FEA Newsletter December 2006 - Free of Papers from LS
Contents
1. Bas EI SA Jexpl me We K T AN Yon The user subroutine allows the creation of more sophisticated material models with the interchange of material history variables between the mechanical material user subroutine and the thermal material user subroutine References Figure courtesy of David Lorenz DaimlerChryler Mercedes Car Group Germany 2 I T Shvets Contact Heat Transfer Between Plane Metal Surfaces Int Chem Eng Vol 4 No 4 p621 1964 3 Li amp Sellers Proc Of 2 Int Conf Modeling of Metals Rolling Processes The Institute of Materials London 1996 4 D Hilding amp E Schedin Experience from Using a New Material Model for Stainless Steels with TRIP effect sin European LS DYNA Users Conference Birmingham UK 2005 pa F EAnformation com es un S U0 M S LULU Y S UW OO VU uo TPS mun TPS nun Amed AILATODDOO sn npo MH n P Y a pas pid J l ka IN Ajisuaq juofeAmnnbq INSSI JIIOJ out L ysu SSeJA J 189H I OL Bse T EUEN y 10 S TEAS pO PIOI OZOT 103 ase sonsadoig suirdwes pejoun 107 pasn szos yun peordAj ane UMOYS IGP Xny F EAnformation com LS DYNA December AVI s posted Complete AVI s are located at www feainformation com top bar link AVI Lib AVI e courtesy of Gaurav Nilakantan University of Cincinnati OH USA Site Drop Testing Page Gallery 59 Fabric Impact by RCC 59a Platform Drop Test with energy absorbing element 59b2. e Dr Ala Tabiei Marsha Victory E Suri Bala Graphic Designer Wayne L Mindle Technical Consultants Steve Pilz Reza Sadeghi FAnformation com FEA Information Announcements FEA News We have posted new AVI s in the on line AVI library 2007 sites are being redesigned e For better performance in IE e New Site Feb 2007 LS DYNA Resources e New Site Feb 2007 LS DYNA Consultants FEA News Travel Marsha Victory will be traveling on business to China January 28 Feb 03 Beijing and Shanghai LSTC News 2007 LSTC Classes are now posted on the LSTC website Sinardy Art Shapiro art feainformation com Marsha J Victory mv feainformation com The content of this publication is deemed to be accurate and complete However FEA Information Inc doesn t guarantee or warranty accuracy or completeness of the material contained herein All trade marks are the property of their respective owners This publication is published for FEA Information Inc copyright 2006 All rights reserved Not to be reproduced in hardcopy or electronic copy Note All reprinted full articles excerpts notations and other matter are reprinted with permission and full copyright remains with the original author or company designated in the copyright notice FGAnformation com 3 LS DYNA Publication LS DYNA Features for Hot Stamping Copyright O 2006 Livermore Software Technology Corporation 9 International LS DYNA Users Conference Ar
3. Dynamic axial crushing of cylindrical shell AVI s courtesy ENSICA France Site LS DYNA Page Metal Cut 613 613d Metal cutting F EAnformation com Experience LS DYNA by the hour FREE A 5 000 hour HP Flexible Computing Services utility computing trial to qualified LS DYNA commercial customers Flexible IT for your most de manding jobs Copyright Hewlett Packard 04 2006 A 4 500 value this offer includes 16 Xeon 64 bit CPU s for 2 weeks 5 376 CPU hours LS DYNA MPP version 971 Redhat Enterprise Linux HP MPI SSH connectivity Take advantage of this offer NOW to ensure your access to capacity Here s all you need to do 1 Go to the HP Web page shown at the bottom of this offer page and click as instructed 2 Enter some basic qualification in formation that s it HP will 1 Contact you within 2 business days to confirm your information 2 Schedule your trial 3 Provide you with instructions for access to the HP Flexible Comput ing Services utility 4 Provide you with Instructions for submitting your LS DYNA jobs About the LS DYNA HP Flexible Com puting Services Solution Hewlett Packard delivers a new complete LS DYNA Utility Computing Service under the HP Flexible Computing Services port folio This unique utility computing ser vice offers LS DYNA customers servers networking storage and LS DYNA licens ing all hosted at a highly secure HP owned data center
4. I ntel Xeon Processors Set Industry Performance Standard Systems Achieve Dramatic mprove ments in Performance and Address Power and Cooling Challenges SUNNYVALE Calif December 5 2006 Fujitsu Computer Systems Corporation today announced five new PRIMERGY two socket servers that offer Fujitsu cus tomers even more choices for highly reli able servers tower models TX200 S3 and TX300 S3 rack based models RX200 S3 and RX300 S3 and a blade server BX620 S3 All servers feature the latest Intel Quad Core Xeon processors E5310 and E5320 which deliver almost double the performance per watt over the latest gen eration of Intel dual core processors Complete Announcement Fujitsu 19 MSC Software Announces New Global Impact Program Partners to Market and Deliver SimOffice Leading Reseller Partners to Provide Manufacturers of All Sizes with the Industry s First Windows Vista Com patible Desktop Simulation Environ ment SANTA ANA Calif December 4 2006 MSC Software Corp NASDAQ MSCS SimOffice allows manufacturers to lever age existing IT investments and simula tion environments through the entire suite of Microsoft productivity and collaboration solutions including Windows Vista Micro soft Office Sharepoint and Microsoft Office Groove With SimOffice organizations who either may not yet be taking advan tage of simulation or for whom it is a smaller part of their business can gain a co
