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5th European LS-DYNA Conference
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External blast load on structures – Empirical approach
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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 ...
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Fluid-Structure-Interaction Effects in Airbag Out-of- Position Load Cases: An introduction to the ALE- framework in LS-DYNA
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Dr. A. Haufe, Dr. K. Weimar - DYNAmore GmbH
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Simulation of Hydrodynamic Ram and Liquid Aeration
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S.C.McCallum, D.D.Townsend - BAE SYSTEMS
During the past several years, research within BAE SYSTEMS has concentrated
on developing a capability for simulating Hydrodynamic Ram (HRAM). In this
paper we demonstrate how the ALE technique in LS-DYNA can be used to
simulate the principal stages of HRAM with liquid aeration.
LS-DYNA is used to simulate the impact of a small steel sphere at 2km/s into a
water-filled container manufactured from 3.2 mm thick aluminium alloy L165. ...
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Birdstrike onto the Composite Intake of a Turbofan Engine
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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 ...
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A FAILURE CRITERION FOR POLYMERS AND SOFT BIOLOGICAL MATERIALS
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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.
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A semi-analytical model for polymers subjected to high strain rates
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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 ...
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Experience from Using a New Material Model for Stainless Steels with TRIP-effect
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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 ...
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Improvement Design of Vehicle’s Front Rails for Dynamic Impact
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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 ...
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Crashworthiness of Conventionally Designed Railway Coaching Stock and Structural Modifications for Enhanced Performance
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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 ...
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Crash-tests simulations by LS-DYNA code on the HPC AMD64 Cluster
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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 ...
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Fluid Structure Interaction with *MAT_SOFT_TISSUE and EFG Elements
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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 ...
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The influence of bird-shape in bird-strike analysis
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S.C. McCallum, C. Constantinou - BAE SYSTEMS
This paper describes the results of simulations to assess the influence of bird
shape during bird-strike. In the first part of this paper, simulations are presented
which compare the results of a traditional bird shape model (hemispherical ended
cylinder) impacting a square flat panel using the ALE and SPH techniques. In
each case the bird is modelled with a mass of 8 lb and has physical dimensions
(torso) representative of a Canadian ...
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Simulation of Wave-Dissipating Mechanism on Submerged Structure using Fluid-Structure Coupling Capability in LS-DYNA
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Sunao Tokura, Tetsuji Ida - The Japan Research Institute, Ltd.
Understanding the wave-dissipating mechanism of seashore structures is
important to design effective seashore protection system against high waves.
From the engineering point of view, wave dissipation with seashore structures is
considered as a kind of fluid-structure interaction (FSI) problem. Recently
constructing a submerged structure "flexible mound" is increasing for some
advantages. The flexible mound is made of rubbery material and ...
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Application of SynfiniWay Grid Platform for iterative LS-DYNA studies
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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 ...
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LS-DYNA performance on new computing choices from IBM
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Guangye Li, Jeff Zais, Greg Clifford - IBM
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Benefits of Scalable Servers with Global Addressable Memory for Crash Simulation
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Christian Tanasescu, Kevin Fox - SGI
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Current Features of LS-PREPOST
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LSTC
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Automatic Processes for Multiple Analyses
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Miles Thornton, Christopher Bell, David Burton, Paul Davidson, Ben Dennis, Roger Hollamby, Richard Sturt - Arup
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General considerations for the influence of mesh density in LS Dyna
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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 ...
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Shape Optimization of a Vehicle Crash-box using LS-OPT
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Marcus Redhe, Larsgunnar Nilsson - Engineering Research Nordic AB
Fredrik Bergman - Saab Automobile AB
Nielen Stander - LSTC
The aim of this project is to optimize the geometry of a crash-box due to impact
at low velocity impact. The optimization problem is solved in LS-OPT, using
Neural Networks as meta-model. The Neural Networks meta-model has been
evaluated on a small test example and it shows remarkable good approximation
of the responses.
The geometry was parameterized using HyperMorph. In addition to the geometry
parameters, the sheet thickness and the ...
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Multidisciplinary Optimisation and the Design for 6 Sigma
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Dr. Tayeb Zeguer - Jaguar Cars Ltd
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The Application of Optimization and Robustness Technology to a Martian Lander Concept
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Paul Sharp,Royston Jones - Altair Engineering Limited
Richard Slade - Astrium Limited
Optimization and robustness technologies provide a gateway for the rapid
assessment of an engineering design. Following the development of a design
concept, optimization technology can automatically modify design variables of
the system (i.e. airbag geometry, vent area etc.) to achieve the optimum
performance characteristics.
Once the design has been optimised, a robustness assessment can be
performed. This culminates in the determination ...
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New Features in LS-OPT Version 3.0
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Nielen Stander, Willem Roux - Livermore Software Technology Corporation
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Integrative crash simulation of composite structures
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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
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Computational Biomechanics: a challenge at the engineering /life sciences interface5th
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John Middleton, Georges Limbert - Cardiff Medicentre
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A View on the Technology of both Vehicle Content and the Product Creation Process for Supercars
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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 ...
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Current and Future Developments of LS-DYNA
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Dr. J. O. Hallquist - Livermore Software Technology Corporation
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Development of Orbital Debris Impact Protection Panels
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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 ...
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Vehicle Roof Crush Modelling & Validation
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Mingzhi Mao, E. C. Chirwa,T. Chen - The University of Bolton, UK
Real roof crush tests, quasi-static or dynamic, have been widely used to evaluate
the safety integration of vehicle structure, especially in the USA, where there are
specified standards such as FMVSS 208 and 216. Europe is endeavouring to
reach the same target for vehicle safety taking into account the different road
condition. However, carrying out full experimental tests is shown to be costly and
in many cases unrepeatable. That is why ...
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Modelling of the failure behaviour of windscreens and component tests
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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 ...
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