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4th European LS-DYNA Conference

Structural Design Review of LCD-TV Module by Impact Analysis
Seong-Sik Choi, Jeoung-Gwen Lee - Samsung Electronics, Korea
Display performance of LCD is going to be continuously high definition, high brightness, wide viewing angle. On the other hand, outline dimensions are demanded to be slimer and lighter. As the result of above demand, the space of each part becomes gradually narrow and tight. Therefore, the importance of design to prevent weakness for impact is embossed greatly. LCD products have to be subjected to various impact test for consumer's using ...
Numerical modelling of impacts on ski safety nets
Melissa Adoum - CRIL Technology Correspondence
Safety nets are used to protect skiers during downhill competitions. However, although these nets are now able to retain skiers in almost all cases, the deceleration during such impacts can cause severe harm to skiers including hyperflexion injury or vertebra compaction. Experience showed that the behaviour of the nets is highly dependant on: • the material of which they are made of • the boundary conditions (installation and fastening). The aim ...
Optimization of a Cockpit Structure according to ECE-R21 Regulation
Michael Walter, Hartmut Chladek, Dr. Armin Huß - Ingenieurbüro Huß und Feickert, Germany
For a prototype of the new LANDROVER cockpit, developed by Siemens VDO Automotive, the design of the co-driver airbag area had to be optimized with the help of simulation in order to fulfill the guidelines of ECE-R 21. Furthermore a more limited inhouse-target had to be reached. The actual state of the prototype was illustrated by simulation and the influence of different measures on the crash behavior was examined. Among other things the ...
Numerical Simulation of a Flight Recorder’s Protective Case Penetration Resistance Test
Alexander A. Ryabov, Vladimir I. Romanov, Sergey S. Kukanov, Dmitry V. Roschihmarov Sarov - Open Computing Center, Russia
Development of a durable flight recorder’s protective case is a very difficult engineering problem. To save information, the case must be strong enough to withstand intensive accidental thermal and mechanical loading in aircraft crash. So the case must meets strong requirements. One of the toughest of these demands is that any flight recorder’s case must be strong enough to withstand a penetration resistance test - an impact of pin at any angle ...
Examples' manual for *USER_LOADING option
Melissa Adoum, Vincent Lapoujade - CRIL Technology Correspondence
The aim of this study is to understand how the *USER_LOADING option works and to give some examples of its use. This option uses the subroutine loadud, its usage will be described step by step and it is illustrated with four examples : • Plate loaded with time dependant pressure, • Plate loaded with displacement dependant pressure, • Randers-Pehrson & Bannister Tests, • Plate loaded by an explosion of 5kg of TNT. Some of those examples use ...
Improved Numerical Investigations of a Projectile Impact on a Textile Structure
Gunther Blankenhorn - Universität Karlsruhe
Karl Schweizerhof - Dynamore GmbH
Hermann Finckh - Institut für Textil- und Verfahrenstechnik Denkendorf
Past perceptions to the processes of the penetration mechanisms of projectiles acting on textile structures [1] are often based on continuum models [2] or simplified models [3] and admit only limited conclusions concerning the real behavior of protective clothing made from several layers of fabric. Only a few investigations are known up to now with models based on single yarns as a major component for discretization [4]. Thus, for the prediction ...
Simulation of full-scale seismic-resistant structural frame tests using LS-DYNA 960 Implicit Solver
CAROLINE J.FIELD - Ove Arup & Partners
This paper focuses on the finite element simulation of two full-scale tests of high performance, seismic-resistant structural frames using the LS-DYNA 960 implicit solver. The frame was physically tested as part of the design validation for the new Stanley Hall building on the University of California Berkeley Campus. The pseudo static non-linear analyses, showed excellent correlation with the measured test data. Two sequential tests were ...
Stabilized DSG Elements – A New Paradigm in Finite Element Technology
Manfred Bischoff, Frank Koschnick, Kai-Uwe Bletzinger - Technische Universität München
The Discrete Shear Gap Method, initially proposed for the elimination of transverse shear locking in plate and shell finite elements is extended to a more general concept, applicable to other locking problems, typically causing severe trouble in structural analysis, especially in the case of thin-walled structures. The outstanding feature of the proposed formulation is the fact that one unique method is used to avoid various different kinds of ...
Under the Hood of Implicit LS-DYNA
Cleve Ashcraft, Roger Grimes, Brad Maker - LSTC
 