5. a local coordinate system that is embedded in the master segment and is updated every cycle Based on the sign of the pro jected distance LS DYNA determines if the node is inside penetration or outside no penetration the master segment Projected distance that is less than O indicates that a penetration has occurred while a positive projected distance indicates a no penetration condition 3 Initial Penetration Initial penetration is a term used frequently to describe the amount of pene tration that exists between a node and its closest master segment in the case of classic node segment treatment or between two interacting seg ments in the case of segment based treatment during the initializa tion of the problem This is shown in Figure 2 by considering only the thickness on the master segment for simplicity F EAnformation com Yahoo Group Yammerings Note LS DYNA Yahoo Group is neither owned nor operated by LSTC and LSTC has no control over the content Jim Kennedy Len Schwer KBS2 Inc Schwer Engineering 6 Consulting Services Imk kbs2 com Len Schwer net The LS DYNA Yahoo Group archives contains a wealth of information that can be helpful to any LS DYNA user We suggest you review the archives when you are seeking help on any topic related to LS DYNA This installment of Yahoo Yammerings features five questions with responses from the past month of postings to the LS DYNA Yahoo Group ls FCONTROL_ADAPTIVE
6. con cept crash FE crash and coupled rigid body FE crash simulations in conjunction with MADYMO EASI CRASH DYNA s main features in clude e Support of all keywords of LS DYNA 970 971 e Powerful mesh editing features such as automesh and remesh e LS DYNA MADYMO coupling capa bilities for pre and post processing e Model Assembler for organizing the model through sub assembly sub models and included files SE O Serge bh a Enhanced Weld tools for manipula tion of connections and Weld com parison Simple dummy positing and seat belt routing Pre and Post processing in same environment Superpose and merge multiple models Animation and plotting Process compatible Full capability to handle IGES CATIA V4 CATIA V5 UG and ASTRAN files SL e e FGAnformation com 31 Previous Month November Weekly News Page Highlights Review Complete Product Service Information can be found on the respective company websites era Complete Information eta VPG provides an efficient and comprehensive environment for development of finite element models In addition VPG delivers a unique set of tools which allow engineers to create and visualize advanced simulations for vehicle crashworthiness and dynamic durability na FUJITSU For Complete Information Fujitsu to Demonstrate NeTTomorrow Next Generation Networking Concept at ITU TELECOM WORLD 2006 in Hong Kong Tokyo November 17 2006 Fujitsu Limited tod
7. translation issues and eliminates the need for addi tional software training MSC Software Gateway for LS DYNA Gateway for LS DYNA provides you with the ability to access basic LS DYNA simulation capabilities in a fully inte grated and generative way Accessed via a specific Crash workbench on the GPS workspace the application enhances CATIA V5 to allow finite element analysis models to be output to LS DYNA and then results to be displayed back in CATIA Gateway for LS DYNA supports explicit nonlinear analysis such as crash drop test and rigid wall analysis 29 Gateway products provide CATIA V5 us ers with the ability to directly interface with their existing corporate simulation resources and exchange and archive as sociated simulation data F EAnformation com Oasys software for LS DYNA Oasys software is custom written for 100 compatibility with LS DYNA Oasys PRIMER offers model creation editing and error removal together with many specialist functions for rapid generation of error free models Oasys also offers post processing software for in depth analysis of results and automatic report generation EASi CRASH DYNA EASI CRASH DYNA is the first fully inte grated environment for crashworthiness and occupant safety simulations with LS DYNA and covers the complete CAE process from model building and dataset preparation to result evaluation and design comparisons EASI CRASH DYNA can be used for
8. valid for SECTION SOLID ELFORM 1 or 3 Sliding Interface energy for single surface contact definition Why the fluid does not move Extra history variables for different material models Bolt preload Angular velocity Impact ST Ee Question Is FCONTROL_ADAPTI VE valid for SECTION SOLID ELFORM 1 or 3 Is FCONTROL_ADAPTIVE valid for SECTION SOLID ELFORM 1 constant stress solid or ELFORM 3 fully integrated 8 node solid with nodal rotations or it is only for SHELL elements in LS DYNA 970 In one case there is no error and there is a normal termination with CONTROL_ADAPTIVE with SECTION_SOLID ELFORM 3 The d3plot files d3plot aa ab up to d3plotav were produced etc are O K but the adapt rid file is showing no remeshed elements Post processing also shows no remeshing Can anyone throw some light on use of CONTROL ADAPTIVE with SECTION_SOLID ELFORM 1 or 3 Reply by Jim Kennedy l suggest that you read Page 7 8 of the LS DYNA Version 970 User s Manual There is an option there that allows you to use solid element adaptivity ADPOPT 7 When using this feature ELFORM 1 or 3 formulation inputs are automatically changed to ELFORM 13 1 point nodal pressure tetrahedrons You also might want to look at Page 8 8 of the LS DYNA Version 971 User s Manual ELFORM 41 mesh free appears to be a new option 10 F EAnformation com Reply by Suri Bala For solid elements R Adaptivity is supported which needs to be s
