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LS-DYNA Features for Hot Stamping
Arthur B. Shapiro - LSTC
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LS-971 has several new features to model the hot stamping process. A thick thermal shell
formulation allows modeling a temperature gradient through the thickness of the shell. The new
keyword, *MAT_ADD_THERMAL_EXPANSION, allows calculating thermal strains for all the
mechanical material models. A new feature has been added to thermal contact which turns off
thermal boundary conditions when surfaces come in contact. A new thermal one-way ...
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Alternative Models of the Offset and Side Impact Deformable Barriers
Dr. Tore Tryland - Hydro Automotive Structures
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The deformable barriers consist mainly of honeycomb blocks with highly anisotropic behaviour. These parts are
made from several layers with aluminium foil that is glued and stretched to form the honeycomb structure. Simple
compression tests show high stiffness and strength when the cell structure is folded while both stiffness and strength
are significantly lower when the deformation mode is mainly bending of the thin foil. Remember that the ...
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A New Way for Multi-piece and Multi-hit Fragment Impact Simulation Using LS-DYNA
Xudong Xin - Karagozian and Case
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The kinetic feature of weapon fragment is many small masses traveling at extremely high velocities and scattering
radially from the explosion center. To simplify the fragment impact analysis, people often convert the fragment
momentum into a triangular pressure load with very high magnitude and very short duration, and apply the load
directly onto the target. This method may over- or under-predict the impact response due to the complicacy ...
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A User-Defined Element Interface in LS-DYNA v971
Thomas Borrvall - Engineering Research Nordic AB
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The user-defined features in LS-DYNA are powerful tools that allow users in academia or industry to verify
research results in the context of general and complicated finite element applications. Implementation work
concerns only the special field of interest, and there is no need for the comprehensive task of developing and
maintaining the complete finite element software. One of the new user-defined features in LS-DYNA v971 is ...
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Development and Implementation of an Advanced User Material Model for UHMWPE
J.S. Bergström, A.E. Bowden - Exponent, Inc
C.M. Rimnac - Case Western Reserve University, USA
S.M. Kurtz - Drexel University, USA
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Ultra-high molecular weight polyethylene (UHMWPE) is a semi-crystalline polymer with excellent strength, impact
resistance, and abrasion resistance. These mechanical properties have led to extensive use of UHMWPE as a
bearing material in total joint replacements. In order to accurately capture the experimentally observed response of
this important polymer we have developed a new advanced material model—the Hybrid Model (HM). ...
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Investigating the Vibration Behavior and Sound of Church Bells Considering Ornaments and Reliefs Using LS-DYNA
Alexander Siebert, Gunther Blankenhorn, Karl Schweizerhof - University Karlsruhe, Germany
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A numerical investigation of the vibration behavior and the sound of a specific bell is performed and validated by
experimental modal analysis. In the numerical simulations a number of modifications of the geometry mimicking or-
naments and reliefs is investigated as such ornaments have lead to mistunes in a very popular case in Germany. It is
also shown, how the influence of ornaments on the modification of eigenfrequencies can be ...
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An Objectivity Algorithm for Strain Softening Material Models
Mauricio V. Donadon, Lorenzo Iannucci - Imperial College London
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Predictive techniques for the analysis and design of metallic or composite components and structures subject to
severe loading can lead to significant mesh sensitivity if cracking or tearing or penetration occurs. This is especially
important for composite materials in which the material has an elastic brittle response with little or no plastic
behaviour, in which energy could be dissipated. Hence, the full potential use of composite in the ...
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New Features in LS-OPT® Version 3
Nielen Stander, Willem Roux - Livermore Software Technology Corporation
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An overview of LS-OPT features is given with special emphasis on new features available in LS-OPT Version 3.1.
The main features added to Version 3 include discrete optimization, 3-D metamodel plotting, additional statistics
features, and a simplification of parameter identification. LS-OPT is now available for MS Windows®.
