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9th International LS-DYNA Conference

Introduction of an Electromagnetism Module in LS-DYNA for Coupled Mechanical-Thermal-Electromagnetic Simulations
Pierre L’Eplattenier, Grant Cook, Cleve Ashcraft, Mike Burger, Art Shapiro - Livermore Software Technology Corporation
Glenn Daehn, Mala Seth - The Ohio State University
A new electromagnetism module is being developed in LD-DYNA for coupled mechanical/thermal/electromagnetic simulations. One of the main applications of this module is Electromagnetic Metal Forming. The physics, numerical methods and capabilities of this new module are briefly presented. This module is then illustrated on different simulations. A first set of simulations corresponds to a ring expansion experiment, which was performed at ...
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
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 ...
Issues on Gas-Fabric Interaction in Airbag Simulation Using LS-DYNA ALE
Ning Zhang, Linhuo Shi - Toyoda Gosei North Amercia
Bruce Tzeng - Dynamax, Inc.
Computer Aided Engineering (CAE) has been deployed to help developing effective occupant restraint systems, such as airbags, in automotive industries for decades. Until recently, control volume method, which assumes a uniform pressure and density inside airbag, is still widely adapted in most airbag applications. Control volume method allows use of simple thermodynamic equations to efficiently model airbag. Using control volume method to ...
LS-DYNA Features for Hot Stamping
Arthur B. Shapiro - LSTC
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 ...
LS-DYNA Simulation of in vivo Surgical Robot Mobility
Mark Rentschler, John D. Reid - University of Nebraska
In vivo surgical robot wheels were studied to develop a better wheel design using finite element analysis. A liver material model, derived from component testing, was implemented as a viscoelastic material. LS-DYNA simulation of this testing confirmed the accuracy of the liver material model. This material model was then used as the tissue model to study wheel performance. A helical wheel moving on the liver model was used to ...
LS-DYNA® Performance and Scalability On Sun(TM) x64 Systems
Michael A. Burke, Youn-Seo Roh, Henry H. Fong - Sun Microsystems, Inc.
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 ...
LS-DYNA® Performance on 64-Bit Intel® Xeon® Processor-Based Clusters
Tim Prince, Hisaki Ohara, Nick Meng - Intel Software and Solutions Group
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.
Material Model Development for Impact Strength Validation of a Composite Truck Bed Design
Emily Nutwell, Dylan Thomas - Honda R&D Americas
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 ...
Mixed Mode Constitutive Driver
Yvonne D. Murray, Carolyn M. Yeager - Aptek, Inc.
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 ...
Modal Properties of Turbo-Compressor Elements
V. Ignatkov, S. Klambozki, S. Medvedev, M. Petrushina - UIIP NAS of Belarus
In this paper some modal and vibration properties of turbocompressor elements are studied. Natural frequencies of turbokompressor rotor shaft with turbine and compressor wheels and bearing unit elements are calculated. Their spectrum dependence on the material properties of the elements and on the constructive variants of the bearing unit components are studied. Shape modes of the system are obtained . The vibrations of the system at the ...
Modeling Methodologies for Assessment of Aircraft Impact Damage to the World Trade Center Towers
S.W. Kirkpatrick, R.T. Bocchieri, R.A. MacNeill, B.D. Peterson - Applied Research Associates, Inc., USA
Fahim Sadek - National Institute of Standards and Technology, USA
The Federal Building and Fire Safety Investigation of the World Trade Center Disaster was recently completed by the National Institute of Standards and Technology (NIST). A critical component of the investigation was to analyze the aircraft impacts into the World Trade Center (WTC) towers to evaluate the impact-induced damage to the towers. This impact damage established initial conditions for the fire dynamics modeling, ...
MPP in Stamping Simulations with LS-DYNA
Kaiping Li, Yang Hu - DaimlerChrysler Corporation
With the continuous improvement of MPI protocols, for example, Lam-MPI, MPICH, etc.., even fast computer hardware and network connections, the applications of MPP technologies in multi-stage stamping simulations for auto industries becomes more and more attractive, not only because of their scalability, but also for their ability to re-use the older equipments without sacrifice the speed of simulations. In this paper, we will present our ...
New Features in LS-OPT® Version 3
Nielen Stander, Willem Roux - Livermore Software Technology Corporation
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®.