9. 4 NEC SX6 SGl Mips SGI 1A64 SUSE 9 with ProPack 4 Red Hat 3 with ProPack 3 F EAnformation com 27 TABLE 2 MPP Interconnect and MPI Vendor fos HPC Intereconnect MPI Software InfiniBand SilverStorm LAM MPI MPICH HP lt D Q O AMD Opteron Linux MyriCom QLogic InfiniPath MPI SCALI FUJITSU Prime SUN OS 5 8 FUJITSU VPP HP PA8000 A ponn SS SUSE 9 0 HP Alpha IBM Power 4 5 IBM Power 5 LAM NPI InfiniBand Voltaire LAM MPI MPICH HP MyriCom MPI SCALI Linux LAM MPI MPICH HP MPI InfiniBand Topspin Voltaire LAM MPI MPICH HP MyriCom MPI INTEL MPI INTEL 1A32 Linux Windows INTEL 1464 5 O D INTEL Xeon EMT64 QLogic InfiniPath SCALI SUSE 9 wProPack 4 NUMAIink InfiniBand Vol MPT Intel MPI taire MPICH NEC SX6 SGI Mips 0 E al 2 D x E gt lt RedHat 3 w ProPack 3 SGI 1A64 F EAnformation com 28 LS DYNA Resource Page Participant Software Interfacing or Embedding LS DYNA Each software program can interface to all or a very specific and limited seg ment of the other software program The following list are software programs interfacing to or having the LS DYNA solver embedded within their product For complete information on the software products visit the corporate website ANSYS ANSYS LS DYNA ANSYS LS DYNA Built upon the suc cessful ANSYS interface ANSYS LS DYNA is an integrated pre and postpro ce
10. DECEMBER 2006 COLINFORMATION WWW FEAINFORMATION COMNM GRID COMPUTING HP Flexible Computing Services Solution PRODUCT SPOTLIGHT ETA VPG PrePost VPG STRUCTURE VPG SAFETY HARDWARE SPOTLIGHT NEC Provides Largest SX 8R Supercomputer System in Japan to Osaka University s Cybermedia Center FEA INFORMATION RESOURCE MAGAZINE F EAnformation com FEA Information Worldwide Participants sgi FUJITSU WEC LA picie AMDA intel Gem Westone Farners eta ka B e MSC SOFTWARE ARUP 01 Index 02 FEA Announcements 03 LS DYNA Features in Hot Stamping A Shapiro 07 FEA New AVI s 08 HP Experience LS DYNA By The Hour 09 LS DYNA Initial Penetrations in Contact Interfaces 10 Yahoo Yammerings 15 India New Distributor of Oasys pre and post Software NEC Press Release Largest SX 8R Supercomputer System in Japan to Osaka University s Cybermedia Center 18 Web page highlighted VPG developed by ETA 19 Industry Press Release Excerpts 20 5 German LS DYNA Forum Review 21 LS PrePost 22 LSTC 2007 Training Schedule 24 LS DYNA Events 25 LS DYNA Resource Page 31 November News Page Highlights 32 Hardware 6 Computing and Communication Products 33 Software Distributors 35 Consulting and Engineering Services 36 Educational 6 Contributing Participants 37 China Participants 39 Informational Websites Technical Writers Editor Dr David Benson Art Shapiro Uli Franz Managing Editor
11. SC Dytran s advanced fluid structure interaction capabilities with LS DYNA s high performance structural DMP within a common simulation environment In novative explicit nonlinear technology enables extreme short duration dynamic events to be simulated for a variety of industrial and commercial applications on UNIX Linux and Windows platforms Joint solution can also be used in con junction with a full suite of Virtual Prod uct Development tools via a flexible cost effective MSC MasterKey License System Filled Fuel Tank Side Impact With Fuel Oil Inside FGAnformation com MSC Software MSC Nastran SOL 700 The MSC Nastran Explicit Nonlinear product module SOL 700 provides MSC Nastran users the ability access the explicit nonlinear structural simulation capabilities of the MSC Dytran LS DYNA solver using the MSC Nastran Bulk Data input format This product module offers unprecedented capabilities to analyze a variety of problems involving short dura tion highly dynamic events with severe geometric and material nonlinearities MSC Nastran Explicit Nonlinear will allow users to work within one common mod eling environment using the same Bulk Data interface NVH linear and nonlin ear models can be used for explicit appli cations such as crash crush and drop test simulations This reduces the time required to build additional models for another analysis programs lowers risk due to information transfer or
12. SI Co Ltd Phone 86 020 8235 6272 Contact Yang Xiaojun FGAnformation com 39 Informational Websites The LSTC LS DYNA Support site www dynasupport com LS DYNA Examples WWW dynaexamples com more than 100 Examples www dynaexamples com LS DYNA Conference Site www Is dynaconferences com LS DYNA Publications to Download On Line LS DYNA Publications www feapublications com LS DYNA CADFEM Portal www Isdyna portal com www dynalook com
13. USA Dynamax USA Livermore Software Technology Corp me FGAnformation com 35 Consulting and Engineering Services Alphabetical Order By Country direct links will be completed October Leading Engineering Analysis Providers LEAP Manly NSW Greg Horner infoGleapaust com au 02 8966 7888 Canada Metal Forming Analysis Corp Chris Galbraith galb mfac com 613 547 5395 Bangalore Nelson Dias info inQaltair com 91 0 80 2658 8540 Italy EnginSoft Spa 39 055 432010 UK ARUP Solihull West Midlands Brian Walker brian walkerQarup com 44 0 121 213 3317 USA KBEC L C Austin TX Khanh Bui kdbui sbcglobal net 512 363 2739 USA SE amp CS Windsor CA Len Schwer len schwer net 707 837 0559 USA Predictive Engineering Corvallis OR George Laird 1 800 345 4671 george laird predictiveengineering com Structure Incorporated USA Todd L Peters Neenah WI www structuretechnology com 920 722 7060 ad info structuretechnology com FGAnformation com 36 Educational Contributing Participants Alphabetical Order By Country Dr Qing Zhou Tsinghua University Dr Anindya Deb Indian Institute of Science Prode Elasis amp Univ of Napoli Frederico II Dr Alexey Borovkov St Petersburg State Tech University Professor Gennaro Monacelli Ohio University Dr Ala Tabiei University of Cincinnati F EAnformation com 37 FEA Information China Participants Software Hardware Training Consulting Ser
