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4th European LS-DYNA Conference

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 ...
LS-DYNA on Linux-Clusters at EDAG Use Case
John U.S. Hanlon - EDAG Engineering & Design AG
Bernward Platz - Teraport GmbH
At EDAG, the increasing demand for crash simulations with LS-DYNA required the expansion of the existing compute resources in the beginning of 2002. As at this point there was a stable and performant MPP-version of LS-DYNA available, EDAG decided - despite of the new technology - to purchase a Linux-cluster consisting of 8 nodes and 16 processors. Meanwhile EDAG has deployed over 14 clusters at three different locations. Whereas at the ...
Manufacturing Simulation of an Automotive Hood Assembly
Chris Galbraith, Dylan Thomas - Centre for Automotive Materials and Manufacturing currently with Honda R&D Americas, Inc.
Mark Finn - Alcan International Ltd.
This paper presents the results of applying the finite element method to calculating the spring back of an automotive hood assembly, and its application to the functional build method. The assembly was comprised of six individual panels: an inner panel, an outer panel, a major reinforcement, a latch reinforcement, and two hinge reinforcements. Finite element simulations were conducted for forming each of the six components. Each component was ...
Modelling of Foams using MAT83 - Preparation and Evaluation of Experimental Data
Enver Serifi - Universität Stuttgart
Andreas Hirth, Stefan Matthaei - DaimlerChrysler AG
Heiner Müllerschön - DYNAmore GmbH
Foam materials are widely used in automotive industry such as energy absorbers and comfort enhancers. Because of high energy absorbing capability of foams, they became very important in vehicle crashworthiness. So in this manner, FE modelling of foam materials also becomes important. Although foam materials are very promising materials, not that much study has been done about foams comparing to other commonly used materials like steel, etc. ...
Modelling of Foams using MAT83 – Preparation and Evaluation of Experimental Data
Enver Serifi - Universität Stuttgart
Andreas Hirth, Stefan Matthaei - DaimlerChrysler AG
Heiner Müllerschön - DYNAmore GmbH
Foam materials are widely used in automotive industry such as energy absorbers and comfort enhancers. Because of high energy absorbing capability of foams, they became very important in vehicle crashworthiness. So in this manner, FE modelling of foam materials also becomes important. Although foam materials are very promising materials, not that much study has been done about foams comparing to other commonly used materials like steel, etc. Some ...
Modern Field Code Cluster of Fluid Dynamics and Structure Mechanics with MetaComputing Grids for Safety and Environment Research Studies
W. Rehm, B.Wang - Forschungszentrum Jülich
B. Binninger - University Aachen
C. Nae - University Bucharest
In this this paper, we describe main results obtained within the scope of joint project activities concerning the numerical simulation of reacting flows in complex geometries. The aim is the refinement of numerical methods for applied computational fluid dynamics (CFD) using high-performance computations (HPC) to study explosion processes in more detail, especially for hydrogen safety and environment aspects of innovative technical systems. The ...
More Realistic Virtual Prototypes by means of Process Chain Optimisation
Peter Gantner, Herbert Bauer - Aalen University
David K. Harrison, Anjali K. M. De Silva - Glasgow Caledonian University
This paper is concerned with closing a gap in the process chain of metal forming. Tools for simulating the metal forming process like LS-DYNA® produce output geometries and stress information which cannot be easily re-imported in CADSystems or structure analysis programs for further processing. A concept has been developed and implemented with a corresponding program which allows the re-importation of parts with certain topologies (tube, plane) ...
Newly Developed Capabilities of DYNAFORM Version 5.0
Wenliang Chen, Dingyu Chen, H.Xie, Quanqing Yan, Arthur Tang, Chin Chun Chen - Engineering Technology Associates, Inc., USA
Over the past two decades, the finite element analysis (FEA) has emerged as one of the most important engineering tools in the many industries, due to its flexibility and accuracy in prediction. Nowadays, it is widely used in sheet metal forming industry to predict the forming feasibility of wide variety of complex components, ranging from aerospace and automotive components to household products. As the demand of FEA accelerates, the need for a ...
