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5th European LS-DYNA Conference

A Computational and Experimental Analysis of Ballistic Impact to Sheet Metal Aircraft Structures
Matti J. Loikkanen - Boeing Commercial Airplanes
Murat Buyuk, Cing-Dao (Steve) Kan - The George Washington University
Nick Meng - SGI
The ballistic resistance of 2024-T3 and 2024-T351 alloy aluminum flat plates to aircraft engine fragments is evaluated experimentally. Gas and powder gun tests are performed to determine the ballistic speed limit of a spherical steel bullet representing the engine fragment with a diameter of 0.5 inch. The rectangular flat aluminum specimens are prepared as 12 x 12 inch and with three different thickness combinations of 1/16”, 1/8” and 1⁄4”. ...
A FAILURE CRITERION FOR POLYMERS AND SOFT BIOLOGICAL MATERIALS
William W. Feng, John O. Hallquist - Livermore Software Technology Corp.
A failure criterion, for polymers and soft biological materials subjected to very large deformation, is presented in this paper. The criterion is written in terms of the strain invariants in finite elasticity. Experimental tests for determining the failure criterion of a material and some numerical results from LS-DYNA are shown.
A Process of Decoupling and Developing Body Structure for Safety Performance
John M. Madakacherry, Martin B. Isaac, Dr. Charles A. Bruggeman - General Motors
Dr. David Eby - CD-Adapco
Dr. Akbar Farahani - ETA, Inc.
Dr. Ron C. Averill - Red Cedar Technology
This paper describes a novel approach of decoupling and developing local structures for crash performance . The process discussed here enables quick development of local structure to address packaging changes in a mass efficient manner. Hundreds of design choices compatible with other design constraints were evaluated to select the optimized design. Here optimum is defined as the design that met the required parameters (crashworthiness, ...
A semi-analytical model for polymers subjected to high strain rates
A. Haufe - DYNAmore GmbH
P.A. Du Bois - Consulting Engineer
S. Kolling, M. Feucht - DaimlerChrysler AG
Reliable prediction of the behaviour of structures made from polymers is a topic under considerable investigation in engineering practice. Especially, if the structure is subjected to dynamic loading, constitutive models considering the mechanical behaviour properly are still not available in commercial finite element codes. First, we give an overview of material laws for thermoplastics and show how the behaviour can be characterized and ...
A Study Concerning Precision of LS-DYNA Res
Martin Feyereisen, Jeff Zais, Guangye Li - IBM
 
A Study on Yielding Function of Aluminum Honeycomb
Shigeki Kojima - TOYOTA COMMUNICATION SYSTEMS CO., LTD. , Japan
Tsuyoshi Yasuki, Satoshi Mikutsu - Toyota Motor Corporation, Japan
Toshikazu Takatsudo - THE YOKOHAMA RUBBER CO., LTD. , Japan
This paper describes newly developed yielding function of aluminum honeycomb. Physical compression tests of aluminum honeycomb were performed and it was found that yielding stress of aluminum honeycomb highly depended up on direction of compression. Using these test data, a yielding function was newly derived as a function of volumetric change and angle of compression. The yielding function was introduced to MAT126 as an option. ODB ...
A View on the Technology of both Vehicle Content and the Product Creation Process for Supercars
Neil Hannemann - McLaren Automotive
All road cars have benefited from constantly improving technology; many of these improvements are not always obvious to the consumer. In the category of Supercars the improvements can be measured in ways that are exciting to an automotive enthusiast. The improvements most visibly noted are items that are part of the content of the car, such as electronic fuel injection, airbags, and items cars have always had, such as tires. These ...
Accelerating Regulatory Test Simulation with LS- DYNA through Process Guidance Technology
Petter Sahlin, Velayudham Ganesan - ESI Group
With the strength in implementing best practices process guidance technology has proven dramatically reduced lead times in pre and post processing while meeting the increasing complexity imposed by ever changing safety regulations. Using predefined template processes for regulatory tests, for example for Euro NCAP, ACEA, or FMVSS standards, process guidance technology allows users to be driven or guided by ready made test templates for the ...
Acoustic and Vibroacoustic Modeling in LSDYNA Based on Variational BEM
Ahlem Alia - LML, USTL
Mhamed Souli - LSTC
The paper concerns the vibroacoustic simulation based on the acoustic Variational Indirect Boundary Element Method (VIBEM) recently implemented in LSDYNA. In this formulation, which assumes a weak acoustic-structure interaction, the transient structural response is computed first. By applying the FFT, it is transformed into a frequency response. The obtained results are taken as boundary conditions for the acoustic BEM. Consequently, the ...
An Assessment of the LS-DYNA Hourglass Formulations via the 3D Patch Test
Leonard E. Schwer - Schwer Engineering and Consulting Services
Samuel W. Key - FMA Development, LLC
Thomas A. Pučik - Pučik Consulting Services
Lee P. Bindeman - Livermore Software Technology Corporation
The six hourglass formulations available in LS-DYNA for 8 node hexahedral elements are evaluated using the so called ‘3D Patch Test.’. It is demonstrated that three of the six hourglass formulations fail this patch test, including the popular default LS-DYNA viscous form of hourglass control. A detailed description of the 3D Patch Test is provided to allow readers to perform the simple test as part of their code verification.
An Inverse Approach to Identify the Constitutive Model Parameters for Crashworthiness Modeling of Aluminum Honeycombs and Moving Deformable Barriers
Murat Buyuk, Cing-Dao (Steve) Kan, Shaun Kildare, Dhafer Marzougui, Hasan Kurtaran - The George Washington University
 