14. With the production service you can e Tap into a complete by the CPU hour LS DYNA service e Pay only for the CPU hours reserved no long term financial commitment e Access industry standard Xeon Op teron and Itanium systems e Choose Linux Windows or Unix oper ating systems e Extend your in house LS DYNA re sources with HP FCS and your LS DYNA OS Pay As You Go Computing The LS DYNA HP Flexible Computing Ser vice is a pay as you go service There is no long term financial commitment neces sary You can use it once and pay only for the hours of service you reserved It is designed to extend and complement your in house LS DYNA resources Terms of offer Offer is valid for North America based LS DYNA commercial customers and is subject to qualifica tion Agreement with HP Flexible Computing Services and LS DYNA terms of use is required Introductory ses sion includes infrastructure OS and LS DYNA software as described Offer is subject to compute resources available at the time of request Agreement with additional terms is required with the purchase of production level LS DYNA HP Flexible Computing Services For more information or to sign up for this offer go to http www hp com services flexiblecomputing and click on Reque si Information on Flexible Gompuing Senices F EAnformation com FEA Publication Abstract Complete Article is posted on FEA Publications side bar link Feature
15. at of the blank FGAnformation com 5 The parameter 1 way invokes this modeling assumption only the blank can change temperature due to contact The suffix FRICTION added to the keyword CONTACT option THERMAL FRICTION adds the ca pability to model the mechanical coefficients of friction as a function of temperature and the thermal con tact resistance as a function of interface pressure There are currently 4 formulas to calculate the contact resistance h as a function of interface pressure P 1 load curve h P 1s defined by a load curve 2 polynomial h p a bP cb dP ak P 0 8 3 Shvets formula 2 h P 1 d 42 O d 4 ellers f T l 3 h L ai JI S ormuia C Other formulas will be added in the future MAT_113 4 and Thermal User Subroutine Material type 113 applies to shell elements only It features a special hardening law aimed at modeling the temperature dependent hardening behavior of TRIP steels TRIP stands for Transformation Induced Plasticity The material gains ultra high strength through the hot forming process In this material a phase transformation from austenite to martensite occurs during forming an effect which 1s sensitive not only to the stain level but also to strain rate and temperature The material model is composed of 2 basic equa tions 1 B B OV l V 1 TRIP kinetics rate equation Bop 2 gt VAS La tanh C DT CE A TA Y 2 2 yield stress equation o
16. ay announced that it will exhibit cutting edge products and services for Next Generation Net working NGN at ITU TELECOM WORLD 2006 the international networking exhibition to be held December 4 8 in Hong Kong Sales Training Consulting Benchmarks Er Infinite Simulation Systems B V e EE tienes ng Altair Engineering India een EE YANN Flotrend Corporation l g Siae Unitary Enterprise State Unitary Enterprise STRELA bf Korean Simulation Technologies FGA nformation com Hardware Computing Communication Products Logo s hyperlink to company s website AMD sgi Microsoft Gi FUJITSU RER SS E n zi FGA nformation com Software Distributors Alphabetical order by Country Australia Canada China China China Germany Germany India Italy Japan Japan Japan Korea Korea Leading Engineering Analysis Providers Metal Forming Analysis Corporation ANSYS China Arup MSC Software China CAD FEM DynaMore Altair Engineering India EnginSoft Spa Fujitsu Limited The Japan Research Institute CRC Solutions Corp Korean Simulation Technologies Theme Engineering 33 F information com 34 Software Distributors cont Alphabetical order by Country ZO Infinite Simulations Sysbems B V e Netherlands State Unitary Enterprise STRELA Engineering Research AB Flotrend Corporation USA Engineering Technology Associates Inc
17. control over deletion of degenerated elements 01 Dec Added a few Animated Demos to the Tutorials section 26 Nov Added scroll wheel zooming as a standard Mouse Operation 22 Nov Added some Mini Tutorials to address specific topics 16 Nov Added asksave option to Configuration File 15 Nov Added Save Keyword As option to File Menu to standardize file save behavior FGA nformation com SC LSTC Training Classes 2007 Classes The California office training center ac commodates 23 students The Michigan office has capacity for 12 students Classes are scheduled throughout the year at both locations For the most current schedule visit 132Hwww lstc com California June 26 29 SR Sept 25 28 Training Classes Advanced LS DYNA for Impact Analysis Advanced Options in LS DYNA 750 March 20 21 Sept 06 07 ALE Eulerian 6 Fluid Structure Interaction in LS DYNA March 13 16 June 05 08 Sept 11 14 Composite Materials We are in the process of scheduling all the classes As of today we have Concrete and Geomaterial Modeling with LS DYNA Contact in LS DYNA Heat Transfer 6 Thermal Stress Problems Implicit Feb 06 09 Introduction to LS DYNA May 01 04 750 Classes are continued on Next Page FGAnformation com 23 LSTC Training Classes 2007 Classes Continued LS DYNA for Heat Transfer 500 6 Thermal Stress Problems Material Modeling Using LS DYNA User Defined Options P730 Ree E MESH Free Me
