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1. 18 A Coupled Thermal and Mechanical Model of Sliding Wear S S Akarca W J Altenhof and A T Alpas Department of Mechanical Automotive amp Materials Engineering University of Windsor 401 Sunset Avenue Essex Hall Windsor ON Canada N9B 3P4 Abstract Sliding wear of aluminum alloys induce plastic deformation below the contact sur faces even at light loads Experimental evidence exists for damage accumulation in the form of nucleation of voids and mi crocracks around the second phase parti cles in the material layers adjacent to the contact surface Crack propagation at a certain depth below the surface may lead to the creation of long and thin wear de bris particles The objective of this work was to study deformation and damage ac cumulation processes in aluminum alloys during sliding wear LS DYNA was used to model multiple sliding contacts between an aluminum alloy and a steel counter face The material model used in the finite element analysis was based on the stress strain behaviour of a 356 Al Al 7 Si alloy determined directly from the analysis of the deformation state of the subsurfaces generated during sliding wear tests Strain rate and thermal effects were also considered through a coupled thermal and mechanical analysis using material type 106 in LS DYNA MAT_ELASTIC_ VISCOPLASTIC_THERMAL The accumu lation of stresses and strains were studied as a function of contact cycle number The La
2. Please see the CMPFLG flag on the DATABASE_BINARY keyword on Page 9 21 of the LS DYNA Version 970 User s Manual At the following LS DYNA manuals download website http www cadfem de Manuals 1323 0 html you will find are three different LS PrePost User s manuals believe the information for viewing the material axes orientation is given on Pages 11 and 12 of the latest manual link given here http www cadfem de fileadmin files sdyna website pdf pdf_Isprepost Ispp_may_2 005 p df The following is part of a message 9394 posted April 7 2006 where provided an an swer to a similar question Perhaps this may be of interest and or help Yes it is possible to orientate materials following a specified material coordinate direction Please do not confuse the nodal element coordinate systems with the material coordinate systems where anisotropic and orthotropic material behavior can be addressed through material parameters and local or global material axes believe there is a large selection of materials that offer either anisotropic and or orthotropic material behavior Among these are MAT_002 MAT_021 MAT_022 MAT_023 MAT_026 MAT_033 MAT_034 MAT_036 MAT_037 MAT_039 MAT_040 MAT_054 55 MAT_058 MAT_059 MAT_81 82 MAT_086 MAT_099 MAT_103 MAT_104 MAT_116 MAT_117 MAT 122 MAT_122 MAT_126 MAT_128 MAT_130 MAT_142 MAT_143 MAT_161 162 MAT_179 did observe that one of the material axes option AOPT
3. MI MN MN FEAILNFORMATION COM PRODUCT SPOTLIGHT Interfacing ANSYS Workbench and LS DYNA Workbench ANALYSIS SPOTLIGHT PREDICTIVE ENGINEERING Extreme Implicit Nonlinear Analysis of Plastic Thread Design HARDWARE SPOTLIGHT J InfiniPath InfiniBand Interconnect BUILT ON A UNIQUE HYPERMESSAGING ARCHITECTURE PE FEA INFORMATION RESOURCE MAGAZINE F Ainformation com 1 FEA Information Worldwide Participants lt az Ds MET Sorrwane ARUP Contents O01 Index 02 EEA Announcements 03 LS DYNA Extreme Implicit Nonlinear Analysis of Plastic Thread Design 05 ANES 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 EEA Weekly News Page September Highlights 20 LSTC Training Classes 21 EVENTS 22 LS DYNA Resource Page 28 Hardware amp Computing and Communication Products 29 Software Distributors 31 Consulting and Engineering Services 32 Educational amp Contributing Participants 33 China Participants 35 Informational Websites 36 SI European LS DYNA Conference 37 SGI Whatever Your Environment There s and SGI server that can kee
4. Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand AMD Dualcore Opteron 64x2x1 2 6 GHz DL145 128 AMD Dualcore Opteron 32x2x2 2 6 GHz DL145 128 AMD Dualcore Opteron 32x2x1 64 2 6 GHz DL145 AMD Dualcore Opteron 16x2x2 64 2 6 GHz DL145 AMD Dualcore Opteron 24x2x1 48 2 6 GHz DL145 AMD Dualcore Opteron 12x2x2 48 2 6 GHz DL145 AMD Dualcore Opteron 16x2x1 32 2 6 GHz DL145 AMD Dualcore Opteron 8x2x2 32 2 6 GHz DL145 AMD Dualcore Opteron 12x2x1 24 2 6 GHz DL145 AMD Dualcore Opteron 6x2x2 24 2 6 GHz DL145 AMD Dualcore Opteron 8x2x1 16 2 6 GHz DL145 AMD Dualcore Opteron 4x2x2 16 2 6 GHz DL145 AMD Dualcore Opteron 4x2x1 8 2 6 GHz DL145 AMD Dualcore Opteron 2x2x2 8 2 6 GHz DL145 AMD Dualcore Opteron 2x2x1 4 2 6 GHz DL145 AMD Dualcore Opteron 1x2x2 4 2 6 GHz DL145 AMD Dualcore Opteron lee x wz 2 6 GHz DL145 2624 3257 3797 4236 4383 5038 5883 6902 7346 8451 10402 12031 19111 22259 36505 42852 72477 3 Vehicle Collision 3 Vehicle Collision F information com LS PrePost Online Documentation News Update www lstc com Ispp Copyright LSTC This online documentation site is provided by the developers of LS PrePost and is continu ally updated LS PrePost as well as LS OPT are delivered with LS DYNA at no additional fees LS PrePost is an advanced pre and post p