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
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, ...
Numerical Modeling of Friction Effects on the Ballistic Impact Response of Single-Ply Tri-Axial Braided Fabric
Daihua Zheng, Wieslaw K. Binienda, Jingyun Cheng, Marcin Staniszewski - The University of Akron
It has been shown by experiments that frictional effects play an important role in the energy absorption of fabrics subjected to ballistic impact. However, the specific role of friction is not well understood and established. In this paper, a detailed finite element model was developed, using LS-DYNA®, to parametrically study the frictional effects during the ballistic impact of a square patch of single-ply 2D tri-axially braided fabric. The ...
Numerical Simulations of Dynamic Deformation of Air Transport Package PАТ-2 in Accidental Impacts
Alexander A. Ryabov, Vladimir I. Romanov, Sergey S. Kukanov, Sergey G. Skurikhin - Joint Stock Company SarovLabs, Russia
The PAT-2 package is designed by Sandia National Laboratories [1] for the safe transportation of plutonium and/or uranium in small quantities, especially as transported by air. The package consists of an outer container and an inner absorber. The outer container is made of 304 stainless-steel sheet metal. The inner absorber assembly consists of redwood and maplewood layers and is used for decreasing the mechanical loads onto the inner ...
On the Quasi-Static Perforation Resistance of Circular AA5083-H116 Aluminium Plates
F. Grytten, T. Børvik, O.S. Hopperstad, M. Langseth - Norwegian University of Science and Technology
This paper presents numerical simulations of quasi-static perforation of circular AA5083-H116 aluminium plates. The perforation process was analysed with 2D-axisymmetric elements, brick elements and shell elements. Slightly modified versions of the Johnson-Cook constitutive relation and fracture criterion were used in the finite element simulations to model the material behaviour. A factorial design was used to investigate the influence of ...
Optimization of an Adaptive Restraint System Using LS-OPT and Visual Exploration of the Design Space Using D-SPEX
Marko Thiele, Heiner Mullerschön - DYNAmore GmbH
Marcel van den Hove and Bernd Mlekusch - AUDI AG
The purpose of this paper is to explore some interesting aspects of optimization for crashworthiness occupant safety applications and to propose optimization strategies for highly nonlinear problems. With the today’s state of technology i t is possible to identify specific load cases and different types of occupants i n the car. System parameters of the restraint system, such as trigger time for seat- belt, airbag and steering column can be ...
Pedestrian Hood Generation & Optimization Using Knowledge-Based Engineering
Bill McLundie - Jaguar and Land Rover
Mike Twelves - Corus Automotive UK
Mike Howe - Jaguar Land Rover IT.
Knowledge-based Engineering (KBE) has been used in industry in for some time. Companies such as Jaguar initially used KBE to automate well-understood, but repetitive, man-intensive engineering issues at the early phases of a programme. These were / are mainly based around geometrical problems (e.g. ergonomic design). Airbus (UK) in particular over the last few years has taken this to a new level by using ICAD as a method of not only ...
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
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 ...
Porous Euler-Lagrange Coupling: Application to Parachute Dynamics
Jason Wang, Nicolas Aquelet, Ian Do, Hao Chen - Livermore Software Technology Corporation
Benjamin Tutt - Irvin Aerospace Inc.
Mhamed Souli - Laboratoire de Mécanique de Lille
A newly developed approach for tridimensional fluid-structure interaction with a deformable thin porous media is presented under the framework of the LS-DYNA® software. The method presented couples a Arbitrary Lagrange Euler formulation for the fluid dynamics and a updated Lagrangian finite element formulation for the thin porous medium dynamics. The interaction between the fluid and porous medium are handled by a Euler-Lagrange ...
Prediction of Impact Marks for a Stamped Panel with LS-DYNA
Fen Ren, Yinong Shen, Z Cedric Xia - Ford Motor Company
David J. Wynn, Philip Ho - Livermore Software Technology Corporation
Impact marks are the visible damage to the metal surface left by stamping tools sliding across a formed panel. The severity of such impact marks is an important quality measure in part buyoff, particularly for class A panels such as doors, body sides, hoods and deck lids. This paper presents a predictive simulation tool which has been developed to characterize and quantify the impact marks. It is based on the concept of accumulative ...
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
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 ...