18. d Initial Penetrations in Contact I nterfaces Suri Bala Copyright O 2006 Livermore Software Technology Corporation 1 Introduction Contact definitions allow the modeling of interaction between one or more parts in a simulation model and have become a necessity in any small or large deformation problem The main objective of the contact interfaces is to eliminate any overlap or penetration between the interacting surfaces and they accomplish this by first detecting the amount of penetration and then applying a force to remove them Depending on the type of algorithm used to remove the penetration both energy and momentum is conserved This article discusses the presence of penetration in non tied penalty based contact interfaces during the initialization of the problem usually termed as initial penetration Its effects on the accuracy robustness of the model and how LS DYNA has features that can minimize its adverse effects 2 Detecting Penetrations In order to detect the penetration due to contact LS DYNA first performs a global search using the Bucket Sort approach and then a local search using the incremental search technique to find the closest master segment for any given slave node or a segment Once a closest segment is found it projects the slave nodal coordinates onto the closest master segment to compute its orthogonal distance This is shown in Figure 1 The projected normal dis tance is computed using
19. d in a way that the thermal units are in joules and watts This is not the case for Unit Set 2 Although Unit Set 2 is consistent the thermal units are not familiar 2 Use the SI unit for thermal energy the joule and define the mechanical equivalent of heat to con vert the mechanical work unit into joules This is done for Unit Set 3 The mechanical equivalent of heat is entered in the CONTROL THERMAL SOLVER keyword Hot Forming Process The hot forming process has 5 steps 1 1 Austenization gt The blank is heated and held at the austenization temperature of 950C 2 Transfer gt The blank cools by convection and radiation during transfer from the oven to the forming press 3 Positioning gt The blank is placed on the lower die and begins to cool due to contact with the colder die 4 Forming gt The blank is formed 5 Quenching gt The blank is held in the press and cooled to induce a solid solid phase transition from austenite to martensite FGA nformation com 4 1 Austenization 2 Transfer 3 Positioning 4 Forming 5 Quenching eg Thick Thermal Shell The blank 1s modeled by a thin mechanical shell and flagged to be treated as a thick thermal shell by the parameter TSHELL on the CONTROL sSHELL keyword The thick thermal shell is a 12 node element 4 nodes in the plane of the shell and 3 nodes through the thickness The 3 nodes through the thickness allow the use of quadratic shape functions to more accuratel
20. elected using ADPOPT in PART keyword Only tetrahedron remeshing is supported and the initial mesh CAN be a composed of brick or wedge elements Subsequent remeshing will only be done using 4 noded tetrahedron elements Parameters for controlling the remeshing algorithm can be specified using the CONTROL REMESHING keyword Choosing the min and max element edge lengths that are close to the initial mesh may be a good start with min max range flexible enough for remeshing Few additional notes Nodes of the part being remeshed must not be used in any references and the use of BOX or SET PART is recommended The part must be an isolated part since new nodes created due to the remeshing process would detach the adjacent component if it had any shared node with its neighbors Element formulation Type 10 is recommended but if the initial mesh is composed of elements other than tetrahedron elements CONTROL RIGID must be used with ESORT 1 to toggle automatic sorting of elements based on type so the correct element formulation is chosen Beginning with Version971 you can export the time history data for mass and CG global or part level and it is highly recommended to output these parameters for the remeshed part to ensure conservation of mass and volume Question Sliding Interface energy for single surface contact definition am trying to track the rubbing work done on a contact definition as shown below The SLEOUT ASCII file en
21. ergies for this definition seems to be nonsense when look at the energy history in LS PREPPOST Other contact definitions in my model are producing good output contact eroding single surface 777 2 3 3 20 029 1 1 1 0 1 1 contact_single_edge VAT y 3 3 20 029 1 1 1 11 FGAnformation com 12 l recall reading but cannot find this again so might be wrong that single surface definitions require further cards to track the sliding work done Does anyone know where this information is found Reply by Jim Kennedy Perhaps this may be of some interest Reminder the sliding interface energy DATABASE SLEOUT requires a flag on the CONTROL_ENERGY keyword If you have more than one contact defined the SLEOUT file DATABASE SLEOUT will report contact energies for each contact When specifically looking for certain contact forces energy of defined segments where physical contact occurs you might consider CONTACT TRANSDUCER PENALTY CONTACT TRANSDUCER CONSTRAINT These contacts will allow you to obtain contact forces energy however no force is applied to the model even though it is a contact definition also suggest that you look at Chapter 5 0 Contact Output of Suri Bala s notes Bala Suri Contact Modeling in LS DYNA Parts 1 2 3 and 4 Livermore Soft ware Technology Corporation 2001 August September October December 2001 FEAInformation Newsletters http www fea
22. ever few months no small testament to the rapidly growing popularity of LS DYNA The group currently averages about 200 message per month i e about 7 message per day You can subscribe to the group by send ing an email request to LS DYNA subscribe yahoogroups com or by visiting the Yahoo Groups web site http groups yahoo com Generally the quickest best responses are to those questions posed with the most specifics General questions such as How do use XXX feature either go unan swered or are answered by Jim Kennedy with links to appropriate references in the growing LS DYNA related literature e g see the archive of LS DYNA Conference proceedings at www dynalook com 14 FGA nformation com 15 New Distributor of the Oasys pre and post processing software and FE models in India Arup is pleased to announce the appoint ment of nHance Engineering Solutions Pvt Ltd as a distributor of the Oasys software and FE model products in India ER mm F r nHance Engineering Solutions Pvt Ltd was established in 2004 to provide software development resources to Oasys and to Arup divisions Over the last two and half years nHance s team has grown to 14 members in size and the team s involve ment has spread to all aspects of software development and to all Oasys structural geotechnical and document management products A recent addition is the start of a small team to work with and distribute the Oasys pre and pos