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Flexible Body Suspension System Modeling and Simulation Using MD Nastran SOL700 in VPG Environment
Casey Heydari, Ted Pawela - MSC.Software Corporation
Tim Palmer, Arthur Tang - Engineering Technology Associates, Inc.
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Automobile durability and fatigue life prediction depend on road load generation approaches
including proving ground testing, laboratory measurement and CAE simulations. Traditionally,
the road load simulations are done with ADAMS using rigid body and modal flexible body
approaches. With the newly available MD Nastran SOL700 capability, a new approach of using
FEA-based flexible body modeling for suspension systems will be an attractive ...
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Comparison of LS-DYNA and NISA in Solving Dynamic Pulse Buckling Problems in Laminated Composite Beams
Haipeng Han, Farid Taheri - Dalhousie University, Canada
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In this paper the dynamic pulse buckling of laminated composite beams was analyzed using LS-DYNA and
another widely used commercial FE code, namely NISA (Ver.12), developed by EMRC (Engineering Mechanics
Research Corp). Two types of impact loadings that could induce dynamic pulse buckling of composite beams were
analyzed. The first one was a force applied to the structure in a very short duration (i.e., an impulse load). The
other one was ...
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Structural Design and Analysis of Hit-To-Kill Projectile
Michael M. Chen - U.S. Army Research Laboratory
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This paper introduces the very first step on the development of a guided ammunition system. It presents high level
physics based simulations of a guided 60-mm projectile system, which intention is to enable the sub-projectile to hit
and kill an incoming hostile missile at an extended range within a very limited time frame. The projectile requires a
very high muzzle exit velocity in order to carry out the mission. Due to high inertia loads ...
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Development of Simplified Truck Chassis Model for Crashworthiness Analysis
Yucheng Liu, M. L. Day - University of Louisville, USA
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In this paper bending resistance of thin-walled channel beam is applied to create simplified model for truck chassis.
In the simplified model, beam and nonlinear spring elements are used to model the side-rails, and equivalent beams
are applied to represent the cross members. Both detailed and simplified models are used for crashworthiness
analyses, and the results are recorded and compared. Relatively good agreement is achieved between ...
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A Study on a Multi-Disciplinary Optimization Method for the PMP
Soon-Young Seo, Jae-Woo Jeong, Dong-Hyeob Cho, Hyuk Kim - Samsung Electronics Co. Ltd.
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In the mobile electronic appliances market, the feature of products is getting smaller, thinner and more multi-
functional. Therefore, mobile products are easily damaged from drop/impact and thermal cycling load. To make
them more reliable under these conditions, the junction area between chips and PCB should be designed to bear up
under drop/impact. And the heat caused by main chip (Memory & DMB channel chip) should be dissipated as
quickly ...
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Honeycomb Sandwich Material Modeling for Dynamic Simulations of Aircraft Interior Components
S. Heimbs, P. Middendorf - EADS
M. Maier - Institute for Composite Materials (IVW)
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An approach for modeling sandwich structures with a Nomex® honeycomb core and phenolic composite faces in the
commercial finite element code LS-DYNA with solid elements for the core and shell elements for the thin faces is
presented, which accounts for the major sandwich failure modes. Extensive material testing was conducted to
determine the parameters for the composite face material model and for the orthotropic honeycomb material ...
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Process Automation for LS-DYNA Based Shock and Impact Studies (Drop Testing) in eta/VPG Environment
H.M. Yang, Raymon Ju - Flotrend Corporation, Taiwan
H. Ouyang, T. Palmer - Engineering Technology Associates, Inc., USA
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Consumer products are many times used under extreme use conditions which have the potential to damage a device
in a manner such that the internal components become damaged, and non-functioning.
Designing engineers must consider these shock, impact and vibration conditions when designing products, as well
as the shipping containers or packaging of the product for transport to the end user. In addition, there are many
different variations of ...