5. 16 InfiniPath InfiniBand Interconnect BUILT ON A UNIQUE HYPERMESSAGING ARCHITECTURE Complete information can be found at http www qlogic com products Infini_Interconnect asp The InfiniPath family of adapters amp ASICs deliver industry leading performance in a cluster interconnect allowing organiza tions to gain maximum performance ad vantage and return from their investment in clustered systems InfiniPath yields the lowest latency the highest message rate and highest effective bandwidth of any cluster or storage interconnect available As a result organizations relying on clus tered systems for critical computing tasks will gain a significant increase in produc tivity The InfiniPath HyperMessaging Architec ture is the key to the InfiniPath per formance advantage delivering the high est message rate and highest effective bandwidth of any cluster interconnect available It allows InfiniPath to support over 10 million messages per second or 10X MR By achieving 10X MR InfiniPath delivers over 10 times more messages per second than any other cluster intercon nect Its unprecedented messaging rate also reduces network fabric congestion as the InfiniBand adapter will no longer be the network bottleneck InfiniPath Performance Summary e The world s most scalable and effi cient cluster interconnect o 1 29 Microseconds MPI La tency 0 byte 1 2 round trip o 88 byte message size to achieve
6. 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 F information 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 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 wor
7. direction and widths LS DYNA Yahoo Groups There are over 1950 subscribers from all over the world and this list seems to grow by a hundred new subscribers ever few months no small testament to the rapidly growing popularity of LS DYNA The group currently averages about 200 mes sage per month i e about 7 message per day You can subscribe to the group by sending 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 specif ics General questions such as How do use XXX feature either go unanswered or are answered by Jim Kennedy with links to appropriate references in the growing LS DYNA re lated literature e g see the archive of LS DYNA Conference proceedings at www dynalook com F information com October s Chosen Press Release 14 Parintins Is An Island in the Amazon Intel Chairman Unveils The World s Most Remote Digital City Amazon Effort Marks Global Movement to Bring Technology to the Next Billion People PARINTINS Brazil Sept 20 2006 In one of the most remote inhabited places on Earth the Amazon Intel Corpo ration has created a wireless high speed Internet network for residents to access vast resources of medical educational and commercial knowledge through com puters The project is part of the Intel World Ahead Program an initiative in whic
8. Femap V9 0 1 The model exploited the geometric and loading symmetry of the structure and only a 5 degree segment was required to 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 general data trends for this material The model was run to the failure point of the plastic 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 F information com 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
9. Intel Dual Core Xeon 5100 proc essor architecture the value priced SGI Altix XE line makes expanding your capa bilities easy and affordable e Industry standard Linux supports a wide range of 32 and 64 bit applications e High density clusters for unmatched energy and space efficiency e A choice of density optimized or O rich server options Custom configured factory integrated clusters for flexible easy deployment Introducing our latest SGI Altix 450 servers Manage every workload and scale with ease Built on the advanced Intel Itanium 2 processor architecture SGI s Altix server line speeds time to insight with powerful performance for even the most complex workloads e Uncompromised Linux performance and scalability e Leading energy and space efficiency for high demand applications e Proven reliability availability and serviceability e Low cost of development administration and management Get our new white paper to learn more A Multi Workflow Architecture for High Performance Computing 37
10. SPH nodes first you need to make a solid mesh and would like to know if there is any way to transform that mesh into SPH in an easy way use FEMB to create the solid mesh but my version does not have an option to transform solid elements into SPH nodes would like someone to tell me if there is any application or if someone could share any file to do that transformation Reply by Len Schwer think you will need to write your own script program to perform this task LS PrePost does have a Hex to SPH feature on Page 7 but cannot figure out how it works and the documentation leaves something to be desired http www lstc com Ispp content pages 7 sphgen sphgen shtml If you write your own script program the only challenge is to compute the volume of the standard hexahedral elements so you can calculate the mass to be partitioned to the SPH particles Follow up Reply by Akram Abu Odeh A little test had with LS PrePost LSPP and SPH First step is to input a model with at least a single solid elements part and a material de fined F Anformation com 11 Go Page 7 and click on SphGen On the Primary Controls buttons use the FromHeX as Len mentioned You should see a list of Part s in a square down on the Secondary Con trols panel Click on the Part that you want to convert to SPH The field that is prefixed with From should have your part now Then you need to type in the new part you wan
