 1 Finite element mesh of the fiber filled bracket The complete input file moldflow_ex1 inp is shown below kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk kk translated data from the Moldflow interface files named 4 2 kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk kk EXAMPLES moldflow exl pat and moldflow exl osp to the following Abaqus input files input file moldflow exl inp YES neutral material file moldflow exl shf YES for ELASTIC EXPANSION data initial stress file moldflow exl str YES for INITIAL CONDITIONS data echo of header information from the Moldflow interface files TITL information from osp file TITL FILE information from osp file FILE JUN14 2002 11 13 29 mpi310 Residual Stress Properties number of nodal properties 0 number of element properties 13 number of nodes 926 number of TRI elements 1719 number of 1D elements 0 Moldflow results were written with ISP coding i e this is a filled anisotropic material with residual stresses this input file was created with the following keyword data NODE 926 nodes ELEMENT 171
28. ulation 2 0 0 ce Ih 2 2 The Moldflow interface 2 3 Assumptions used to translate the Moldflow data for midplane simulations 2 4 Assumptions used to translate the Moldflow data for three dimensional solid simulations 2 5 Files created by the Abaqus Interface for 1 2 5 1 Files created for a midplane 2 5 2 Files created for a three dimensional solid simulation Using the Abaqus Interface for Moldflow 3 1 Execution procedure for the Abaqus Interface for Moldflow 3 2 Preparing the Abaqus input inp file for 3 2 1 Preparing for a shrinkage and warpage analysis 3 22 Preparing for a service loading 1 3 2 3 Preparing for other analysis Examples 4 1 Extracting example problem 4 2 Example 1 Natural frequency analysis of a fiber filled bracket 4 3 Example 2 Natural frequency analysis of an unfilled bracket 4 4 Example 3 Deformation due to initial stresses in a three dimensional filled bracket INTRODUCTION 1 Introduction This chapter provides an overview of the Abaqus Interface for Moldflo
29. utech com tw Thailand WorleyParsons Pte Ltd Singapore Tel 65 6735 8444 abaqus sg worleyparsons com Turkey A Ztech Ltd Istanbul Tel 90 216 361 8850 info a ztech com tr Complete contact information is available at http www simulia com locations locations html Preface This section lists various resources that are available for help with using Abaqus Unified FEA software Support Both technical engineering support for problems with creating a model or performing an analysis and systems support for installation licensing and hardware related problems for Abaqus are offered through a network of local support offices Regional contact information is listed in the front of each Abaqus manual and is accessible from the Locations page at www simulia com Support for SIMULIA products SIMULIA provides a knowledge database of answers and solutions to questions that we have answered as well as guidelines on how to use Abaqus SIMULIA Scenario Definition Isight and other SIMULIA products You can also submit new requests for support All support incidents are tracked If you contact us by means outside the system to discuss an existing support problem and you know the incident or support request number please mention it so that we can query the database to see what the latest action has been Many questions about Abaqus can also be answered by visiting the Products page and the Support page at www simulia com Anonymous ftp site
30. w The following topics are covered e What information does this manual contain Section 1 1 e What is the Abaqus Interface for Moldflow Section 1 2 e What is the general procedure for using the Abaqus Interface for Moldflow Section 1 3 The installation ofthe Abaqus Interface for Moldflow is included in the Abaqus product installation For information on installing Abaqus see the Abaqus Installation and Licensing Guide 1 1 What information does this manual contain This manual explains how to use the Abaqus Interface for Moldflow for midplane three dimensional shell and three dimensional solid simulations For detailed information about using Moldflow see the Moldflow documentation collection available from Autodesk Inc 1 2 What is the Abaqus Interface for Moldflow Autodesk Inc creates simulation software that is used by the plastics injection molding industry One of these programs Moldflow Plastics Insight referred to as Moldflow in this manual models the mold filling process The results of a Moldflow simulation include calculations of material properties and residual stresses in the plastic part The Abaqus Interface for Moldflow translates finite element model information from a Moldflow analysis into a partial Abaqus input file The translator requires the Moldflow interface files that are created by the Moldflow analysis See The Moldflow interface files Section 2 2 for more information
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