23. iables for the Euler ALE solid elements are strains Thus in that case density will be the 6 1 7 history variable It s sometimes more clear to view iso surfaces of Eulerian history variables rather than fringes click on the FRIN button and choose ISOS Question Extra history variables for different material models Does anyone know the meaning of extra history variables for MAT22 and MAT59 As far as know the LS DYNA manual only defines those post processing variables for MAT54 55 Reply by Jim Kennedy The MAT O22 information is on Page 20 92 of the LS DYNA Version 970 User s Manual recommend getting a copy of the LS DYNA Version 971 User s Manual for this ad ditional information http www dynamax inc com download htm The meaning of the extra history variables for MAT O22 are given on Page 23 106 of the LS DYNA Version 971 User s Manual As for MAT 059 you will have to follow the advice in the note further down in this message In the table provided on Pages 23 1 to 23 6 of the LS DYNA Version 971 User s Manual for each material the number of history variables is listed The following note offers some discussion on extra history variables which hopefully will be of some help http www dynasupport com Support howto ale history variables 13 F EAnformation com LS DYNA Yahoo Groups There are over 2037 subscribers from all over the world and this list seems to grow by a hundred new subscribers
24. iversity was established in April 2000 and is a joint product of the former Computing Center CC and related departments of Osaka University The center has continually deployed computing systems of the highest levels and provided computational resources for large and high speed calculations to researchers in a wide range of areas NEC to Provide Largest SX 8R Supercomputer System in Japan to Osaka University s Cybermedia Center across Japan resulting in significant achievements in large scale simulations in multiple and varied fields CMC has highly evaluated NEC s system for its user friendly programming realized by high sustained performance and large scale shared memory which has been proved on benchmark tests with the user s actual applications Recently cluster systems which consist of many CPUs connected in parallel have shown a great improvement In performance achieving well in areas such as molecular science semiconductor design structural analysis and bio informatics However in the areas of fluid and particle analysis vector Supercomputers continue to demonstrate absolute dominance in terms of CPU performance and calculation efficiency when compared with cluster systems In addition efficiency improvement in power consumption and installation make vector Supercomputers superior in operation cost to that of cluster systems FGA nformation com NEC launched sale of the world s fastest commercial vector su
25. mpetitive edge by improving productiv ity through fast reliable simulation in an easy to use next generation Windows Vista desktop environment Complete Announcement MSC Software FGAnformation com 20 5th German LS DYNA Forum The German LS DYNA Forum was a great success 260 visitors attended the conference on the various LS DYNA applications In total more than 80 papers were presented on LS DYNA LS OPT and LS PrePost The presentations were given by users from OEMs Audi BMW DaimlerChrysler Ford Opel Porsche Toyota Auto Body Volkswagen And Suppliers Engineering Services Companies Research Institutes Universities The program can be downloaded at http www dynamore de download af06 inv_V1b_ e web pdf The papers can be downloaded at http www dynamore de event af06 con event agenda php FGAnformation com 21 LS PrePostG Online Documentation News Update www istc com Ispp Copyright LSTC Online documentation is provided by the developers of LS PrePost and is continually up dated LS PrePost as well as LS OPT are delivered with LS DYNA at no additional fees LS PrePost is an advanced pre and post processor The user interface is designed to be both efficient and intuitive LS PrePost runs on Windows Linux and Unix utilizing OpenGL graphics to achieve fast rendering and XY plotting What s New in LS PrePost 10 Dec Added Delete Degenerated Elem option to DupNod Interface to allow
26. percomputer SX 8R in October 2006 The SX 8R boasts a peak vector performance of 144 TFLOPS and demonstrates high performance in the areas of automotive performance weather forecasts and environment simulations where large scale large capacity data calculations are required About NEC Corporation NEC Corporation NASDAQ NIPNY is one of the world s leading providers of Internet broadband network and enterprise business solutions 17 dedicated to meeting the specialized needs of its diverse and global base of customers NEC delivers tailored solutions in the key fields of computer networking and electron devices by integrating its technical strengths in IT and Networks and by providing advanced semiconductor solutions through NEC Electronics Corporation The NEC Group employs more than 150 000 people worldwide and had net sales of approximately 4 825 billion yen approx 41 2 billion in the fiscal year ended March 2006 For additional information please visit the NEC home page at http www nec com http www nec co jp press en Newsroom FGAnformation com 18 December s Introduction Web Page excerpt VPG developed by ETA www eta com eta VPG provides an efficient and comprehensive environment for development of finite element models In addition YPG delivers a unique set of tools which allow engineers to create and visualize advanced simulations for vehicle crashworthiness and dynamic durahill