Application of SynfiniWay Grid Platform for iterative LS-DYNA studies
E. Deguemp - Fujitsu Systems Europe
M. Adoum, V. Lapoujade - CRIL Technology
Whether end-users need to access local or remote systems, to use a batch system or to run jobs interactively, they will always raise the same questions: “Which system can I run my job on?” and “How do I get data to the machine where my job will execute?” Users should only need to know what applications they want to run and where the inputs for these applications are located. To answer these needs, Fujitsu markets a middleware product called ...
Assessment of LS-DYNA Scalability Performance on Cray XD1
Ting-Ting Zhu - Cray Inc.
Technologists worldwide have now recognized that CAE (Computer Aided Engineering) offers an unprecedented opportunity to revolutionize product development. Today, CAE promises not only increased productivity but also faster time-to-market, lower warranty costs and above all, products that are safer, outperform and work better. With the broad acceptance of the MPI based implementation of LS-DYNA, the manufacturing industry is pushing the ...
Automatic Processes for Multiple Analyses
Miles Thornton, Christopher Bell, David Burton, Paul Davidson, Ben Dennis, Roger Hollamby, Richard Sturt - Arup
 
Benefits of Scalable Servers with Global Addressable Memory for Crash Simulation
Christian Tanasescu, Kevin Fox - SGI
 
Birdstrike onto the Composite Intake of a Turbofan Engine
Marco ANGHILERI,Luigi CASTELLETTI, Fabio INVERNIZZI, Marco MASCHERONI - Politecnico di Milano, Italia
Birdstrike is a menace for flight safety likely to have tragic consequences. In view of that, the efforts provided to design high-efficiency bird-proof structures are fully justified. In this work the impact of a standard 4-lb bird onto a nacelle made of composite material required for the certification of the component has been investigated using LS-Dyna 970. Initially, the dynamic behaviour of the composite material used in the ...
Buckling and post-buckling analyses of stiffened composite shells with inter-laminar damages
Aleksandrs Korjakins, Patricia Kara, Kaspars Kalnins - Technical University, Riga
In the present paper buckling and post-buckling response of axially loaded composite stiffened shell with inter-laminar damage regions have been solved using computer code LS-DYNA. Reduced number of layers and reduced stiffness in damaged region has been investigated. In addition skin delamination with contact model has been used for the analysis of the fracture toughness in the damaged regions. Energy release rates are calculated by ...
Comparison of Faceted Vs Ellipsoid Dummies In Frontal Crash Simulations
Hovenga P.E., Spit H.H., Kant A.R., Happee R. - TNO Automotive Safety Solutions
An improved Hybrid-III 50th %ile crash test dummy model has been developed in MADYMO. Advanced multibody techniques have been used to obtain fast computation times with the geometry and potential accuracy of CPU intensive finite element models. So-called facet surfaces have been used in combination with flexible bodies and rigid bodies. The MADYMO contact algorithm has been enhanced with options to separately describe the non-linear ...
Compression of LS-DYNATM1 Simulation Results using FEMZIP©
Clemens-August Thole - Fraunhofer Institute for Algorithms and Scientific Computing
The standard usage of simulation as part of the automotive design process has increased the demand for archiving simulation results. Intensive collaboration during the development process requires the exchange of simulation results. Compression of simulation results reduces the size of archives and the time for data transfers. Like compression of video streams and pictures, the effective compression of simulation results requires specific ...
Computational Biomechanics: a challenge at the engineering /life sciences interface5th
John Middleton, Georges Limbert - Cardiff Medicentre
 