Numerical and Experimental Study on Fracture of Chute Structure at Deployment of Invisible Passenger Side Airbag
L. Kangwook - Hyundai Mobiles
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 ...
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 ...
On Airbag Simulation in LS –DYNA with the use of the Arbitrary Lagrangian - Eulerian Method
Dmitri Fokin, Nitin Lokhande, Lars Fredriksson - Altair Engineering GmbH, Germany
In the present paper a basic finite element model of an ALE thorax side airbag with a simplified gas generator will be considered. In particular, it will be discussed how to define boundary conditions and properties of the inflating gas. A possible general approach to ALE airbag validation to fit results of a standard body block test will be described. Finally numerical results for a push-away test for an ALE and corresponding CV airbag will be ...
On Constitutive Equations For Elastomers And Elastomeric Foams
William W. Feng, John O. Hallquist - Livermore Software Technology Corporation
The Hill-Ogden elastic constitutive equation for incompressible and compressible rubber-like materials is presented. The derivation and computer programs to determine the material constants for these equations from uniaxial and biaxial tests are included. These constitutive equations and the computer programs for determining the material constants have been implemented into LS-DYNA. A few examples are shown. Some special cases are given to ...
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 ...
Performance of LS-DYNA on hpcLine Linux Clusters
K. Altmeyer - Fujitsu Siemens Computers GmbH
Performance of LS-DYNA on NEC-Clusters and new highend SMP-Systems
Dr. A. Findling - NEC Europe GmbH
Prediction of Occupant Injury in an Out-of-Position Impact Using the Fluid Structure Interaction Capabilities in LS-DYNA
Dr. P.O. Marklund - Engineering Research Nordic AB
Dr. B. Pipkorn, C.F. Lindh - Autoliv Research AB
Process optimised FEA- Calculation for Hydroforming Components
Michael Keigler, Herbert Bauer - University of Applied Sciences, Aalen, Germany
Richard Hall - University of Wolverhampton, UK
Prof. Musa Mihsein - De Montfort University, UK
Reasons for Scatter in Crash Simulation Results
Clemens-August Thole, Liquan Mei - Fraunhofer Institute for Algorithms and Scientific Computing
In crash simulation, small changes of the model or boundary conditions may result in substantial changes of the simulation results. For a BMW car model, the node positions of the crashed model show differences of up to 14 cm between several executions on a parallel machine for the same input deck. For the Dodge Neon testcase, small variations of the barrier position result in substantial scatter of the intrusion. Detailed investigations of ...
Recent advances in THUMS : development of individual internal organs, brain, small female, and pedestrian model
Masami Iwamoto, Kiyoshi Omori, Hideyuki Kimpara, Yuko Nakahira, Atsutaka Tamura, Isao Watanabe, Kazuo Miki - Toyota Central R&D Labs., Inc.,
Junji Hasegawa - Toyota Motor Corporation
Fuminori Oshita - The Japan Research Institute, Ltd.
A finite element model of total human model for safety, which is called THUMS, has been developed in order to study human body responses for impact loads. In previous report, a mid-size adult male occupant model of THUMS was developed and validated for several impact loads. This paper briefly describes recent advances in THUMS. Individual internal organ models and a detailed brain model have been developed to be integrated with the occupant ...
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 ...
Recent New Developments in Contact Mechanics
P. Wriggers, K. Fischer - University of Hanover
A. Rieger - Continental AG
During the last years considerable effort was devoted to better numerical treatment of contact problems. This fact is due to the growing computing power which lead to more and more sophistication and detailed technical models within engineering analysis. Due to the more precise modelling within the associated discretization process often unilateral constraints have to be considered. Hence better discretization techniques, especially for finite ...