27. publications com pages feanews2 shtm i An example of the suggested transducer data structure is given in Chapter 23 2 Contact Definitions see Page 23 17 of the following guide Weimar K LS DYNA User s Guide CAD FEM GmbH Rev 1 19 September 2001 http portal ecadftem com fileadmin files lsdyna website pdf pdf Isdyna Users Guide pdf Question Why the fluid does not move use LS DYNA to simulate a cylinder of water impacting an elastic material But to my surprise the water did not move as expected hope can get your help Reply by Jim Kennedy If you are having trouble with visualization with a recent LS PREPOST executable you can view the Euler ALE materials in a convenient manner by selecting SELPAR gt FLUID You can also view the Euler ALE materials using FCOMP gt MISC gt HISTORY VAR F EAnformation com HISTORY VARIABLE 1 density 2 volume fraction of 1st multi material group formulation 11 or single Eulerian material formulation 12 3 volume fraction of 2nd multi material group formulation 11 etc If n is the number of multi material groups then history variable n 2 is a com ponent that identifies the various multi material groups by assigning a value of 1 0 to those cells comprised predominantly of multi material group 1 2 0 to those cells comprised predominantly of multi material group 2 and so on If STRFLG is set to 1 strains are saved the first six extra history var
28. ssor for the worlds most respected ex plicit dynamics solver LS DYNA The combination makes it possible to solve combined explicit implicit simulations in a very efficient manner as well as per form extensive coupled simulations in Robust Design by using mature struc tural thermal electromagnetic and CFD technologies Al Environment A high end pre and post processor for LS DYNA Al Environment is a powerful tool for advanced modeling of complex struc tures found in automotive aerospace electronic and medical fields Solid Shell Beam Fluid and Electromagnetic meshing and mesh editing tools are in cluded under a single interface making Al Environement highly capable yet easy to usefor advanced modeling needs ETA DYNAFORM Includes a complete CAD interface capa ble of importing modeling and analyz ing any die design Available for PC LINUX and UNIX DYNAFORM couples af fordable software with today s high end low cost hardware for a complete and affordable metal forming solution ETA VPG Streamlined CAE software package pro vides an event based simulation solution of nonlinear dynamic problems eta VPG s single software package over comes the limitations of existing CAE analysis methods It is designed to ana lyze the behavior of mechanical and structural systems as simple as linkages and as complex as full vehicles MSC Software MSC Dytran LS DYNA Tightly integrated solution that combines M
29. t processing soft ware for LS DYNA OASYS LS DYNA FE Models Arup has developd correlated LS DYNA models of barriers and pedestrian impac tors for various automotive test simula tions These models are used widely in the automotive industry ETI ian Lee Oasys LS DYNA Environment Arup s software for use with LS DYNA consists of PRIMER pre processor D3PLOT and T HIS post processors and REPORTER automatic report generation We also produce a graphical user interface for submitting and monitoring jobs called the Oasys SHELL T EE i Contact Information Lavendra Singh NHance Engineering Solutions Pvt Ltd 91 0 40 23544420 28 lavendra singh arup com www arup com FGA nformation com 16 December Chosen Press Release Tokyo November 7 2006 Tokyo November 7 2006 NEC Corporation NEC announced the purchase of a large scale supercomputer system consisting of 20 SX 8R vector Supercomputers by the Cybermedia Center CMC at Osaka University The new system achieves a peak performance of 5 3 TFLOPS and will be the largest SX series system acquired in Japan CMC plans to add a next generation SX system in two years whose peak performance is expected to exceed 20 TFLOPS one trillion floating point operations per second a performance enhancement of 16 times that of the current system of SX 5 12M8 peak performance 1 280GFLOPS The Cybermedia Center at Osaka Un
30. thods in LS DYNA 750 SPH and EFG FGAnformation com 24 EVENTS 2006 If you want your event listed please send the information to mv feainformation com 2007 otn European May 28 29 6th European Sweden July 23 26 Ninth US National Congress on Computational Mechanics San y Francisco CA USNCCM IX on ODEN i LS DYNA Users Meeting Germany hosted by DYNAmore 2008 June 8 10 oe SE Japan LS DYNA Users Conference 2007 hosted by JRI 8th International Users Conference Dearborn Mi US F EAnformation com LS DYNA Resource Page Interface Hardware OS And General Information Participant Hardware OS that run LS DYNA alphabetical order LS DYNA has been fully QA d by Livermore Software Technology Corporation for All Hardware and OS listed below TABLE 1 SMP TABLE 2 MPP Interconnect and MPI TABLE 1 SMP Fully QA d by LSTC AMD Opteron FUJITSU Prime Power FUJITSU VPP HP PA 8x00 HP Opteron IBM Power 4 5 IBM Power 5 INTEL 1A32 INTEL 1A64 INTEL Xeon EMT64 SGl Mips SGI 1A64 SUSE 9 with ProPack 4 Red Hat 3 with ProPack 3 25 F EAnformation com LS DYNA Resource Page MPP Interconnect and MPI FEA Information Inc Participant s alphabetical order Fully QA d by Livermore Software Technology Corporation AMD Opteron FUJITSU Prime Power SUN OS 5 8 FUJITSU VPP HP PA 8x00 HP Opteron HP Alpha IBM Power 4 5 IBM Power 5 INTEL 1A32 INTEL 1A64 INTEL Xeon EMT6
