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7th International LS-DYNA Conference
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Dynamic Pulsebuckling Analysis of FRP Composite Laminated Beams Using LS-DYNA
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Zheng Zhang, Farid Taheri - Dalhousie University
Buckling and post-buckling of composite structures have been important research topics since composite materials
became widely used in engineering. As a result, significant volume of research has been done on their static stability,
while relatively less has been devoted on characterizing their dynamic buckling and post-buckling response. The
literature became particularly scares when considering the dynamic pulsebuckling and post buckling of ...
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COMPUTATIONAL MICRO-MECHANICAL MODEL OF FLEXIBLE WOVEN FABRIC FOR FINITE ELEMENT IMPACT SIMULATION
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Ala Tabiei, Ivelin Ivanov - University of Cincinnati
This work presents a computational material model of flexible woven fabric for
finite element impact analysis and simulation. The model is implemented in the
nonlinear dynamic explicit finite element code LSDYNA. The material model
derivation utilizes the micro-mechanical approach and the homogenization
technique usually used in composite material models. The model accounts for
reorientation of the yarns and the fabric architecture. The ...
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AN LS-DYNA USER DEFINED MATERIAL MODEL FOR LOOSELY WOVEN FABRIC WITH NON-ORTHOGONAL VARYING WEFT AND WARP ANGLE
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Marlin Brueggert, Romil R. Tanov - Center for Advanced Product Evaluation, Division of IMMI
The behavior of loosely woven fabrics (LWF) differs significantly from other types of woven
fabric materials, the major difference being the significant change that the angle between the weft
and warp fibers undergoes as the fabric stretching forces change. These unique characteristics have
made the LWF a very important part for the functionality of some recently developed occupant
protection safety devices for the automotive and heavy ...
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Stochastic Analysis and Optimization of Full Vehicle System for Offset Crush
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Hassan El-Hor, Nagappan Sekappan, Hamid Keshtkar - DaimlerChrysler Corporation
This paper attempts to account for the uncertainties inherited in the parameters involved in the offset crush of full
vehicle system. The main objective of this work is to perform a reliability-based analysis to obtain the statistical
characteristics of dash and toe intrusion responses in a 40 mph offset crush for a full vehicle system due to
manufacture, material and design variability that will be defined in this study. Monte Carlo ...
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Developing FE-Tire Model Library for Durability and Crash Simulations
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Masaki Shiraishi, Naoaki Iwasaki - Sumitomo Rubber Industries, LTD
Tomoharu Saruwatari, Kimihiro Hayashi - The Japan Research Institute,Ltd.
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EXPERIMENTAL AND NUMERICAL COMPRESSIVE TESTING OF ALUMINUM FOAM FILLED MILD STEEL TUBULAR HAT SECTIONS
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William Altenhof, Rita Turchi - University of Windsor
Anne-Marie Harte - Cymat Corp
This research deals with the experimental and numerical testing of aluminum foam filled mild steel tubular hat
sections under axial compression conditions. The presence of aluminum foam within the tubular hat section
provides a means of stabilizing the buckling process of the tube under axial compression. This method of applying
internal support allows for a greater number of folds to be observed in the axial crushing of the hat sections ...
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RESPONSE SURFACE AND SENSITIVITY-BASED OPTIMIZATION IN LS-OPT: A BENCHMARK STUDY
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Nielen Stander - Livermore Software Technology Corporation
K.J. Craig - University of Pretoria
This paper evaluates the robustness of LS-OPT for response surface and design sensitivity-based
optimization. The methodology uses linear response surfaces constructed in a subregion of the
design space. These are constructed using either a design of experiments approach with a
D-optimal experimental design or the available analytical or numerical gradient. The approach
utilizes a domain reduction scheme to converge to an optimum. The scheme ...