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Material Model Development for Impact Strength Validation of a Composite Truck Bed Design
Emily Nutwell, Dylan Thomas - Honda R&D Americas
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A recently developed pick-up truck has a unique bed structure which includes an under bed storage system. This
truck bed and storage system design is made of sheet molded composite (SMC) material. SMC is a composite
material where chopped glass fiber is laid on a poly(vinyl)ester sheet and run through a compaction process. SMC
sheets are then loaded into a press to mold the desired part. During the molding process, certain design ...
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Development of Aluminum Honeycomb Model Using Shell Elements
Shigeki Kojima - Toyota Technical Development Corporation, Japan
Tsuyoshi Yasuki - Toyota Motor Corporation, Japan
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This paper describes a new finite element modeling method of aluminum honeycomb using shell elements. It is our
new modeling method that cell size of honeycomb structure is enlarged to keep minimum mesh size, and compressive
strength is controlled by thickness of shell elements.
New modeling was applied to an offset deformable barrier model, and full vehicle crash analysis was performed.
The result of offset frontal collision analysis with a ...
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Mixed Mode Constitutive Driver
Yvonne D. Murray, Carolyn M. Yeager - Aptek, Inc.
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The mixed-mode constitutive driver is a software package that is dedicated to the efficient development, evaluation,
and parameter identification (fitting) of material models used in finite element codes. The core driver calculates the
stress-strain behavior of material models driven by combinations of strain increments and stress boundary
conditions. Graphical user interfaces facilitate selection of the material model constants and desired ...
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LS-DYNA® Performance on 64-Bit Intel® Xeon® Processor-Based Clusters
Tim Prince, Hisaki Ohara, Nick Meng - Intel Software and Solutions Group
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Benchmark performance of a cluster based on the newly introduced 64-Bit Intel® Xeon® Procesessor-based
clusters is presented. Car2car and 3cars benchmarks from topcrunch.org are evaluated, using OpenIB based
interconnects. Effect of shared memory options under Intel® MPI is evaluated. Improvement from optimizing 3cars
P-file decomposition is demonstrated. Intel® Cluster Tools profiler is discussed.
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BioRID II Dummy Model Development -- Influence of Parameters in Validation and Consumer Tests
S. Stahlschmidt, B. Keding, U. Franz - DYNAmore GmbH, Germany
A. Hirth - DaimlerChrysler AG, Germany
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Whiplash injuries frequently occur in low speed rear crashes. Many consumer and insurance organizations use the
BioRID II dummy, to assess the risk of whiplash injuries in car accidents. An LS-DYNA model of the BioRID II
dummy has been developed by DYNAmore GmbH in cooperation with the German Automotive Industry. In the
consortium a huge effort has been made to build a test database for the development of the FE-dummy. This paper
describes ...
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Advances in the Measurement and Modeling of Plastics for Impact Simulations
Hubert Lobo - DatapointLabs
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High strain-rate properties have many applications in the simulation of automotive crash and product drop testing.
These properties are difficult to measure. Previously, we described a novel inferential technique for the
measurement of the properties of polycarbonate. In this paper, we demonstrate that the technique appears to work
for a variety of polymers. We also show that plastics exhibit different kinds of high-strain rate behaviors. It ...
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Three Point Bending Analysis of a Mobile Phone Using LS-DYNA Explicit Integration Method
Feixia Pan, Jiansen Zhu, Antti O. Helminen, Ramin Vatanparast - NOKIA Inc.
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In this article, the 3 point bending analysis of a mobile phone using LS-DYNA explicit integration method is
discussed. Since there are a large number of contact pairs defined in the FEA model, and the FEA model is very
large in a 3 point bending analysis of a phone, it is much more convenient to use the explicit method than the
implicit method. However, using explicit procedure to a quasi-static analysis requires some special ...
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Springback Simulation of the Numisheet 2005 Benchmark II Using DP600
Tim Lim, Tim Dietrich - Dofasco Inc, Canada
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This study uses a design of experiments (DOE) methodology to investigate the sensitivity of springback
prediction to various numerical parameter for the Numisheet 2005 cross member (Benchmark II). The parameters
investigated are; through thickness integration points (21 Gaussian integration points through the thickness vs. 7),
using a static implicit finish in the forming simulation, element size (number of adaptive levels), and ...