Process Modeling of Piercing Micro-hole with High Pressure Water Beam
Jiang Hua, Xiaomin Cheng, Rajiv Shivpuri - The Ohio State University
During the fabrication of very small or fine hole, usually referred to as micro-hole, technical difficulties often arise due to limitation on the precision capability of tooling systems including those associated with alignment. The present project attempts to develop a new process for piercing micro-hole, using high pressure water beam. In this paper, a numerical model for the micro-hole manufacturing is developed which provides helpful ...
Productive Environment for Quick CAE Modeling and Simulation – Visual Environment
Shivakumara H Shetty, Velayudham Ganesan, Nagesh B L, Jean Louis Duval - ESI Group
The current trend of Product Development Cycle needs to be optimized to meet the growing demand for robustness, quality and fast to market. High competition, mandatory regulations and global norms are forcing the engineers and researchers to evolve with innovative ideas and solutions to meet demands. CAE plays a crucial role in the product development cycle where the FE modelling and simulations are preformed for virtual evaluation of the ...
Projecting Performance of LS-DYNA Implicit for Large Multiprocessor Systems
Pramod Rustagi, Ilya Sharapov - Sun Microsystems, Inc.
We use a benchmark dataset of a jet-engine impeller to study the performance characteristics of the LS-DYNA Implicit solver, as a function model size and the number of processors available in the system. We analyze a range of models with an increasing number of fans in the jet-engine impeller, from the smallest model of three fans composed of 300,000 nodes to the largest model of ten fans with 1 Million nodes. The resulting stiffness ...
Scatter Analysis of Crash Simulation Results Enabled by Data Compression
Clemens-August Thole, Rodrigo Iza-Teran, Rudolph Lorentz, Helmut Schwamborn - Fraunhofer Institute for Algorithms and Scientific Computing
In crash simulation, small changes of the model or boundary conditions may result in substantial changes of the simulation results. For the Neon test case [3], small variations of the barrier position result in substantial scatter of the intrusion. Detailed investigations of several models have shown that in some cases numerical effects might be responsible for the scatter in the results. In most cases, however, the instable behaviour of the ...
Simulation of Progressive Damage Development in Braided Composite Tubes Undergoing Dynamic Axial Crushing
Carla McGregor, Reza Vaziri, Anoush Poursartip - The University of British Columbia, Canada
Xinran Xiao, Nancy Johnson - General Motors Corporation
Composite tubular structures are of interest as viable energy absorbing components in vehicular front rail structures to improve crashworthiness. Desirable tools in designing such structures are models capable of simulating damage growth in composite materials. CODAM (COmposite DAMage), which is incorporated into LS- DYNA as a user material model, is a continuum damage mechanics based model for composite materials with physically based input ...
Simulations of Axially Loaded Straight Aluminium Profiles with Random Geometric Imperfections
Ø. Fyllingen, O.S. Hopperstad, M. Langseth - Norwegian University of Science and Technology
Stochastic simulations of square aluminium tubes of 6060 T6 aluminium alloy subjected to axial crushing have been performed in LS-DYNA and compared to existing experiments. The main variables of the experimental study were the extrusion length, the wall thickness and the impact velocity. Three different buckling modes were observed; progressive buckling, a transition from progressive to global buckling and global buckling. In the ...
Springback Simulation of the Numisheet 2005 Benchmark II Using DP600
Tim Lim, Tim Dietrich - Dofasco Inc, Canada
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 ...
Structural Design and Analysis of Hit-To-Kill Projectile
Michael M. Chen - U.S. Army Research Laboratory
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 ...
Systems Engineering Approach in Development of Delphi Driver Protection Module (DDPM) by Virtual Engineering
Mohamed Sahul Hamid, Minoo J. Shah, Jason R. Ridgway, Richard K. Riefe - Delphi Corporation, Troy, MI
In this paper, the design and development of the Delphi Driver Protection Module (DDPM) using a systems and virtual engineering approach is presented. LS-DYNA software tool was used in virtual prototype studies. The DDPM consists of driver side energy absorbing components. The components included in this module are 1) an adaptive Energy Absorbing (EA) steering column, 2) driver air bag, 3) steering wheel, 4) energy absorbing knee bolster, ...