11. of miles apart give the town s 32 doctors faster and greater access to the latest medical data or sec ond opinions Telemedicine for us is like a new weapon a weapon from the future said Dr Gregorz Maciejewski municipal secretary of Health in Parintins Doctors say telemedicine will also help in preventing the spread of such diseases as AIDS and leprosy 15 The solution in the Amazon is to be fol lowed by others planned by Intel for iso lated communities in Africa Asia and the Middle East where electricity and tele communications are unreliable or anti quated and transportation is difficult The wireless infrastructure includes short range Wi Fi radio transmissions and Wi MAX which has an extended transmitting range of up to 30 miles WiMAX is de signed to be a less costly and more effi cient way to build wireless computing and communications networks for broadband access Intel the world s largest chip maker is also a leading manufacturer of computer networking and communications products Additional information about Intel is avail able at www intel com pressroom and at the Amazon Press Kit Intel the Intel logo Viiv Centrino and vPro are trademarks or registered trade marks of Intel Corporation or its subsidi aries in the United States and other coun tries Other names and brands may be claimed as the property of others F GAinformation com Webpage Informational Excerpt
12. 1 2 of peak band width streaming 8 CPU cores o 954 MB s peak uni directional bandwidth streaming o 583 MB s TCP IP throughput with 6 7 microsecond latency o 11 3 million messages sec eight CPU cores per adapter Note Performance measurements ob tained using InfiniPath HTX Adapter Complete info on InfiniPath performance can be found here InfiniPath also delivers industry leading OpenIB performance allowing applica tions using OpenlB protocols such as IPoIB and SDP to achieve maximum scal ability OpenlIB was developed by the OpenlB Alliance now called the Open Fabrics Alliance an industry association chartered to deliver a single open source software stack for deploying InfiniBand solutions The Open Fabrics Alliance founded in June 2004 is comprised of leading computer technology vendors and end user organizations It provides a sin gle open source standard that ensures interoperability between software stacks and hardware products F information com Based on a suite of industry standards InfiniPath achieves world class perform ance at a commodity price structure util izing standard InfiniBand switching fab rics With the InfiniPath interconnect ap plications deployed on Linux clusters can now efficiently scale to 1000 s of nodes InfiniPath InfiniBand Adapter Features and Specifications e Uniquely exploits multi processor nodes and multi core processors e Direct attach from Hyper
13. 4 offers an option that may be of interest F Anformation com 13 EQ 4 0 locally orthotropic in cylindrical coordinate system with the material axis deter mined by a vector v and an originating point P which define the centerline axis This op tion is for solid elements only Question Concrete Erosion Would anyone like to share his experience in using MAT_ADD_EROSION to simulate con crete cracking under compression Since there are multiple failure criteria in MAT_ADD_EODSION e g MXPRES MNPEPS EPSP1 etc which input controls the con crete s compressive failure Are there any input samples available Reply by Len Schwer Concrete s compressive failure is controlled by the constitutive model s shear failure sur face Typically the only time to use MAT_ADD_EROSION is when you want to remove elements from a calculation e g during a penetration simulation do not think MAT_ADD_EROSION can be used to simulate the physical cracking that oc curs during compression unless you have a very fine mesh with element sizes on the order of the crack width If you want to try MAT_ADD_EROSION criteria suggest the strain criteria as the stress is already limited by the shear failure surface For cracks would think a maximum princi pal strain criteria would be the first thing to try You might also have a look at MAT084 085 MAT_WINFRITH_CONCRETE which generates an additional binary file with crack location
14. QLogic InfiniPath FUJITSU Prime Power FUJITSU VPP Unix_System_V HP PA8000 HPUX SUN OS 5 8 HP Alpha True 64 IBM Power 4 5 JAIX 5 1 5 2 5 3 IBM Power5 SUSE 9 0 LAM MPI InfiniBand Voltaire LAM MPI MPICH HP INTEL IA32 Linux Windows MyriCom MPI SCALI MTE AEA Uu SEO MPICH HP InfiniBand Topspin Voltaire LAM MPI MPICH HP a GE MyriCom MPI INTEL MPI QLogic InfiniPath SCALI NEC SX6 Super UX SGI Mips IRIX 6 5 NUMAlink SUSE 9 w ProPack 4 SGI IA64 RedHat 3 w ProPack 3 NUMAlink InfiniBand Vol MPT Intel MPI taire MPICH F information com 25 LS DYNA Resource Page Participant Software I nterfacing 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 cessor 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 technolo