Crash-tests simulations by LS-DYNA code on the HPC AMD64 Cluster
Prof. Nikolay Shabrov, Prof. Yuri Mikhailov, Iliya Lopatukhin,- Saint Petersburg State Polytechnical University, Russia
Dr. Evgeniy Shmelev, Dr. Sergey Kurdyuk - AVTOVAZ Company, Russia
Crash-test simulations of the car models by LS-DYNA code are carried out on the HPC 16 CPU AMD64 Opteron processors Cluster. Simulations are based on the large 3D finite element car models that contain more then one million DOF. Architecture and benchmark of the HPC 16 CPU AMD64 Cluster were tested by engineering applications with commercial engineering codes LS- DYNA instead of synthetic benchmark. For this purposes several tasks ...
Crashworthiness of Conventionally Designed Railway Coaching Stock and Structural Modifications for Enhanced Performance
X. Xue - AEA Technology Rail
F. Schmid - University of Sheffield
In this paper, the authors present a crashworthiness assessment of a conventionally designed railway passenger vehicle and suggest modifications for its improvement. The analytical approach consisted of two stages. Firstly, the crashworthiness of the coach was assessed by simulating a collision between the coach and a rigid wall. Then, after analysing the structural weaknesses, the design of the coach was modified and simulated again in the ...
Current and Future Developments of LS-DYNA
Dr. J. O. Hallquist - Livermore Software Technology Corporation
 
Current Features of LS-PREPOST
LSTC
 
Deformable Rigid Bodies in LS-DYNA with Applications – Merits and Limits
Karl Schweizerhof, Johann Bitzenbauer - University Karlsruhe, Germany
Ulrich Franz - DYNAmore GmbH, Germany
Modal methods are long known in linear dynamic analysis for efficient computations of the response of structures. The mechanical idea behind is to find a particularly useful problem dependent basis (so called eigenfunctions or eigenmodes) which can be separated into some of major importance for the behavior of the structure and others of minor interest (which can be subsequently disregarded). Unfortunately this concept is basically a ...
Design and Implementation of a Multi-Fabric Message Passing Interface (MPI): Intel® MPI Library
Dr. Michael D'Mello - Intel Americas Inc., USA
Environment & Situation Analysis Program direction Intel® MPI Design Considerations – High Level Design – Stability – Functionality – Performance – Portability – Environment & Tools support – Extensibility Highlights of Intel® MPI Program
Developing FE-TIRE Model for Road Noise Simulation
Masaki SHIRAISHI - SRI R&D Ltd.
Kimihiro HAYASHI - The Japan Research Institute,Limited
 