Heat Transfer in LS-DYNA
Arthur B. Shapiro - Livermore Software Technology Corporation
LS-Dyna can solve steady state and transient heat transfer problems on 2dimensional parts, cylindrical symmetric parts (axisymmetric), and 3-dimensional parts. Heat transfer can be coupled with other features in LS-DYNA to provide modeling capabilities for thermal-stress and thermal-fluid coupling. This paper presents several examples using LS-DYNA for modeling manufacturing processes (e.g., upseting, extrusion, welding, casting).
LS-DYNA Beam Elements: Default and User Defined Cross Section Integration
Len Schwer - Schwer Engineering and Consulting Services, USA
LS-DYNA provides several beam element formulations, see the keyword description for *Section_Beam in the User’s Manual. Several of these beam element formulations support user supplied integration of the cross section, via the *Integration_Beam keyword. While most LS-DYNA users are familiar with the similar through-the-thickness integration algorithm for shell elements, which is made trivial by the rectangular cross section geometry assumed for ...
Fluid-Structure Interaction in LS-DYNA: Industrial Applications
M’hamed Souli - Universite des Sciences et Technologie de Lille
Lars Olovson - LSTC
Numerical problems due to element distortions limit the applicability of a Lagrangian description of motion when modeling large deformation processes. An alternative technique is the multi-material Eulerian formulation. It is a method where the material flows through a mesh that is completely fixed in space and where each element is allowed to contain a mixture of different materials. The method completely avoids element distortions and it can, ...
Jet Engine Fan Blade Containment using Two Alternate Geometries
Kelly Carney, Mike Pereira, Duane Revilock - NASA Glenn Research Center
Paul Matheny - Florida Turbine Technology
In the rare event of a fan blade separation, the fan blade must not penetrate the case of a commercial jet engine. Due to this requirement the fan case is the heaviest single component of a jet engine. With a goal of reducing that weight, a simulation of a fan blade containment system was tested at the NASA GRC Ballistic Impact Lab and analyzed using LS-DYNA. A fan blade simulating projectile was shot at two alternate geometric containment case ...
The use of LS-DYNA fluid-structure interaction to simulate fluid-driven deformation in the aortic valve
Chris Carmody - MG Bennett & Associates Ltd
Gaetano Burriesci - Sorin Biomedica Cardio
Ian Howard, E.A. Patterson - Sheffield University
 
Crashworthiness Optimization in LS-OPT: Case Studies in Metamodeling and Random Search Techniques
Nielen Stander, Willem Roux - Livermore Software Technology Corporation
Mathias Giger, Marcus Redhe - University of Linköping, Sweden
Nely Fedorova - Snezhinsk Institute of Physics and Technology, Russia
Johan Haarhoff - University of Pretoria, South Africa
This crashworthiness optimization study compares the use of three metamodeling techniques while using a sequential random search method as a control procedure. The three methods applied are (i) the original Successive Linear Response Surface Method, (ii) the Neural Network method and (iii) the Kriging method. It is shown that, although NN and Kriging seem to require a larger number of initial points, the three metamodeling methods have ...
Analyzing 'Noisy' Structural Problems with LS-OPT: Probabilistic and Deterministic Fundamentals
Willem Roux, Nielen Stander - Livermore Software Technology Corporation
System identification of 'noisy' structural design optimization problems: the sources of uncertainty, the competing roles of bias and variance, and the interaction of uncertainty and deterministic effects. Two test problems are used to clarify the effect of different approaches.
Shape Adaptive Airfoils for Turbomachinery applications: Simulation and Optimization
Tobias Müller, Martin Lawerenz - University of Kassel
Smart materials and smart structural concepts in flow control have the potential for significant impact on the design and performance of modern turbocompressors. While the benefits of an airfoil whose geometry is variable were investigated in detail in the area of adaptive wings for airplanes, this is a new field for the application in turbomachines. The main focus is on simulations of novel flow control concepts to allow a structural ’morphing’ and ...
Recent Developments of LS-DYNA Performance Optimization
Youn-Seo Roh, Henry Fong - Sun Microsystems, Inc.
A recent effort of optimizing the performance of LS-DYNA running on SPARC(R)-SolarisTM servers is described. With new releases of compilers, generated executables benefit from the additional performance of latest UltraSPARC(R) CPU's for SMP servers. Also, new release of Sun HPC ClusterToolsTM cluster environment includes tools that facilitates tuning of LS-DYNA-MPP executables and the MPI environment. A collection of development tools targeted ...
Benefits of the AMD Opteron Processor for LS-DYNA
Dawn Rintala - Advanced Micro Devices, Inc.
 
