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FEA Newsletter October 2006

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FEA Newsletter October 2006 OCTOBER 2 0 0 6 6 TH Anniversary Issue IN F O R M ATI O N WWW.FEAINFORMATION.COM PRODUCT SPOTLIGHT Interfacing ANSYS Workbench and LS-DYNA® ANALYSIS SPOTLIGHT PREDICTIVE ENGINEERING Extreme Implicit Nonlinear Analysis of Plastic Thread Design HARDWARE SPOTLIGHT InfiniPath™ InfiniBand™ Interconnect BUILT ON A UNIQUE HYPERMESSAGING ARCHITECTURE™ FEA INFORMATION RESOURCE MAGAZINE FeaInformation.com 1 FEA Information Worldwide Participants Contents 01 Index 02 FEA Announcements 03 LS-DYNA: Extreme Implicit Nonlinear Analysis of Plastic Thread Design 05 ANSYS: Interfacing ANSYS Workbench and LS-DYNA 07 HP Benchmark Results on Top Crunch 08 LS-PrePost 09 Yahoo Yammerings 14 Intel: Parintins Is An Island in the Amazon 16 Qlogic: Interconnect Built On A Unique Hypermessaging Architecture 18 Publication A Coupled Thermal and Mechanical Model of Sliding Wear 19 FEA Weekly News Page – September Highlights 20 LSTC Training Classes 21 EVENTS 22 LS-DYNA Resource Page 28 Hardware & Computing and Communication Products 29 Software Distributors 31 Consulting and Engineering Services 32 Educational & Contributing Participants 33 China Participants 35 Informational Websites 36 6th European LS-DYNA Conference SGI: Whatever Your Environment. There’s and SGI server that can keep your 37 data moving Editor: Technical Writers: Trent Eggleston Dr. David Benson Managing Editor: Uli Franz Marsha Victory Dr. Ala Tabiei Technical Editor: Suri Bala Art Shapiro Technical Consultants: Graphic Designer: Steve Pilz Wayne L. Mindle Reza Sadeghi FeaInformation.com 2 FEA Information Announcements Our 6th Anniversary Celebrating our Anniversary: October marks our 6th year Anniversary. Our first edition was pub- lished October 2000 and can be found archived on FEA Publications – sidebar link “FEA News” We would like to thank all of our participants, writers, contributors and the worldwide community of engineers for making this publication and websites a success. TRAVEL: October 25-27 Marsha Victory, will be attending: 2006 CADFEM Users Meeting International Congress on FEM Technology - Stuttgart area - Germany If you are attending please make time to say hello. Sincerely, Trent Eggleston & Marsha Victory 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 FeaInformation.com 3 Extreme Implicit Nonlinear Analysis of Plastic Thread Design All analysis work was done with LS-DYNA V971. © Copyright George Laird, Predictive Engineering, Predictive Engineering The genesis of this project came about to original consultant's work. This was validate a prior consultant's work depressing since the experimental work indicating that the thread design of a new indicated a 2x load factor and I knew that device would fail exactly at the design LS-DYNA could do better. Digging in and load of the instrument. Since the company making several calls to the technical had experimental data which strongly support staff at LSTC, a recommendation indicated a failure load of 2x the design was made to use *MAT PLASTICITY load there was a whirlwind of debate as to COMPRESSION TENSION (*MAT 124) whether to proceed to mass production or along with several other tweaks to the conduct an extensive redesign campaign. implicit solver routine. The utility of this Although I entered this project with high material model is that one can use confidence I soon realized what a different stress/strain curves and failure quagmire I had entered. Initially I thought limits for compression and tension. This the analysis work could be accomplished was absolutely fantastic for the plastic using a standard implicit nonlinear code material used for the thread design since and after a few days of frustrating the failure stress for the plastic under keyboard pounding I soon realized that I compression is about 3x higher than that needed more horsepower. I was against for tension. With these changes in place, the wall and it was time to pull out the big the LS-DYNA model predicted a failure guns: LS-DYNA. Initially I was a bit load of 2x the design load. This was very hesitant to use LS-DYNA since I wanted to gratifying since the material stress/strain maintain the analysis procedure within the curves were not "adjusted" and were used implicit world and historically LS-DYNA straight out of the gate. was a bit weak on the implicit side. Well, welcome to 2005 and V971 of LS-DYNA. Based on my experience with this project and prior experiences, I can clearly state that LS-DYNA has made great strides in the implicit realm. That is to say, LS- DYNA has always been dominant on the explicit side while its implicit capabilities were considered more of a sub-set. At the end of this project, the client was able to rest assured that the design was robust and we also learned many other cool things