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USE OF STOCHASTIC ANALYSIS FOR FMVSS210 SIMULATION READINESS FOR CORRELATION TO HARDWARE TESTING
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Amit Sharma, Ashok Deshpande, Raviraj Nayak - General Motors Corporation
The FMVSS210 regulation establishes requirements for seat belt assembly anchorage. The Federal government
mandate requires use of Pelvic and Torso Body Blocks for testing belt anchor strengths for lap and shoulder belts
respectively. The belt anchorages are to be designed to withstand loads of 13.34 kN if both lap and shoulder belts
are used and 22.24 kN if only lap belts are used. The analytical simulation of the hardware test is done using ...
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An Application of LS-DYNA for the New FMVSS 208 Front Impact Tests
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Charlotte Jamte, Tim Keer, Richard Maloney, Joshua Weage - Arup
The automotive safety community is currently facing the challenge of new front impact legislation
(FMVSS 208), to be introduced in the USA in 2004. Vehicles will be subjected to an increased number
of and type of barrier tests. This paper describes a new technique, using LS-DYNA, to aid the vehicle
development process. A virtual “sled” has been developed for analysis of the different FMVSS 208
impact scenarios. This sled model would ...
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Finite Element Simulations and Testing of Washington State Precast Concrete Barrier
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Akram Abu-Odeh, D. Lance Bullard - Texas Transportation Institute
Richard B. Albin - Washington State Department of Transportation
Since the early 1970’s, the Washington State Department of Transportation (WSDOT) has used precast
concrete barrier (as shown in Figure 1) for both temporary and permanent installations. The use of this barrier in
high impact areas has increased through the years and is one of the primary barriers currently used on Washington
State highways due to its inherit ease of installation and repair.
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SHAPE OPTIMIZATION OF CRASHWORTHY STRUCTURES
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D. J. Eby, R. S. Sidhu - Applied Computational Design Associates, Inc.
R.C. Averill, E.D. Goodman - Department of Mechanical Engineering
Crashworthiness problems, which are highly dynamic and nonlinear, do not lend themselves well to classical
gradient optimization techniques. Evolutionary-based design approaches that employ a form of guided stochastic
search algorithm have been successfully applied to these problems. While many design optimization approaches are
limited to a small number of continuous design variables, the approach described here can productively search ...
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Honeycomb Modeling for Side Impact Moving Deformable Barrier (MDB)
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Moisey B. Shkolnikov
Usually honeycomb is used as an energy absorber under impact loads. LS-DYNA constitutive model MAT-26
(*MAT_HONEYCOMB) is to mathematically model honeycomb as an energy absorber. The NHTSA MDB is a
physical model of a typical impacting vehicle in side impact tests. The frontal part of MDB is made of honeycomb
not just as an energy absorber but as a physical model of a typical car front end. Therefore, here the use of MAT-26
has some ...
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DEVELOPMENT OF THE DYNA3D SIMULATION CODE WITH AUTOMATED FRACTURE PROCEDURE FOR BRICK ELEMENTS
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Ala Tabiei, Jin Wu - University of Cincinnati
Numerical simulation of cracked structures is an important aspect in structural safety assessment.
In recent years, there has been an increasing rate of development of numerical codes for
modeling fracture procedure. The subject of this investigation is implementing automated
fracture models in the DYNA3D nonlinear explicit finite element code to simulate pseudo 3-D
crack growth procedure. The implemented models have the capabilities of ...
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DEVELOPMENT OF A COUPLED FINITE ELEMENT AND MESH-FREE METHOD IN LS-DYNA
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Cheng-Tang Wu - Livermore Software Technology Corporation
Mark E. Botkin, Hui-Ping Wang - GM R & D Center
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Processing of Equality Constraints for Implicit in LS-DYNA v. 970
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C. Cleve Ashcraft, Roger G. Grimes, Bradley N. Maker - Livermore Software Technology Corporation
LSTC is committed to building an implicit capability into LS-DYNA that is as capable as the flagship explicit
capability. Over the years LSTC has added many different types of constraint handling capabilities in explicit that
now have to be handled by implicit. The vast majority of these constraints are equality constraints imposed on the
linear or nonlinear solution required at each time step. We will describe a new approach for handling ...
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AN UPDATED TOOLBOX FOR VALIDATION AND UNCERTAINTY QUANTIFICATION OF NONLINEAR FINITE ELEMENT MODELS
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Keng C. Yap, G. Wije Wathugala, Timothy K. Hasselman - ACTA Inc.