Itanium®– a viable next-generation technology for crash simulation?
Adrian Hillcoat - Hewlett-Packard Ltd Bracknell, UK
In the area of crash simulation, LS-DYNA has traditionally been a good application for measuring performance of leading computer architectures. This paper considers the architectural design of the Intel Itanium® processor, as well as the system architectures into which Itanium fits, with the purpose of understanding the benefits of the novel 64-bit EPIC architecture over and above conventional 64-bit RISC architectures as well as 32-bit Intel ...
Performance of LS-DYNA on NEC-Clusters and new highend SMP-Systems
Dr. A. Findling - NEC Europe GmbH
Performance of LS-DYNA on hpcLine Linux Clusters
K. Altmeyer - Fujitsu Siemens Computers GmbH
How to Make LS-DYNA Run Faster
Guangye Li, Jeff Zais - IBM Deep Computing Team
 
The New Paradigm Shift for High-Performance Computing
Dr. Herbert Cornelius - Intel EMEA
 
Considerations for LS-DYNA Efficiency in SGI IRIX and Linux Environments with a NUMA System Architecture
Stan Posey, Nick Meng - SGI
Manufacturing industry and research organizations continue to increase their investments in structural analysis and impact simulations such that the growing number of LS-DYNA users continue to demand more from computer system environments. These demands typically include rapid single job turnaround and multi-job throughput capability in a multi-user high-performance computing (HPC) environment. What is more, many LS-DYNA simulation environments ...
Linux Cluster Compute Power Out of the Box
Harry Schlagenhauf - science+computing
 
The Relation between Initial Yaw and Long Rod Projectile Shape after Penetrating an Oblique Thin plate
M. Arad, D. Touati , I. Latovitz
The effect of yaw on the ability of an eroding long rod projectile to penetrate oblique thin targets was investigated. Numerical simulations of an eroding long tungsten rod projectile penetrating an oblique thin steel plate target were conducted using the LSDYNA code with a user-written subroutine. The numerical results were found to agree with the experimental data. From the simulation results it may be concluded that following penetration of a ...
A Correlation Study between MPP LS-DYNA Performance and Various Interconnection Networks — a Quantitative Approach for Determining the Communication and Computation Costs
Yih-Yih Lin - Hewlett-Packard Company
As MPP LS-DYNA uses the message-passing paradigm to obtain parallelism, the elapsed time of an MPP LS-DYNA simulation comprises of two parts: computation cost and communication cost. A quantitative approach for determining the communication cost and, hence, the computation cost and the speedup of an MPP LS-DYNA simulation is presented. Elapsed times, characteristic—latency and bandwidth—of interconnect networks, and message patterns are first ...
Numerical and Experimental Study on Fracture of Chute Structure at Deployment of Invisible Passenger Side Airbag
L. Kangwook - Hyundai Mobiles
CAE Simulations for Passive Safety focused on the Porsche Cayenne - the Transition to New Technologies
Erich Schelkle, Herbert Klamser - Dr. Ing. h.c. F. Porsche AG
Simulation technologies are methods which have been traditionally applied in automotive engineering for a long time. Over the decades, enormous progress has been achieved in both, the simulation methods and the CAE-programs used. Thanks to the high efficiency levels of the current computer generation and the use of economically priced commercially available hardware such methods are being applied on a widespread basis today. Visionary concepts ...
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