15. Transport HTX slot or a PCI Express x8 slot to InfiniBand 4X switch e Interoperable with InfiniBand switches and HCA s from Silver Storm Mellanox Microway Cisco amp Voltaire e Built around industry standards o HyperTransport PCI Express InfiniBand OpenlB MPICH o Linux e Deployment options include both motherboard and adapter card so lutions O O O O 17 o InfiniPath ASIC can be de ployed on a motherboard or daughtercard o InfiniPath HTX Adapter plugs into a standard HTX slot o InfiniPath PCI Express adapter plugs into a standard PCI Express x8 slot The innovative InfiniPath HyperMessaging Architecture allows your current applica tions to run faster and scale to unprece dented levels improving the time to results for complex computational chal lenges InfiniPath also provides invest ment protection since new applications can be developed and deployed on very large clusters without the bandwidth latency or message rate limitations in curred by traditional interconnects as you scale to larger and larger systems By al lowing you to drive up the utilization of your computing infrastructure InfiniPath increases the ROI of your data center as sets Try Before You Buy Register to test your applications in the PathScale Infini Path Benchmark Center Data Sheets can be located on line F information com Publication Showcase Paper is located online FEA Publications Sidebar Link Featured
16. U ERC NSM Dr Ala Tabiei University of Cincinnati usa Dr David Benson University of California San Diego F Ainformation com 33 FEA Information China Participants Software Hardware Training Consulting Services Arup Name Li YuQiang China LS DYNA sales Email Yu qiang li arup com support training Tel 021 5396 6633 extn 151 Tel 86 10 84085558 poste Eite Ine Website www ansys com cn y gor Contact China ansys com cn Kimbal Virdi Tel 86 21 5396 6633 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 support eta 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 wangling cn ibm com Tel 86 10 6849 2777 Website www mscsoftware com cn Contact mscprc contact mscsoftware com MSC Software Corp F information com 34 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 o
17. access to wire less Internet is a great pleasure for us This project will prepare this generation for the future Intel led the effort in the island city on the Amazon River with support from Cisco CPqD Embratel Proxim and the Bradesco Foundation as well as Amazonas State University Amazonas Federal University and Sao Paulo University Intel aims to extend wireless PC access to millions of citizens in Latin America and train more than a million teachers about the effective use of technology in the classroom In Parintins Intel has already trained 24 teachers through its education initiatives The Intel Teach Program teaches teachers how to use technology to improve the way students learn The Intel Learn Program provides job readiness skills to underprivileged stu dents between the ages of 10 and 18 F information com The student from the moment he gets in touch with other people other cultures with other information beyond the borders of his country he gets a lot of benefits said Goncala Do Nacimento Pinto Filha a fifth grade teacher in Parintins The community can keep up with evolution It can feel equal in social terms as well As part of Parintins digital makeover Amazon University is starting a telemedi cine program developed jointly with the medical school of Sao Paulo University The new capabilities including real time video interaction between specialists and patients hundreds
18. and full copyright remains with the original author or company designated in the copyright notice F information com Extreme I mplicit 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 validate a _ prior consultant s work indicating that the thread design of a new device would fail exactly at the design load of the instrument Since the company had experimental data which strongly indicated a failure load of 2x the design load there was a whirlwind of debate as to whether to proceed to mass production or conduct an extensive redesign campaign Although entered this project with high confidence soon realized what a quagmire had entered Initially thought the analysis work could be accomplished using a standard implicit nonlinear code and after a few days of frustrating keyboard pounding soon realized that needed more horsepower was against the wall and it was time to pull out the big guns LS DYNA Initially was a bit hesitant to use LS DYNA since wanted to maintain the analysis procedure within the implicit world and historically LS DYNA 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 can clearly state that LS DYNA has made great strides in the implicit realm That is
19. aper deadline April 1st e Aerospace 2007 e Automotive e Biomechanics e Civil Engineering For information on Paper Submissions e Impact and Drop Testing Exhibit Booth and or Available Sponsor e Material Modeling ships Contact e Metal Forming e Nuclear e Dr Marcus Redhe e Occupant Pedestrian Safety Engineering Research Nordic e Seismic Engineering and more Brigadgatan 16 SE 581 31 Linkoping A software and hardware exhibition will Sweden be organized during the conference In terested companies should contact Engi neering Research Nordic We are expecting delegates and presen tations from all over the world to discuss problems facing the industry today and in the future Dr John Hallquist will be a keynote speaker presenting new LS DYNA fea tures F information com Whatever your environment there s an SGI server that can keep your data m oving Whatever your environment there s an SGI server that can keep your data moving As workflows become more diverse it s critical that your server architecture is flexible enough to efficiently power a wide range of applications That s why we re expanding our innovative line of Linux OS based solutions to de liver rapid insights and maximize your investment even in the most diverse envi ronments Introducing our new SGI Altix XE line of servers and clusters Cluster your power and maximize value A fully integrated cluster solution based on the