Development of a Numerical Model of an Anthropomorphic Test Device for the Study of Human Related Impact Events
Elisa OLDANI, Emanuele FRACASSO, Luigi-M. L. CASTELLETTI, Marco ANGHILERI - Politecnico di Milano, Italia
The aim of this work is the development and validation of a numerical model of an Anthropomorphic Test Device for the simulation of impact events involving humans and consequently the study and development of crashworthy structures and restraint systems. The research approach consisted in a first validation by subcomponents of the numerical model, comparing the response of the model to the results of experimental tests specifically designed ...
Development of BioRID-II Dummy Model in Cooperation with the German Automotive Industry
Peter Schuster, Sebastian Stahlschmidt, Uli Franz - DYNAmore GmbH
Development of Orbital Debris Impact Protection Panels
M. ANGHILERI, L. CASTELLETTI, F. INVERNIZZI, M. MASCHERONI, F. PIGOLI - Politecnico di Milano, Italia
The presence of debris in the orbits used by artificial satellites represents an actual threat for space operations – as such an event is likely to cause the failure of the satellite. Spacecraft hulls are in general built with honeycomb-cored sandwich panels made of Aluminium alloys - which are not effective as a protection in case of medium size debris impact. Using LS-Dyna 970, the benefits (from a mechanical standpoint) coming from the ...
Experience from Using a New Material Model for Stainless Steels with TRIP-effect
Daniel Hilding - Engineering Research Nordic AB
Erik Schedin - Outokumpu Stainless AB, Avesta Research Centre
This paper presents experience from using a recently developed material model for austenitic stainless steels with TRIP-effect for simulation of sheet metal forming. Results from two different forming operations are presented. In materials with TRIP-effect, a phase transformation from austenite to martensite occurs during forming that significantly affects the hardening behavior. The effect is sensitive to the amount of straining as well as ...
External blast load on structures – Empirical approach
G. Le Blanc, M. Adoum, V. Lapoujade - CRIL TECHNOLOGY
Modeling structures response to blast loads interests more and more people concerned about industrial accidents and/or terrorism. Today, two approaches are available: one can either use an ALE model (*ALE) with a lagrangian-eulerian coupling (*CONSTRAINED_LAGRANGE_IN_SOLID) or a pure lagrangian approach where an analytical loading of the structure replaces the computation of the propagation. The lagrangian approach allows the use of ...
Failure Modes Analysis in the Crash Barrier Simulation
Lei Hou - CELLBOND, UK
The technology of FEA modelling is expanding rapidly in the field of automotive safety analysis. From the pre/post-processing for the material impact to the mathematical equations in the solver the non-linear analysis becomes a vital part of the simulation. In this paper we trace the development of experimental data validated-analysis method for the Cellbond honeycomb barrier model by using LS-Dyna software. The utilization of the database ...
Finite element modelling of the static axial compression and impact testing of square CFRP tubes in LS-DYNA3D
Dimitrios Papapostolou - National Technical University of Athens
LS-DYNA3D finite element code was used for investigating the compressive properties and crushing response of square FRP (Fibre Reinforced Plastic) tubes subjected to static axial compression and impact testing. Several models were created in order to simulate a series of static and dynamic compressive tests that were performed in the National Technical University of Athens (NTUA) using carbon FRP tubes, that were featured by the same ...
Fluid Structure Interaction with *MAT_SOFT_TISSUE and EFG Elements
Rudolf Bötticher - TMB GmbH
This paper presents LS-DYNA 970.5434a transient simulations for the fluid- structure interaction (FSI) in a prototype biomedical duct. Standard and element free Galerkin (EFG) elements are compared for the nearly incompressible membrane out of *MAT_SOFT_TISSUE, which is a composite reinforced hyperelastic material. The coupling of a multi-fluid arbitrary Lagrangian Eulerian (ALE) solid domain to an EFG solid domain is possible and its ...
Fluid-Structure-Interaction Effects in Airbag Out-of- Position Load Cases: An introduction to the ALE- framework in LS-DYNA
Dr. A. Haufe, Dr. K. Weimar - DYNAmore GmbH
 