Safety Analysis of the New Actros Megaspace Cabin According to ECE-R29/02
Horst Raich - DaimlerChrysler AG
During the development of truck cabins the safety of the driver and the front seat passenger in an accident is considered. The cab must be designed in such a way that in an accident a sufficient survival space is guaranteed. The legal requirements of cabin safety are fixed in Europe in the regulation ECE-R29. In order to reduce the number of iteration loops during the development process, a computational simulation method for the load cases roof ...
scFEMod – The New Preprocessor for Efficient Assembly and Model Validation
Ove Sommer, Thomas Ertl - science+computing
Norbert Frisch, Dirc Rose - University of Stuttgart
This paper presents a new preprocessor for the assembly of independently meshed car body parts. The assembly process gains more and more importance in the preprocessing of crash-worthiness simulations. It is desirable to take simulation results into consideration for construction decisions already in the early phase of the car development process. At this stage, CAD data unfortunately does not contain any information about constraints like ...
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 ...
Sheet Metal Forming in a Virtual Reality Environment using LS-DYNA and Neural Networks
Ashwini S. Gokhale - Wichita State University
Manufacturing process simulation using finite element techniques has immensely contributed to ensuring the success of concurrent design methodologies. However, Finite Element Methods (FEM) is computationally expensive and consequently unsuitable for design and manufacturing optimization in a production environment. In this research, a coupled Artificial Intelligence (AI) and FEM technique was developed to simulate and predict process response to ...
Sheet Metal Forming: Spring-back of hydro mechanical deep drawn parts
Jens Buchert, Herbert Bauer - University of Applied Sciences, Germany
David K. Harrison, Anjali De Silva - Glasgow Caledonian University, UK
Active hydro mechanical forming (AHMF) has been developed in order to meet the demand of the automotive industry for economical production of sheet metal parts with more individuality in small lot sizes. Conventional deep drawing of automobile parts which have large outer surface areas (such as roofs, doors and hoods) leaves them with a very small dent resistance. This is caused by the low deformation degree in the middle of the part. This low ...
Simulation of a Vehicle Running on to a Curb by Using Tire and Vehicle FE Models
Tatsuya Fukushima,
Hitoshi Shimonishi - NISSAN MOTOR CO.,LTD
Kimihiro Hayashi - The Japan Research Institute, Limited
A simplified FE tire model has capability to solve a large deformation of a tire on a vehicle running simulation with acceptable computational time. We tried to simulate a vehicle running on to a curb, one of vehicle strength tests, by using simplified FE tire models and a vehicle FE model which has detailed suspension models. It is necessary to solve the force to a wheel with good agreement with a car test, in order to estimate the force to ...
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 ...
Simulation of proposed FMVSS 202 using LS-DYNA Implicit
Vikas Patwardhan, Babushankar Sambamoorthy, Tuhin Halder - Lear Corporation
Federal Motor Vehicle Safety Standard 202 applies to automotive seat head restraints, and their attachment assemblies. The regulation is aimed at reducing the frequency and severity of neck injuries due to huge forces resulting from vehicle crashes. The main objective of this paper is to discuss the LS-DYNA IMPLICIT code vis-à-vis the simulation of the proposed FMVSS 202 regulation. The proposed changes to the FMVSS 202 standard incorporates a ...
Simulation of the forming process of the Metal-Plastic-Metal sheets
Dr. R. Borg - Engineering Research Nordic AB
Metal-Plastic-Metal (MPM) sheets consists of two metal sheets bonded together by a thin polymer layer. Modelling this sheet structure with a single shell element gives a too stiff response. The large shear deformation in the polymer layer can not be represented correctly. A method is presented on how to simmulate the forming process of MPM-sheets by which the two metal sheets are modelled with two layers of shell elements. The bonding polymer is ...
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 ...
Strength Analysis of Seat Belt Anchorage According to ECE R14 and FMVSS
Klaus Hessenberger - DaimlerChrysler AG
To guarantee proper function of the seat belt system, belt anchorages have to resist defined static test loads that represent an vehicular impact. ECE R14 and FMVSS210 are tests to ensure sufficient strength of all anchorage points. In these tests high forces are applied to the seatbelts over loading devices. All components of the sytems, namely seats, seat and belt anchorages have to resist the defined loads without damage. The loads are ...