20. artments which are already using ANSYS Workbench Moreover the CAD in terfaces in ANSYS Workbench also allow a closer link to the construction depart ments More information CADFEM GmbH Dr Ing Matthias Hoermann Phone 49 8092 7005 41 E Mail mhoermann cadfem de www cadfem de Interface Workbench LS DYNA on the CADFEM Users Meeting 2006 The interface will be presented during a two hour afternoon workshop on Wednesday October 25 at the 2006 CADFEM Users Meeting to take place in Stuttgart Germany from October OEE to 27 2006 Additionally the meeting will provide in depth information about new features and developments LS DYNA and LS PrePost featuring speakers including Dr John Hallquist www usersmeeting com F information com TOP CRUNCH News LS DYNA Benchmarks Online Dr David Benson www topcrunch org FEA Information Participant HP Posted 10 12 2006 HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP Opteron CP4000 InfiniBand HP HP
21. at the middle of 3 cables Now when try to run the analysis it is error terminating with negative volume problems in the elements of circular cables Reply by Len Schwer In my experience the most likely cause of negative volumes is due to concentrated point forces or contacts that result in point forces suggest you search the archives of this group as this topic comes up frequently e g see Message 9415 posted 12 Apr 06 Question Apply load in cylindrical co ordinate system would like to know how to create a cylindrical coordinate system in LS DYNA and apply some load in that system and get results in that coordinate system Reply by Jim Kennedy To the best of my knowledge LS DYNA does not have a cylindrical coordinate system op tion LS DYNA expects Cartesian coordinate systems The exception is the 2D axisymmetric F information com 12 analysis options If you are interested in using one of the axisymmetric options suggest that you look at Remark 3 on page 19 20 of the LS DYNA Version 970 User s Manual Follow up Question Thanks for your help If created a material co ordinate system is it possible to see re sults in material co ordinate system i e would like to know results of hoop stress and tangential stress values in my analysis Follow up Reply by Jim Kennedy believe that you will find that only the orthotropic and anisotropic materials can be output in their own local material coordinate system
22. e 30 F information com 31 Consulting and Engineering Services Alphabetical Order By Country direct links will be completed October Australia Leading Engineering Analysis Providers LEAP Manly NSW Greg Horner info leapaust com au 02 8966 7888 Canada Metal Forming Analysis Corp Kingston Ontario Chris Galbraith galo mfac com 613 547 5395 India Altair Engineering India Bangalore de Dias info in altair com 0 80 2658 8540 Italy EO Ital Torino sales altairtorino it Italy Numerica SRL Firenze info numerica srl it 39 055 432010 UK ARUP Solihull West Midlands vue Walker brian walker arup com 121 213 3317 USA Sd L C l 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 USA Structure Incorporated Neenah WI Todd L Peters www structuretechnology com eee gy info structuretechnology F Ginformation com 32 Educational amp Contributing Participants Alphabetical Order By Country Dr Quing Zhou Tsinghua University inia Dr Anindya Deb Indian Institute of Science Italy Professor Gennaro Monacelli Frode a PISIS 6 Univ Crane Frederico IlI Dr Alexey l Borovkov St Petersburg State Tech University Dr Ted Belytschko Northwestern University Dr Bhavin V Mehta Ohio University Dr Taylan Altan The Ohio State
23. e Yahoo Groups archives does anyone other than Jim Kennedy amp me look in the archives produced this cogent posting 1167 on 6 Dec 02 F information com 10 If you output the velocities and accelerations at EVERY time step AND use the Current Time Step Size then the central difference operator applied to the time centered veloci ties will give the acceleration as that is EXACTLY the inverse of how they are calculated in LS DYNA In LS DYNA the accelerations are integrated to give the time centered velocities using the central difference operator Now if you output at some regular time interval and use the average time step you will NOT get the acceleration from differencing the velocity because that is NOT how the accel erations are calculated This is the typical NODOUT file process The computed LS DYNA acceleration histories are usually very noisy so even small errors in user integration velocity differentiation will produces different results To compare computed and measured acceleration records Filtering and NOT smoothing should be used on the computed accelerations in a manner similar to how the measured accelerations were filtered all accelerometers are frequency limited and typical signal conditioners fur ther filter the measurements Question Converting solid elements to SPH nodes wonder if there is any kind of application or file to transform a solid element mesh into SPH nodes format When you want to use
