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5th European LS-DYNA Conference
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Accelerating Regulatory Test Simulation with LS- DYNA through Process Guidance Technology
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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 ...
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Productivity Gain in Crashworthiness Simulation EASi-CRASH for Complete Safety and Crash Modeling for LS-DYNA
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Shivakumar Shetty, Petter Sahlin - ESI Group
The pre and post-processing for crashworthiness and safety simulation in
automotive development projects is constantly changing. New functionality of the
solver requires evolutionary updates, while the paradox of combining reduced
lead times with an ever increasing range of regulatory tests calls for more
dramatic improvements and innovative approaches.
Hence the changes, the underlying need is constant – to increase productivity in
model ...
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Compression of LS-DYNATM1 Simulation Results using FEMZIP©
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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 ...
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The use of an Oasys PRIMER model management database during accelerated vehicle development programs such as the 2005 Ford GT
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Tim Keer, Simon Iregbu - Arup
The role of CAE (Computer Aided Engineering) in the automotive vehicle
development process continues to grow in importance. CAE has been one of the
key enablers in the recent reduction of vehicle development times, as it allows
less reliance on time-consuming and costly prototype testing. Impact CAE has
been at the forefront of this CAE revolution.
Various additional factors continue to place increased demands on the impact
CAE team:
...
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Buckling and post-buckling analyses of stiffened composite shells with inter-laminar damages
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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 ...
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NUMERICAL SIMULATION OF DAMAGE IN THERMOPLASTIC COMPOSITE MATERIALS
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Kevin Brown - University of Nottingham
Richard Brooks, Nicholas Warrior
Thermoplastic composites are being considered for application in vehicle bumper
and front-end structures for increased pedestrian protection. This paper
describes recent progress in the calibration and validation of LS-DYNATM
material model 162 (*MAT_COMPOSITE_DMG_MSC) for the modelling of
impact damage in the glass/polypropylene commingled fabric thermoplastic
composite, TwintexTM. In this study, MAT 162 is calibrated by using a series ...
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Modelling of damage in composite materials using interface elements
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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 ...
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Simulation of the Crash Performance of Crash Boxes based on Advanced Thermoplastic Composite
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Matthias Hörmann - CADFEM GmbH, Germany
Marco Wacker - Jacob Composite GmbH, Germany
Because of their superior mechanical properties in combination with a relative
low density Fiber Reinforced Composites (FRC) are of great potential in the area
of lightweight structures respectively applications. Consequently FRC is gaining
influence and acceptance not only in the automotive industry. Unfortunately the
application of endless reinforced composites with duroplastic matrix was mainly
restricted by a production technique ...
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Finite element modelling of the static axial compression and impact testing of square CFRP tubes in LS-DYNA3D
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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 ...
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Numerical simulation of ground impact after airdrop
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Yves de Lassat de Pressigny - Centre d’Essais en Vol, MinDef/DGA/DE, France
Vincent Lapoujade - CRIL Technology, France
The airborne forces of many countries use honeycomb paper as energy damping
material (EDM) for heavy cargo airdrop. Its roughly constant crushing resistance
makes the dimensioning of the kinetic energy absorber layer quite easy.
Yet the velocity and attitude of a parachute at ground impact is variable, due to
weather conditions, or undamped pendulum movement of the load under the
parachutes. Those parameters have a big influence on the ...
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MODELING of WELDING SEAM SEQUENCES
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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 ...
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Self-piercing riveting
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Andre Stühmeyer - CAD-FEM GmbH
Overview
• The self piercing riveting process
• FE analysis of the joining process
– Large deformation
– Material failure
– 2D remeshing approach
– 3D remeshing approach
• Comparison with experiments
• Process optimization with FEA
• Summary
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A Process of Decoupling and Developing Body Structure for Safety Performance
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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, ...
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Developing FE-TIRE Model for Road Noise Simulation
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Masaki SHIRAISHI - SRI R&D Ltd.