31. thur B Shapiro LS 971 has several new features to model the hot stamping process A thick thermal shell formulation allows modeling a temperature gradient through the thickness of the shell The new keyword MAT ADD THERMAL EXPANSION allows calculating thermal strains for all the mechanical mate rial models A new feature has been added to thermal contact which turns off thermal boundary condi tions when surfaces come in contact A new thermal one way contact algorithm has been added which more accurately models heat transfer between a blank and die New features have been added to thermal mechanical contact which allows modeling the coefficients of friction as a function of temperature and thermal contact resistance as a function of interface pressure Units A consistent set of units must be used in performing a coupled thermal mechanical analysis Problems arise due to a mismatch between the mechanical unit for work and the thermal unit for energy SI presents a consistent set of units to perform a coupled thermal mechanical analysis However units are typically chosen based on historical practice in the industry Table presents typical units used for metal stamping There are 2 approaches that can be taken to satisfy the requirement of a consistent set of units 1 Convert the thermal units into the base units being used for the mechanical problem This is done for unit sets 1 and 2 in Table 1 The mechanical units for Unit Set 1 are define
32. ty VPG is delivered to users in 3 modules VPG PrePost Provides a wide range of tools that can be used to efficiently create meshes on CAD data using an advanced automeshing algorithm which eliminates most manual mesh manipulation The results better quality models in a fraction of the time VPG Structure VPG enables users to create unique system level simulations of mechani cal systems such as vehicle suspensions and linkages VPG enables users to include com ponents as flexible bodies combining the traditional kinematic dynamic simulation meth ods with finite element analysis methods The results are simulations that provide greater insight and opportunities to improve or prove out your design VPG Safety With a complete dummy library barrier library and airbag folding system VPG enables users to quickly and painlessly set up complex simulations for standard vehi cle impact simulations The Process Guidance approach to process automation delivers the flexibility that is needed by users with a streamlined model creation VPG users can quickly and reliably create simulation models that previously took a great deal of expertise and time to create For futher information on eta VPG Features and Modules visit www eta com Or contact eta VPG Tim Palmer Tel 1 248 729 3010 x 239 Email toalmer eta com F EAnformation com December Industry News excerpts Alpha Order Fujitsu PRIMERGY Servers Powered by Quad Core
33. vices l Name Li YuQiang Arup China LS DYNA Email Yu qiang li arup com sales support training Tel 021 5396 6633 extn 151 Tel 86 10 84085558 Website www ansys com cn Contact China ansys com cn Ansys China Inc Kimbal Virdi Tel 86 21 5396 6633 Arup Contact Kimbal virdi arup com Website www arup com dyna Tel 86 10 82561200 01 03 Website http cpc ytforever com Beijing Yuntong Forever CPC Sole Distributor of LINUX NETWORX INC USA in Co Ltd China Contact service ytforever com Martin Ma Engineering Technology Asso Tel 86 21 64385725 ciates China Inc Contact supportQeta com cn Jerry Huang Hewlett Packard Tel 86 10 65645261 Asia Pacific Ltd Contact Huang hp com Ms Ling WANG Tel 86 10 6539 1188 x4463 T L 901 4463 IBM China Website http www ibm com cn Contact wanglingQcn ibm com Tel 86 10 6849 2777 Website www mscsoftware com cn Contact mscprc contactamscsoftware com MSC Software Corp FAnformation com 38 FEA Information China Participants Software Hardware Training Consulting Services Carl Zhang SGI Tel 86 10 65228868 Ext 3362 Contact carl sgi com Qing Zhou PhD Professor Tsinghua University Department of Automotive Engineering Beijing 100084 China Larry Liang Zhongfang Information Tel 86 21 54973162 Technology Ltd Website http www cntech com cn Contact info cntech com cn Yang Xiaojum Zhong Guo E
34. y calculate the through thickness temperature gradient LS PrePost can display temperatures on the mid plane bottom surface and top surface of the shell MAT ADD THERMAL_ EXPANSION The coefficient of thermal expansion as a function of temperature can be defined using the MAT ADD THERMAL EXPANSION keyword This allows the calculation of thermal strains for any of the mechanical material models in LS DYNA LS DYNA requires the tangent value of the coefficient of expansion as defined in the following figure Be Tangent coefficient of thermal expansion is used by LS DYNA thermal straln En ALIL Secant coefficient of thermal expansion requires a reference lemperature Ta Ty Ta temperature Thermal Mechanical Contact Two new features have been added to the CONTACT option THERMAL keyword 1 bc_flag gt During the transfer operation from the oven to the press both surfaces of the blank lose heat to the environment However once the blank is positioned on the lower die only the top sur face of the blank transfers heat to the environment Setting bc_flag 1 turns off thermal boundary conditions for those surfaces that are in contact 2 1_way gt In the mechanical definition of the problem the dies are typically modeled using a rigid material Therefore the dies do not deform Analogously for the thermal definition of the prob lem the dies do not change temperature because their mass 1s much greater than th
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