24. ear analyses e g drop tests buckling and load limit analyses is rising strongly A complex contact defini tion coupled with high frequency time transient stress wave propagation in the component is of vital importance in vir tual drop testing Furthermore dealing with load limit analyses requires large element deformations and corresponding non linear material models taking into account damage to the material with sub sequent failure too Interface Workbench LS DYNA An interface between ANSYS Workbench and LS DYNA provides the opportunity to combine both programs The German ANSYS and LS DYNA distributor CADFEM GmbH has thus created a unidirectional interactive graphic interface for the trans fer of data from ANSYS Workbench to LS DYNA This not only enables users to transfer the pure structure in form of nodes and elements but sections materi als contact definitions and boundary con ditions including prescribed motions and force loading too LS DYNA specific con trol and database options will be included from a template file which can be cus tomized by the user F information com Advantages for LS DYNA users LS DYNA users will benefit from this inter face With an existing ANSYS Workbench license and LSTC s free of charge LS PrePost an additional preprocessor caus ing cost and training effort may no longer be necessary The interface also enables easier data exchange with other analysis dep
25. f 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 ESI Co Ltd Phone 86 020 8235 6272 Contact Yang Xiaojun F information com Informational Websites The LSTC LS DYNA Support site www dynasupport com LS DYNA Examples dy ples more than 100 Examples GERREN LS DYNA Conference Site www ls dynaconferences com LS DYNA Publications to Download On Line LS DYNA Publications www feapublications com LS DYNA CADFEM Portal www lsdyna portal com www dynalook com 35 F information com 36 SIN European LS DYNA Conference May 28 29 2007 www erab se conference2007 Engineering Research Nordic will be hosting the 6th European LS DYNA Users Conference held at Quality Hotel 11 in Gothenburg Sweden May 28 29 2007 The conference brings together LS DYNA users researchers and developers to dis cuss LS DYNA simulations of complex mechanical problems The conference also attracts a wide range of hardware Specifications for Paper Submissions and software companies wishing to e Paper length 3 000 words maxi showcase their special solutions when mum running LS DYNA simulations e Abstract deadline January 26th 2007 The conference will cover LS DYNA appli e Notification of acceptance Febru cations Among them will be ary 9th 2007 e Final p
26. gies 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 MSC 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
27. grangian thermal and mechanical coupled finite element model developed in LS DYNA was successful to simulate de formation of the aluminum alloy during sliding contacts Subsurface distributions of the hydrostatic pressure strain rate and temperature which are difficult to characterize experimentally or theoreti cally for work hardening materials were determined for different loading conditions during sliding contacts Predicted distribu tions of stresses and strains were used to model subsurface damage gradient and delamination of subsurface layers Nu merical investigation of a void growth model based on a ductile void growth the ory showed the presence of a damage gradient and a critical depth at which de lamination cracks might initiate and propagate F information com 19 Previous Month Sept Weekly News Page Highlights Review Complete Product Service information can be found on the respective com pany website Information is copyright to the respective listed companies NEC Corporation For Complete I nfor mation NEC vector supercomputers ESI Group For Complete Information Statistical Energy Analysis Software IBM For Complete Information The IBM System Blue Gene MSC Software For Complete I nforma tion SimXpert Radically Changing the Analysis Process SGI For Complete Information A Multi Workflow Architecture for High Performance Computing Qlogic For Complete Information QLogic I
28. h Intel plans to invest more than US 1 billion globally over the next 5 years to accelerate access to computers the Internet and technology for people in de veloping communities The digital transformation of Parintins a town on an island in the Amazon River is expected to improve the healthcare and education of its 114 000 residents and advance the lives of future generations Technology has expanded what is possi ble in Parintins said Intel Chairman Craig Barrett at a dedication ceremony today in the Amazon rain forest It is now a place where wireless broadband links to the Internet bring the expertise of specialists sophisticated medical imaging and the world s libraries to a community reachable only by airplane or boat Working with the Brazilian government and business and education officials Intel and its collaborators installed a state of the art WiMAX network for a primary healthcare center two public schools a community center and Amazon University Intel also donated and installed telemedi cine equipment at the health center and computer labs at the two schools where students and teachers can regularly con nect to the outside world for the first time We ve been blessed with this project said Parintins Mayor Frank Bi Garcia We re really isolated and don t have the conditions to receive the Internet with ca bles So we re receiving it wireless from antennas from satellites