Further Improvements to the Truck Model for Roadside Safety Simulation – Suspension and Steering
Dustin A. Boesch - Quartus Engineering Inc.
John D. Reid - University of Nebraska-Lincoln
Pickup trucks are commonly used for crash testing of roadside safety hardware, while nonlinear finite element analysis using LS-DYNA is commonly used to simulate that crash testing. To improve the accuracy of simulation a new front suspension and steering system was developed to replace the existing system on a pickup truck model used for roadside safety simulation. All of the critical components, such as mounting points, alignment, track ...
General considerations for the influence of mesh density in LS Dyna
Udo Jankowski, Manfed Sans, Michael Fairchild - TECOSIM GmbH
Accurate and reliable CAE results are essential for the product development process in manufacturing industries. This is particularly so in the automotive industry where virtual simulation predictions are gradually replacing physical testing in the ever greater drive to reduce product development time and costs. CAE is nowadays completely integrated in the development process and critical design decisions are often based on the FEM ...
Grid-Based LS-DYNA Solutions
Henry H. Fong, Jonas Edberg - Sun Microsystems, Inc.
In addition to offering SPARC/Solaris systems for MCAE users, Sun Microsystems also markets Opteron-based servers and workstations. These Opteron solutions offer excellent price/performance for LS-DYNA simulations, and are particularly suitable for clustering. Users have a choice of three operating systems: Solaris 10 x64; Linux (SuSE or Red Hat); or Microsoft Windows. This paper describes briefly these computing systems, and show some ...
Heat Transfer in LS-DYNA
Arthur B. Shapiro - Livermore Software Technology Corporation
LS-Dyna can solve steady state and transient heat transfer problems on 2- dimensional 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., metal forming, welding, casting).
Impact Analysis of a 16t Truck against different Road Safety Restraint Systems
Elisa Oldani, Luigi Castelletti, Marco Anghileri, Mario Mongiardini - Politecnico di Milano, Italia
In this work, the Finite Element model of a 16-ton truck suitable for the numerical analysis of the impact with road safety devices is described. The possibility to correctly reproduce the behaviour of both the vehicle and the barrier before the actual testing is greatly helpful in the design of restraint systems and it can avoid failure of tests. Particular attention was paid in modelling features of the truck such as frame, suspensions ...
Improvement Design of Vehicle’s Front Rails for Dynamic Impact
Chien-Hsun Wu, Chung-Yung Tung, Jaw-Haw Lee - Automotive research & testing center
Caleo C. Tsai - China Motor Corporation
Frontal collision tests indicate that the energy absorbing components playing the main role of providing protection for the occupants during the crashing processing. The frontal rails are the main components to absorb energy during collision. The position of the spot welding, beads, the cross section and thickness of the frontal rails are significantly facts that affect the energy absorption during impact. This paper is concentrated on ...
Integrating LSTC and MSC.Software Technology for Explicit Dynamics and Fluid-Structure Interaction
Erik Plugge - MSC.Software Benelux B.V.
LSTC and MSC.Software have entered a long-term strategic partnership, with the objective of integrating complementary technology to the benefit of the structural and fluid dynamics community. This paper presents some of the technical aspects of this integration, highlights the technologies being used, and demonstrates the new application capabilities being enabled by this partnership. The presentation will focus on two aspects of code ...
Integrative crash simulation of composite structures
Stefan Glaser- Andreas Wüst - Engineering Plastics Europe - KTE
-- Integrative Simulation? - Motivation - Fiber orientation in filling process - Material modelling - Influence of fiber orientation tensor -- Simulation applications - Simulation of material tests - Static loading - Crash loading
LS-DYNA performance on new computing choices from IBM
Guangye Li, Jeff Zais, Greg Clifford - IBM
MODELING of WELDING SEAM SEQUENCES
Sergey Medvedev, Maria Petrushina, Oleg Tchij - National Academy of Sciences of Belarus
This paper explores simulation techniques for prognosis residual strains of welded structures taking into account welding seam sequences. Simplified approaches of welding stress and strain theories were used and implemented on SKIF-family supercomputers. The elaborated program options allow to apply the fictitious shrinkage forces to the weld models of arbitrary space location. The results of the experimental computational verification of ...
Modelling of damage in composite materials using interface elements
W.G. Jiang, S.R. Hallett, M.R. Wisnom - University of Bristol
A simple and robust implementation of an interface element has been addressed in this paper. A new state variable is introduced to trace the extent of damage accumulated at the interface. The element not only simulate mixed mode delamination propagation in composite materials but also satisfactorily deals with mode ratio change during the debonding process. The interface model is implemented in LS-DYNA code. The model has been applied to ...
Modelling of the failure behaviour of windscreens and component tests
D.-Z. Sun, F. Andrieux, A. Ockewitz Fraunhofer Institute for Mechanics of Materials
H. Klamser, J. Hogenmüller - Dr. Ing. h.c. F. Porsche AG
Windscreens from laminated safety glass (glass/PVB interlayer/glass) are widely used in automotive structures and have an important contribution to the stiffness of the vehicle. The stiffness of the laminated safety glass is dominantly given by the two layers of glass while the PVB interlayer serves to fix glass splinters to avoid serious injuries of the passengers in a collision. A finite element model for modelling the failure behaviour ...
Modelling Study to Validate Finite Element Simulation of Railway Vehicle Behaviour in Collisions
X. Xue - AEA Technology Rail
F. Schmid - University of Sheffield
Half-width/full-length and half-width/half-length vehicle models, based on geometrical symmetries, have been adopted widely in the finite element modelling of rolling stock structural behaviour. These techniques have been successful in the analysis of rail vehicles undergoing static loading, such as the proof load test, and in basic impact studies. Until now, such rail vehicle impact tests and associated simulations have been largely ...
Moving Beyond the Finite Elements: A Comparison between Finite Element Methods and Meshless Methods for Modeling Honeycomb Materials and Simulating Side Impact Moving Deformable Barriers
Murat Buyuk,Shaun Kildare,Cing-Dao (Steve) Kan - The George Washington University
Movable Deformable Barriers (MDBs) are used in surrogate tests to represent the behavior of an average midsize vehicle. The main difficulty in MDB modeling is the prediction of frontal energy absorbing barrier, where honeycomb materials are used and usually expected to simulate complex failure modes. In side impact tests, the severe shear deformation of the honeycomb material, full densification of barrier edge, rupture of aluminum cover ...