Stress Analysis of Connector Pin Produced by Reverse Stamping Process with LS-DYNA Numerical Simulation and Comparison to Experiments
Won Yong-Hee, Kim Jeong-Ho, Lee Young-Jun - LG Cable Ltd
The conventional progressive stamping process used in producing connector pin makes the pin-shift from side to side due to elastic recovery reffered to springback phenomenon. As the solution of this problem, the reverse stamping process was introduced to the production process of connector pin in LG Cable. In this study, we performed research on the feasibility of reverse stamping process to support a design guide of which process. For this ...
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 ...
The application of the damage & fracture material model to crashworthiness evaluations for Aluminum cars
Tsuchida T., Yamamoto S. -Toyota Motor Corp.
Isomura K. - Toyota Industries Corp.
In an evaluation of crashworthiness for the cars that are made of aluminum alloys, the evaluations that consider a fracture phenomenon come to be needed because conventional aluminum alloys have low fracture strain (10 - 20%). Since an original damage & fracture material model of LS-DYNA, namely MAT_PLASTICITY_WITH _DAMAGE: MAT81 has a damage & fracture characteristic in case of compressive strain state, real collision phenomena can not be ...
The Development of the new XJ Jaguar in Advanced Aluminium; Opportunities and Challenges
Zeguer, T. - Jaguar Cars
The Evaluation of Crashworthiness of Vehicles with Forming Effect
Hyunsup Kim, Sungoh Hong, Seokgil Hong - KIA Motors
Hoon Huh - Korean Institute of Science and Technology, Korea
This paper is concerned with a crash analysis for vehicle structures considering forming effects. The properties of formed vehicle structures have been effected and changed by such as work hardening, non-uniform thickness distribution resulted from the forming process. The crash analysis of vehicle structures with the forming effects leads to different results from those without such effects. In this study, the forming effects of the front side ...
The New Paradigm Shift for High-Performance Computing
Dr. Herbert Cornelius - Intel EMEA
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 ...
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
Under the Hood of Implicit LS-DYNA
Cleve Ashcraft, Roger Grimes, Brad Maker - LSTC
Validation Simulation of New Railway Rolling Stock Using the Finite Element Method
Martin Wilson, Ben Ricketts
Bombardier Transportation is the largest manufacturer of rail vehicles in the world. The current product portfolio includes a wide variety of vehicles from low speed ‘people movers’ through to high speed inter-city trains. Bombardier offers products in every sector of the passenger rail equipment market and therefore is required to meet a number of national and international crash safety requirements. These requirements range from simple static ...
Virtual Die Tryout of Miniature Stamping Parts
Ming-Chang Yang, Tien-Chi Tsai - Metal Industries R&D Center, Taiwan
The authors would like to present the whole procedure of using dynamic explicit finite element method to aid multi-stage miniature stamping die design. How to cost down and time saving are the key issues for tool maker in Taiwan. It has been applied to many automobile components and metalwork successfully by computer aided design and engineering analysis. In this paper, we dedicated our application of these technologies to small scale stamping ...
Virtual Reality in Crash Simulation
Friedhelm Birk - 3Dims GmbH Frankfurt, Germany
Since simulation of complex things like crashing a car becomes more precise and more affordable its only natural that one wants to analyze the results in a way a humans nature can intake complexe data best: visually.
“Forming to Crash” Simulation in Full Vehicle Models
Janka Cafolla, Roger W. Hall, David P. Norman, Iain J. McGregor - Corus Automotive
Improving the accuracy of virtual prototypes helps to shorten product development times and reduces the number of physical prototypes required. One way in which the accuracy of crash analysis can be improved is to include the effects of forming in the material properties. Corus has developed a three-step “Forming to Crash” process to account for formed properties in crash analysis during both concept and detailed vehicle design stages. The first ...