29. kspace 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 26 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 information 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 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 pr
30. nfiniPath InfiniBand HCAs smoke the competition with the in dustry s highest message rate F information com LSTC Training Classes Oct Dec 2006 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 www Istc com Training Class Livermore CA Advanced LS DYNA for Impact 950 Analysis Advanced Options in LS DYNA 750 ALE Eulerian amp Fluid Structure Interaction in LS DYNA 750 Concrete and Geomaterial Model ing with LS DYNA ZO Oct 24 25 Contact in LS DYNA 750 Introduction to LS DYNA 750 Oct 23 26 Nov 14 17 Dec 11 14 Introduction to LS OPT 750 Nov 07 10 LS DYNA Composite Materials 750 LS DYNA Implicit 750 LS DYNA for Heat Transfer amp Thermal Stress Problems 500 Material Modeling Using LS DYNA User Defined Options ZEA MESH Free Methods in LS DYNA SPH and EFG 750 20 F information com 21 EVENTS 2006 If you want your event listed please send the information to mv feainformation com 2006 CADFEM Users Meeting Oct 25 27 International Congress on FEM Technology Stuttgart area Germany ANSYS CHINA User Conference amp 10th Anniversary Sanya neues China Aerospace Design Expo 06 acm Ch Ue CA US 2007 6th European May 28 29 6th European Sweden 2008 June 8 10 8th International Use
31. non linear analysis capabilities within the Workbench environment Numerical Simulations as integral part in the virtual product development process exhibit a huge spectrum Ranging from simple modal analyses over linear and nonlinear stiffness and strength based problems up to coupled multiphysic analy ses where different physical disciplines interact with each other Since they complement each other so well ANSYS Workbench and LS DYNA de liver unrivaled excellence in covering a huge number of current FEM simulation tasks ANSYS Workbench ANSYS Workbench is a simulation platform that enables users to perform more product development tasks faster With the Workbench environment ANSYS took a quantum leap into model analysis and handling different simulation disci plines Besides structural and fluid me chanics tasks it can also process coupled phenomena Multiphysics such as elec tromagnetic thermal mechanical effects and fluid structure interaction in the same standard user interface Besides its multi tasking features ANSYS Workbench also boasts seamless model file transfer from and to almost all com mon 3D CAD systems It also handles as semblies with automatic mesh generation and automatic contact detection effi ciently LS DYNA LS DYNA is extremely strong in areas where large non linear issues and short time dynamics are relevant In product development the demand for transient strongly non lin
32. ocessing e Model Assembler for organizing the model through sub assembly sub models and included files 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 NASTRAN files pe pere ber pe e pes been purga e parr pe ele Irel ralera Sian F information com Hardware Computing Communication Products Logo s hyperlink to company s website AMD lt 1 KO invent sgi Microsoft e FUJITSU QLOGIC F information com Software Distributors Alphabetical order by Country Leading Engineering Analysis Providers Canada pn Metal Forming Analysis Corporation ANSYS China China China China Germany Germany India Italy Italy Japan Japan Japan Korea Korea Arup MSC Software China CAD FEM DynaMore Altair Engineering India Altair Engineering Italy Fujitsu Limited The J apan Research Institute CRC Solutions Corp Korean Simulation Technologies Theme Engineering 29 F information com Software Distributors cont Alphabetical order by Country per Infinite Simulations Sysbems B V e Netherlands Engineering Technology Associates Inc Livermore Software Technology Corp her
33. ostings to the LS DYNA Yahoo Group Nodal Acceleration Result Converting solid elements to SPH nodes Negative volume problem Apply load in cylindrical co ordinate system Concrete Erosion gida E Question Nodal Acceleration Result I am performing a drop simulation and measurement found that the nodal acceleration is much larger than measurement result But dv dt is close to the measurement data have 2 questions 1 Is the acceleration result from LS DYNA reliable If need to read the nodal accelera tion result which value should get acceleration or dv dt 2 What the difference between acceleration and dv dt know it has different physical meaning but can t explain it exactly Reply by Denis Corkery The usual recommendation is that you use the dv dt rather then reading accelerations di rectly think the reason for this is that the nodal accelerations are calculated based on the central difference method which averages the nodal accelerations between output inter vals This will result in an artificially smoothed acceleration trace due to the averaging that has taken place The dv dt should be more representative as it converts the nodal veloci ties directly at each output interval It is also recommended that the frequency rate of the simulation data matches that of the sampling rate of the test instrumentation typically 10kHz for a fair comparison to be made Reply by Len Schwer A quick search of th