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Evaluation of the Impact Condition for a High Capacity Spent Nuclear Fuel System
Mike Yaksh, S. Alan Lin - NAC International Inc.
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Evaluations are performed for the structural component of a fuel basket in a sealed container which is used for
maintaining the configuration of spent nuclear fuel during storage. Spent fuel assemblies are placed into a basket
structure which is comprised of separate tubes whose positions are maintained by a series of pins and sockets and
an exterior frame work of stiffeners. The canister is placed in a vertical storage cask. The controlling ...
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The Application of a New Material Porosity Algorithm for Parachute Analysis
Benjamin Tutt - Irvin Aerospace Inc.
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This paper documents the simulation of parachute performance and the role of LS-DYNA in the design of
parachutes at Irvin Aerospace Inc. It has long been known that fabric permeability is an important weapon in the
arsenal of a parachute designer. In the careful balance of payload rate of descent and parachute stability, the
permeability of the parachute material often plays a vital role. The substitution of an impervious material with ...
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Analysis of Extended End-Plate Connections Under Cyclic Loading Using the LS-DYNA Implicit Solver
Ashish Bhargava, W.M. Kim Roddis, Dhafer Marzougui, Pradeep K. Mohan - The George Washington University
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Moment-Resisting Frames (MRF’s) are widely used as lateral-force resisting systems in buildings. Their successful
performance depends on the behavior of their moment-resisting beam-column connections. In regions at risk for
earthquakes, MRF’s need to resist large cyclic forces and displacements. A variety of beam-column connections are
used in practice. Most, including end plate connections, are designed assuming the MRF seismic capacity is ...
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Perforation of Metal Plates: Laboratory Experiments and Numerical Simulations
Leonard E. Schwer - Schwer Engineering and Consulting Services
Kurt Hacker, Kenneth Poe - Naval Explosive Ordnance Disposal Technology Division
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The Naval Explosive Ordnance Disposal Technology Division has a requirement to establish a modeling capability
to simulate render safe procedures for unexploded ordnance. To aid in establishing this capability, the Navy has
initiated a research and development program that includes modeling studies, research on applicable impact related
material parameters, and comparison of the modeling results with experimental results. This paper presents ...
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Thermal-Structure Coupling Simulation Analysis on Rolling Process of H-shape Steel
Zhiyuan Shi - ShouGang Steel Group
Guoming Zhu - University of Science and Technology Beijing
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Today CAE technology is seeing its rapid development and got widely application in nearly all industries. For
metallurgy CAE is also becoming the highlight in many specialties and playing important roles in process
optimization and property prediction for R&D of new product development. In this paper a typical example, i.e.
thermal-structure coupling simulation analysis on rolling process of H-shape steel with LS-DYNA is introduced.
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Nonlinear Crash Dynamics Simulation of Novel Airbag Based Next Generation Energy Absorbing Barrier
Dr. Rahul Gupta, Dr. Ajit D. Kelkar - North Carolina A & T State University
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The fatality analysis report system of the National Highway Traffic Safety Administration reported that
approximately 42,000 people in the United States are killed annually in motor vehicle crashes. Approximately 30
percent of the fatalities are from run-off-the-road crashes involved in collisions with roadside objects. Energy
absorbing barriers (EABs) such as concrete median barriers, guardrails, guardrail end treatments, ...
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LS-DYNA® Performance and Scalability On Sun(TM) x64 Systems
Michael A. Burke, Youn-Seo Roh, Henry H. Fong - Sun Microsystems, Inc.
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This paper describes AMD Opteron -based x64 systems of Sun Microsystems(TM), primarily the server (TM)
family. Performance and scalability are shown for the refined Neon standard LS-DYNA benchmark problem – for
both gigabit Ethernet and Cisco/Topspin(TM) InfiniBand(TM/SM) interconnects. The Sun Fire(TM) X2100 server, which
can be easily installed in a Sun Grid Rack System, is seen to be a very attractive solution based on ...