Kimihiro HAYASHI - The Japan Research Institute,Limited
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Deformable Rigid Bodies in LS-DYNA with Applications – Merits and Limits
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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 ...
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The “Shaken Baby” Syndrome; Computational Studies of a New Hypothesis of its Cause
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J.Cheng, S. Cirovic, I.C. Howard, A. Yoxall, M.A. Parsons - The University of Sheffield
The term “shaken baby syndrome” refers to a unique pattern of non-accidental
traumatic injury occurring in children by shaking. Typical injuries include subdural
haemorrhage, retinal haemorrhage as well as tears to cortical bridging veins.
Infants younger than 6 months are significantly more vulnerable to the shaken
baby syndrome than older infants and children, a fact that has been difficult to
reconcile with all previous explanations of ...
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Numerical simulation the bottom structures grounding test by LS-DYNA
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Ainian Zhang, Katsuyuki Suzuki - The University of Tokyo,
Nonlinear finite element method (FEM) is a powerful tool for analyzing ship
collision and grounding problems. The reliability of the numerical simulation
results largely depends on the proper definition of problem and careful control of
some critical parameters. The purpose of the paper is to study the effect of
selected parameters on crashworthiness of the single-hull bottom structure due
to raking. The quasi-static grounding process is ...
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Heat Transfer in LS-DYNA
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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).
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A Study Concerning Precision of LS-DYNA Res
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Martin Feyereisen, Jeff Zais, Guangye Li - IBM
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MPP Implicit for LS-DYNA v. 971
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Cleve Ashcraft, Roger Grimes, Bob Lucas - LSTC
The Vision
• LSTC wants to provide a single package that
allows users to perform all of their analyses.
– Implicit computations must be integrated with
explicit
– Linear analyses (useful for debugging large models)
must be integrated as well.
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An Assessment of the LS-DYNA Hourglass Formulations via the 3D Patch Test
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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.
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Integrating LSTC and MSC.Software Technology for Explicit Dynamics and Fluid-Structure Interaction
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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 ...
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Acoustic and Vibroacoustic Modeling in LSDYNA Based on Variational BEM
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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 ...
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Using LS-DYNA Implicit for Metal Forming Applications
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Cleve Ashcraft, Roger Grimes, Xinhai Zhu - LSTC
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Tool Design for a High Strength Steel Side Impact Beam with Springback Compensation
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Trevor Dutton - Dutton Simulation Ltd
Richard Edwards, Andy Blowey - Wagon Automotive Ltd
Prediction of formability for sheet metal pressings has advanced to a high state of
confidence in recent years. The major challenge is now to predict springback
and, moreover, to assist in the design of tooling to correctly compensate for
springback. This is particularly the case for materials now being routinely
considered for automotive production, such as aluminium and ultra high strength
steels, which are prone to greater degrees of ...
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Recent Development for Metal Forming Simulation
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Yasuyoshi Umezu, Ninshu Ma - The Japan Research Institute, Ltd., Japan
Since 1996, Japan Research Institute Limited (JRI) has been providing a sheet
metal forming simulation system called JSTAMP-Works packaged the FEM
solvers of LS-DYNA and JOH/NIKE3D, which might be the first multistage
system at that time and has been enjoying good reputation among users in
Japan. To match the recent needs, “faster, more accurate and easier”, of
process designers and CAE engineers, a new metal forming simulation ...
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The thick shell element type 3
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Andre Stühmeyer - CAD-FEM GmbH
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Development of BioRID-II Dummy Model in Cooperation with the German Automotive Industry
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Peter Schuster, Sebastian Stahlschmidt, Uli Franz - DYNAmore GmbH
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Comparison of Faceted Vs Ellipsoid Dummies In Frontal Crash Simulations
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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 ...