It is becoming commonplace to use numerical simulations supported by limited experimentation for the
characterization of physical phenomena. This trend, with its perceived potential for reducing costs, is the basis for
the simulation-based procurement initiatives currently gaining momentum within the government and industry.
Insuring the quantitative viability of a simulation-based procurement still requires some experimental data upon
which ...
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MODAL METHODS FOR TRANSIENT DYNAMIC ANALYSIS IN LS-DYNA
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Bradley N. Maker, David J. Benson - Livermore Software Technology Corporation
Modal analysis methods offer an opportunity for tremendous cost savings compared to traditional explicit
approaches to transient dynamic analysis. Modal methods approximate the structural response of a body by a linear
combination of pre-computed mode shapes, eliminating the need for explicit element processing. LS-DYNA’s new
modal analysis capability is combined with existing rigid body features to offer the additional advantage of ...
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Validation of a Loading Model for Simulating Blast Mine Effects on Armoured Vehicles
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Kevin Williams, Robert Durocher, Benoit St-Jean, Jocelyn Tremblay - Defence R&D Canada - Valcartier
Scott McClennan - University of British Columbia
An ongoing program at Defence R&D Canada to reduce the vulnerability of Light Armoured Vehicle (LAVs) to
anti-vehicular blast mines is relying heavily on LS-DYNA to help design and optimize add-on armour systems. A
significant challenge in the numerical modelling work is the development of an accurate, or at least representative,
loading history for the pressure and momentum transfer from the detonation of a buried blast mine. ...
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SHIP STRUCTURES SUBJECT TO HIGH EXPLOSIVE DETONATION
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Mark Z. Vulitsky, Zvi H. Karni - John J. McMullen Associates
Predicting the structural response of a naval vessel to a high explosive detonation is an important requirement in
naval shipbuilding. Unfortunately, current analysis methods do not provide high level of confidence leading to the
utilization of large structural design safety factors. As a result, ships are heavier and more expensive to construct
and maintain than may actually be required. Moreover, more reliable predictions can support ...
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BALLISTIC IMPACT MODELING OF COMPOSITE MATERIALS
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Chian-Fong Yen - Materials Sciences Corporation
A computational constitutive model has been developed to characterize the progressive failure be-
haviors of composite laminates under high velocity ballistic impact conditions. The composite
failure model has been implemented within LS-DYNA as a regular material subroutine. The inte-
grated code was successfully utilized to predict the damage and ballistic behavior of composite
laminates subjected to various ballistic impact conditions. The ...
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Numerical Simulation of Light Armoured Vehicle Occupant Vulnerability to Anti-Vehicle Mine Blast
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Kevin Williams - Defence R&D Canada - Valcartier
Francois Fillion-Gourdeau - Université Laval
An ongoing program at Defence R&D Canada to reduce the vulnerability of Light Armoured Vehicle (LAVs) to
anti-vehicular blast mines is relying heavily on numerical simulation to help design and optimize add-on armour
systems. One of the greatest challenges faced during the evaluation of the vulnerability of a given vehicle to blast
mines is not only assessing the structural response of the vehicle but also evaluating the injuries sustained by ...
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3D Numerical Simulations of Penetration of Oil-Well Perforator into Concrete Targets
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Qiankun Jin, Zheng Shigui, Gary Ding, Yianjun, Cui Binggui - Beijing Engineering Software Technology Co., Ltd.
The oil-well perforator and its interaction with concrete targets are simulated with
fluid-structure coupling algorithm and the new mesh motion option of the multi-material ALE
formulation of LS-DYNA[1] in Version 960. Comparison of the simulation results to the
experimental test data has been conducted. The simulation results show good correlation with data
in tests and indicate that LS-DYNA can be used as an engineering tool to help in the ...
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High Performance Computing with Microsoft Windows: Meeting the Computational Requirements of Engineering Applications
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David A. Lifka - Cornell University
The Cornell Theory Center (CTC) ran proprietary UNIX-based systems from IBM, SGI and
others for over ten years as a national supercomputing center. Today, CTC is operating the
world's largest Windows® scale-out systems with improved reliability, manageability, and total
cost of ownership.
