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New Features in LS-OPT Version 3.0
Nielen Stander, Willem Roux - Livermore Software Technology Corporation
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The Application of Optimization and Robustness Technology to a Martian Lander Concept
Paul Sharp,Royston Jones - Altair Engineering Limited
Richard Slade - Astrium Limited
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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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Multidisciplinary Optimisation and the Design for 6 Sigma
Dr. Tayeb Zeguer - Jaguar Cars Ltd
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Shape Optimization of a Vehicle Crash-box using LS-OPT
Marcus Redhe, Larsgunnar Nilsson - Engineering Research Nordic AB
Fredrik Bergman - Saab Automobile AB
Nielen Stander - LSTC
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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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On the Optimization of the Punch-Die Shape: An Application of New Concepts of Tools Geometry Alteration for Springback Compensation
A. Accotto, G. Anedda, M. Sperati, R. Vadori - Altair Engineering Srl
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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
Larsgunnar Nilsson - Engineering Research Nordic AB and University of Linköping
Jimmy Forsberg - University of Linköping
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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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Validating Material Information for Stochastic Crash Simulation Part 1: Quasi-Static Properties
P.K.C Wood, C. A. Schley, S. Kenny - University of Warwick
T. Dutton - Dutton Simulation
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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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Side Member Crumple Section Simulation and Structural Optimization
Taian Chen, Clive Chirwa, Wei Wang, M. Mao - The University of Bolton
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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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Post-test simulation of airliner wing access panel subject to tyre debris impact
R. S. Birch, D. Karagiozova, R. A. W. Mines - University of Liverpool
C. Bergler, M. Kracht - CADFEM GmbH
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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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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
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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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Perforation of Composite Floors
William Algaard, John Lyle, Conrad Izatt - Arup
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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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Compression of LS-DYNATM1 Simulation Results using FEMZIP©
Clemens-August Thole - Fraunhofer Institute for Algorithms and Scientific Computing
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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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Productivity Gain in Crashworthiness Simulation EASi-CRASH for Complete Safety and Crash Modeling for LS-DYNA
Shivakumar Shetty, Petter Sahlin - ESI Group
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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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The use of an Oasys PRIMER model management database during accelerated vehicle development programs such as the 2005 Ford GT
Tim Keer, Simon Iregbu - Arup
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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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Accelerating Regulatory Test Simulation with LS- DYNA through Process Guidance Technology
Petter Sahlin, Velayudham Ganesan - ESI Group
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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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Computational Biomechanics: a challenge at the engineering /life sciences interface5th
John Middleton, Georges Limbert - Cardiff Medicentre
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Current and Future Developments of LS-DYNA
Dr. J. O. Hallquist - Livermore Software Technology Corporation
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A View on the Technology of both Vehicle Content and the Product Creation Process for Supercars
Neil Hannemann - McLaren Automotive
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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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Integrative crash simulation of composite structures
Stefan Glaser- Andreas Wüst - Engineering Plastics Europe - KTE
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-- 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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Buckling and post-buckling analyses of stiffened composite shells with inter-laminar damages
Aleksandrs Korjakins, Patricia Kara, Kaspars Kalnins - Technical University, Riga
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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
Kevin Brown - University of Nottingham
Richard Brooks, Nicholas Warrior
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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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Simulation of the Crash Performance of Crash Boxes based on Advanced Thermoplastic Composite
Matthias Hörmann - CADFEM GmbH, Germany
Marco Wacker - Jacob Composite GmbH, Germany
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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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Modelling of damage in composite materials using interface elements
W.G. Jiang, S.R. Hallett, M.R. Wisnom - University of Bristol
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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 Hydrodynamic Ram and Liquid Aeration
S.C.McCallum, D.D.Townsend - BAE SYSTEMS
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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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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
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External blast load on structures – Empirical approach
G. Le Blanc, M. Adoum, V. Lapoujade - CRIL TECHNOLOGY
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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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Birdstrike onto the Composite Intake of a Turbofan Engine
Marco ANGHILERI,Luigi CASTELLETTI, Fabio INVERNIZZI, Marco MASCHERONI - Politecnico di Milano, Italia
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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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Self-piercing riveting
Andre Stühmeyer - CAD-FEM GmbH
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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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Numerical simulation of ground impact after airdrop
Yves de Lassat de Pressigny - Centre d’Essais en Vol, MinDef/DGA/DE, France
Vincent Lapoujade - CRIL Technology, France
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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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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
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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 ...