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WorldSID 50th The Next Generation Side Impact Dummy
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Bhavik Shah, Yi Liu - FTSS
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Development of a Numerical Model of an Anthropomorphic Test Device for the Study of Human Related Impact Events
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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 ...
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The Optimization of the LSTC Hybrid III Dummies to enhance the numerical stability and to fulfill the current standards
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Wolfgang Lietz - CAD-FEM GmbH
• Many years ago LSTC developed Hybrid III-Dummies. One
group of these have on the outer surface deformable parts. The
dummies are free and without charge for user’s of LS-DYNA.
• In the last years on on hand the dummies changed and on the
other hand the expectations on the dummies were growing.
• This paper describes the the overall validation and optimization
process of the whole dummy and in detail the optimization work
for ...
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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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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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Validating Material Information for Stochastic Crash Simulation Part 1: Quasi-Static Properties
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P.K.C Wood, C. A. Schley, S. Kenny - University of Warwick
T. Dutton - Dutton Simulation
This paper describes the steps in validating material information for stochastic
simulation using a quaisi-static tensile test experiment. Sources of physical noise
usually present in a testing environment such as variation in material properties,
geometry and boundary conditions are included as inputs to Finite Element
models.
This work is carried out in the context of a research project supported by the
Automotive Industry in the ...
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On the Optimization of the Punch-Die Shape: An Application of New Concepts of Tools Geometry Alteration for Springback Compensation
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A. Accotto, G. Anedda, M. Sperati, R. Vadori - Altair Engineering Srl
This work here presented concerns the activities of stamping tools alterations of
an automotive component done thanks optimization technologies. The process of
nominal geometry alteration of a complete stamping die is traditionally based on
the experience of the try-out people who manually modify the tools in order to
compensate geometrical differences due to springback under a Trial-and-Error
approach and often the restroking die needs so ...
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Topology optimization in crashworthiness design
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Larsgunnar Nilsson - Engineering Research Nordic AB and University of Linköping
Jimmy Forsberg - University of Linköping
Topology optimization has developed rapidly, primarily with application on linear
elastic structures subjected to static loadcases. In its basic form an approximated
optimization problem is formulated using analytical or semi-analytical methods in
order to perform the sensitivity analysis. When an explicit finite element method
is used to solve contact-impact problems, the sensitivities cannot easily be found.
Therefore, an alternative ...
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Side Member Crumple Section Simulation and Structural Optimization
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Taian Chen, Clive Chirwa, Wei Wang, M. Mao - The University of Bolton
Energy absorbing structural component in a car front impact
The study shows the energy management of the front end structure
it’s stiffness, strength and crush mode as function of occupant load.
A well designed front end structure will have loads well below the
tolerance limit of actual injury criteria (FMVSS 208, ECE R94)
Progressive tube axial crushing and s-shape tube bending are
commonly used as energy absorbers
This paper presents ...
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A Computational and Experimental Analysis of Ballistic Impact to Sheet Metal Aircraft Structures
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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”. ...
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Post-test simulation of airliner wing access panel subject to tyre debris impact
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R. S. Birch, D. Karagiozova, R. A. W. Mines - University of Liverpool
C. Bergler, M. Kracht - CADFEM GmbH
The purpose of the investigations described in this paper is a simulation
approach for tyre debris impact on wing access panels. Aircraft tyre rubber has a
complex structure containing directional layers of nylon reinforcement embedded
in the rubber matrix. Material properties of the compound have been derived from
quasistatic compression and tensile tests with specimen cut in circumferential
and axial direction of the tyre, i.e. with ...
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Perforation of Composite Floors
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William Algaard, John Lyle, Conrad Izatt - Arup
Rapid construction methods for multi storey buildings involve maximising the
tasks that can be carried out simultaneously on site. The risks of construction
workers, fitting out lower floors, being hit by large objects dropped during
installation can be managed by understanding the protection provided by the
intermediate floors. This paper describes a Finite Element based methodology for
assessing the impact event using LS-Dyna. The aim of ...
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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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