This presentation focuses on the experience, benefits, and issues and key components for success
CTC had moving from proprietary big-iron to ...
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Web-Centric LS-DYNA - Development of a Technical Computing Portal
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Dan Fraser, Youn-Seo Roh, Henry H. Fong - Sun Microsystems, Inc.
The development of a Technical Computing Portal (TCP) for monitoring and managing of LS-
DYNA runs is described. The Sun TCP is a new collaborative tool for High Performance and
Technical Computing. It facilitates access, workload distribution, job monitoring, and
management of LS-DYNA and other technical application jobs in a heterogeneous computing
environment. It can be easily customized by LS-DYNA users, and by LSTC and its ...
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Performance Analysis and Tuning of LS-DYNA* for Intel® Processor-Based Clusters
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George Chaltas - Intel Corporation
W. R. Magro - Intel Americas
Using Intel software tools, including Intel® VTuneTM Performance Analyzer and Intel® Fortran Compiler, we
analyze and tune the performance of MPP LS-DYNA* for clusters of Intel processors. We discuss the impact of
various performance features of Intel processor-based systems, including vector/streaming instructions, on real LS-
DYNA workloads. We compare single-precision performance and measure the impact of various cluster
interconnect ...
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Numerical Differences Observed Due to Different Binaries of LS-DYNA and Due to the Use of Various Compiler Options
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Guangye Li, Wei David Chen, Jeff Zais - IBM
This paper compares the numerical results generated with different versions of LS-DYNA,
including SMP versions ls950d, ls950e, ls960 (all with single precision), SMP version ls960 with
double precision, and the MPI version mpp960. The car crash simulation model used in this
study is the Neon model generated by the National Crash Analysis Center. The plotted results
include internal energies, sliding interface energies, displacements, ...
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Performance Evaluation on the ALE Formulation in MPP LS-DYNA
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Yih-Yih Lin - Hewlett-Packard Company
The ALE fluid-structure coupling capability in LS-DYNA has become the main tool to accurately simulate
the airbag-inflating process. However, it is very time-consuming: Running serially, it has been observed to
take more than ten days on various computer platforms. Hoping to obtain speedup by parallelization, LSTC
has been making efforts to implement the ALE formulation with MPP LS-DYNA. In this paper, the
scalability of this implementation, ...
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PARAMETRIC FINITE ELEMENT MODEL OF A SPORTS UTILITY VEHICLE - DEVELOPMENT AND VALIDATION
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Gustavo A. Aramayo - Computation Materials Science Group
Matthew H. Koebbe - XYZ Scientific Applications, Inc.
As part of the NCAP (New Car Assessment Program) a finite element model of a Ford Explorer SUV has been
developed using a formulation that results in a model with arbitrary element size and element size distribution. This correct Abstract.
model enables the developer and analyst to choose a finite element model most applicable to the specific crash
scenario under study. The element size and element distribution are parametrically defined at ...
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A MOOSE CRASH DUMMY FOR LS-DYNA
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Larsgunnar Nilsson, Anders Jernberg - Engineering Research Nordic AB
The vehicle to moose impact constitutes a serious traffic problem in the Nordic Countries. Thus, in addition to the
conventional requirements on crashworthiness, a Swedish car is also supposed to protect the occupants in the case of
a moose impact.
The Swedish National Road and Transport Research Institute (VTI) has developed a moose crash test dummy,
which has shown to have a similar impact behaviour on the vehicle as a real moose. The main ...
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PAB Deployment Simulation with Curved Retainer
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Linhuo Shi - TG North America Corporation
Some passenger side airbags (PAB) are mounted on the cylindrical inflator directly through
retainer with similar curvature of the inflator. To accurately simulate the deployment of such a
PAB, a fine-tuned model using additional constraints in LS-DYNA are employed in this paper to
simulate the curved mounted PAB. The results from the fine-tuned model are compared with the
simulation results from the PAB models with simply fixed bag mouth. It ...
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