34. p your 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 F information com FEA Information Announcements Our 6 Anniversary Celebrating our Anniversary October marks our 6 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 amp 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
35. rocessor 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 16 Oct Tutorial 11 added to online docu mentation 12 Oct Tutorial 10 added to online docu mentation 11 Oct Update of nLMesh Interface 10 Oct Added QuickBeam option to EIEdit Interface to allow convenient crea tion of 2 noded beams 09 Oct Added Direction option to EIEdit In terface to modify element orienta tion 04 Oct Major update to the form and func tionality of the LS PrePost Google Group 21 Sep Tutorial 9 added to online docu mentation 20 Sep Enabled pre filtering for HIC CSI calculations using the ASCII Inter face 19 Sep Enabled Function Keys for panel navigation and command file exe cution 11 Sep Added search function powered by Google F Anformation com 9 Yahoo Group Yammerings Note LS DYNA Yahoo Group is neither owned nor operated by LSTC and LSTC does not control the content Jim Kennedy Len Schwer KBS2 Inc Schwer Engineering amp Consulting Ser jmk kbs2 com vices 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 p
36. rs Conference Dearborn MI US F GAnformation 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 HP Opteron HP Alpha IBM Power 4 5 IBM Power 5 INTEL IAGO INTEL IA64 INTEL Xeon EMT64 NEC SX6 SGI Mips SGI LAGA SUSE 9 with ProPack 4 Red Hat 3 with ProPack 3 22 F information com LS DYNA Resource Page MPP Interconnect and MPI 23 FEA Information Inc Participant s alphabetical order Fully QA d by Livermore Software Technology Corporation TABLE 1 SMP Fully QA d by LSTC AMD Opteron FUJITSU Prime Power FUJITSU VPP HP PA 8x00 HP IA 64 HP Opteron HP Alpha IBM Power 4 5 IBM Power 5 INTEL IA32 INTEL IA64 INTEL Xeon EMT64 NEC SX6 SGI Mips SGI IADA Linux SUN OS 5 8 Unix_System_V HP UX 11 11 and above HP UX 11 22 and above Linux CP4000 XC True 64 AIX 5 1 5 2 5 3 SUSE 9 0 Linux Windows Linux Linux Super UX IRIX 6 5 X SUSE 9 with ProPack 4 Red Hat 3 with ProPack 3 F information com 24 TABLE 2 MPP Interconnect and MPI Vendor O S HPC Intereconnect MPI Software InfiniBand SilverStorm AMD Opteron Linux MyriCom vite Tk HP
37. t for the SPH part Or just click New ID button and it will give you the next available part number You have to assign a material to it Although you are using an exiting part LSPP wants you to define the material for the SPH part So click on the button gt gt next to the Mat ID la bel and you will be presented with a material link dialog of the material types available in the model Choose one material type there is no material ID in here and click Edit and once you get the material keyword input dialog choose the material ID you want and click Accept and then Done and then another Done on the Material Link You should by now have the Apply button active Press the Apply and your original part will disap pear But if you go to Page 1 and SelPar you should get a new part in there select it and your particles should be on the screen It did not work for me the first time although created the model in LSPP But after saving it quitting LSPP starting LSPP again reading the model back into LSPP it worked Question Negative volume problem I am running an analysis of circular cables These cables are welded on top and bottom to two beams have meshed the cables with solid 8 noded elements and the material for the cables is Mat_Piecewise Linear Plasticity steel with density of 5 87e 09 and young s modulus of 205000 The units used are mm and N have given the load for the nodes
38. to say LS DYNA has always been dominant on the explicit side while its implicit capabilities were considered more of a sub set Initially the LS DYNA results for the thread design matched up with the original consultant s work This was depressing since the experimental work indicated a 2x load factor and knew that LS DYNA could do better Digging in and making several calls to the technical support staff at LSTC a recommendation was made to use MAT PLASTICITY COMPRESSION TENSION MAT 124 along with several other tweaks to the implicit solver routine The utility of this material model is that one can use different stress strain curves and failure limits for compression and tension This was absolutely fantastic for the plastic material used for the thread design since the failure stress for the plastic under compression is about 3x higher than that for tension With these changes in place the LS DYNA model predicted a failure load of 2x the design load This was very gratifying since the material stress strain curves were not adjusted and were used straight out of the gate perre pera 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 F Anformation com Modeling Notes The 3 D geometry was provided in the form of a Pro E STEP file and imported directly into

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