about plastic thread design, but they are of course, proprietary. Initially, the LS-DYNA results for the thread design matched up with the FeaInformation.com 4 capture the mechanical response of the device. The model was carefully meshed to obtain a fine grid of 8-node brick elements. Contact elements and other analysis specific tweaks were done within LSTC’s LSPOST (a pre- and post-processor for LS-DYNA). A complete implicit analysis run would take about 5 minutes on a standard single-processor Intel PC. The material model was *MAT 124 and data was derived from tensile test data provided by the client. Compression test data were inferred from theory and Modeling Notes: The 3-D geometry was general data trends for this material. The provided in the form of a Pro/E STEP file model was run to the failure point of the and imported directly into Femap V9.0.1. plastic. The model exploited the geometric and loading symmetry of the structure and only a 5 degree segment was required to Predictive Engineering is a mechanical engineering consulting company specializ- ing in finite element analysis (FEA). Under this banner, a broad range of capabilities are brought to bear in developing predictive engineering models via expertise in thermal/fluids (CFdesign), drop-testing and impact analysis (LS-DYNA), and static/dynamic/nonlinear/thermal structural analysis software FeaInformation.com 5 Interfacing ANSYS Workbench and LS-DYNA® © CADFEM GmbH - Dr.-Ing. Matthias Hoermann ANSYS Workbench enables users to solve the most diverse analysis tasks in the same standard user interface. The new interface “Workbench LS-DYNA” devel- oped by CADFEM gives users access to LS-DYNA®´s unique highly dynamic, non- linear analysis capabilities within the Workbench environment. Numerical Simulations as integral part in LS-DYNA the virtual product development process exhibit a huge spectrum. Ranging from LS-DYNA is extremely strong in areas simple modal analyses over linear and where large, non-linear issues and short- nonlinear stiffness and strength based time dynamics are relevant. In product problems up to coupled multiphysic analy- development, the demand for transient, ses, where different physical disciplines strongly non-linear analyses, e.g. drop interact with each other. tests, buckling and load limit analyses, is rising strongly. A complex contact defini- Since they complement each other so tion, coupled with high frequency, time well, ANSYS Workbench and LS-DYNA de- transient stress wave propagation in the liver unrivaled excellence in covering a component, is of vital importance in vir- huge number of current FEM simulation tual drop testing. Furthermore, dealing tasks. with load limit analyses requires large element deformations and corresponding ANSYS Workbench non-linear material models, taking into account damage to the material with sub- ANSYS Workbench is a simulation sequent failure, too. platform that enables users to perform more product development tasks faster. Interface “Workbench LS-DYNA” With the Workbench environment, ANSYS took a quantum leap into model analysis An interface between ANSYS Workbench and handling different simulation disci- and LS-DYNA provides the opportunity to plines. Besides structural and fluid me- combine both programs. The German chanics tasks, it can also process coupled ANSYS and LS-DYNA distributor CADFEM phenomena (“Multiphysics”) such as elec- GmbH has thus created a unidirectional, tromagnetic thermal-mechanical effects interactive graphic interface for the trans- and fluid-structure interaction in the same fer of data from ANSYS Workbench to LS- standard user interface. DYNA. This not only enables users to transfer the pure structure in form of Besides its multi-tasking features, ANSYS nodes and elements, but sections, materi- Workbench also boasts seamless model als, contact definitions and boundary con- file transfer from and to almost all com- ditions, including prescribed motions and mon 3D CAD systems. It also handles as- force loading, too. LS-DYNA specific con- semblies with automatic mesh generation trol and database options will be included and automatic contact detection effi- from a template file, which can be cus- ciently. tomized by the user. FeaInformation.com 6 Advantages for LS-DYNA users Interface “Workbench LS-DYNA” on LS-DYNA users will benefit from this inter- the CADFEM Users’ Meeting 2006 face. With an existing ANSYS Workbench license and LSTC’s free of charge LS- The interface will be presented during a PrePost an additional preprocessor caus- two hour, afternoon workshop on ing cost and training effort may no longer Wednesday, October 25th at the 2006 be necessary. The interface also enables CADFEM Users’ Meeting to take place in easier data exchange with other analysis Stuttgart, Germany from October 25th to departments which are already using 27th, 2006.
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