Test and Analysis Correlation of High Speed Impacts of Ice Cylinders
Edwin L. Fasanella, Richard L. Boitnott - US Army Research Laboratory, VTD
Sotiris Kellas - General Dynamics
During the space shuttle return-to-flight preparations following the Columbia accident, finite element models were needed that could predict the threshold of critical damage to the orbiter’s wing leading edge from ice debris impacts. Hence, an experimental program was initiated to provide crushing data from impacted ice for use in dynamic finite element material models. A high-speed drop tower was configured to capture force time-histories ...
The Advantages of HP-MPI for MPP LS-DYNA
Yih-Yih Lin - Hewlett-Packard Company
The standard portable message-passing library MPI is the software tool that drives the parallelism in MPP LS- DYNA. MPI is required to operate in a complex environment: Currently, the major computer architectures include X86, X86_64, and Intel Itanium 2; the major operating systems include Linux, Window, and UNIX; diverse interconnects and switches, using different protocols, are offered by various vendors; and furthermore, in recent years ...
The Application of a New Material Porosity Algorithm for Parachute Analysis
Benjamin Tutt - Irvin Aerospace Inc.
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 ...
The Evolution of Sheet Metal Forming Simulation in Stamping Industry
Arthur Tang, Wing Lee , Jeanne He - Engineering Technology Associates, Inc., Michigan
C. C. Chen - Dyna Forming Engineering & Technology Sdn. Bhd., Malaysia
The field of sheet metal forming has experienced numerous innovative changes over the past few decades, such as new forming techniques and application of computer technologies. New forming techniques include application of tailor-welded blank, high strength steel forming, hydroforming, press automation and so on. One of the computer technologies is the implementation of Computer Aided Engineering (CAE), such as sheet metal forming ...
The New CE/SE Fluid Solver and Fluid/Structure Coupling
Zeng-Chan Zhang, Grant O. Cook, Jr. - Livermore Software Technology Corporation
In this paper, we will discuss a new compressible fluid solver (it will be included with the release of LS980) and its fluid/structure coupling strategy. This fluid solver is based upon the Space-Time Conservation Element and Solution Element Method (or the CE/SE method for short), while a quasi-constraint method is used in the fluid/structure couplings.
The Performance of Large Car Model by MPP Version of LS-DYNA on Fujitsu PrimePower
Mitsuhiro Makino - Fujitsu Limited
In order to get the accurate results, the car models become large and the computational time becomes long. I developed 1.2million elements car models based on NCAC Caravan model, for studying the performance of large number of elements models and large number of CPUs on MPP version of LS-DYNA. 1., The selection of parts of surface to surface contact is sensitive for the large number of CPUs. 2. Soft=2 contact is good performance compared ...
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
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.
Thermomechanical Analysis of the Turbo-Compressor Sliding Bearing Mount Units
M. Petrushina, S. Klambozki, O. Tchij - UIIP NAS of Belarus
On SKIF k-1000 supercomputer the temperature fields in turbo-compressor sliding bearings were defined. Dynamic temperature loads were estimated by calculating of heat conduction in the rotor shaft from 600 C heated turbine to the compressor wheel. Conduction and radiation losses were taken into account. The role of friction in heating the contacting parts of the bearing mount assembly was estimated. The calculation of heat conduction through ...
Thin-Walled Beams Research and Development
Moisey B. Shkolnikov
An integrated warped FEM beam element has been implemented in LS-DYNA and is considered here as a very important beginning. Accounting for warping is a fundamental part of Thin-walled beam theory, having more than three quarters of century history of research and developments, which are still active. Information related to thin- walled beams looks to be very useful to LS-DYNA users, may define steps for further beam FEM ...
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.
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 ...
Using Platform LSF To Harness Non-Dedicated Computational Resources for LS-DYNA Crash Simulations at DaimlerChrysler
Dale Dunlap, Joseph Cieslak P.E. - Platform Computing
John Picklo - DaimlerChrysler Corporation
Computer aided engineering (CAE) tools are an important part of the product development lifecycle. These tools are used to perform complex simulation and analyses during the design phase. CAE requires significant computational resources in order to meet the response time requirements of the design engineers that use these applications. The speed and volume of CAE work provides a competitive advantage to the manufacturer by helping to bring ...
Validating Performance of Automotive Materials at High Strain Rate for Improved Crash Design
K.C. Wood, C. A. Schley, S. Kenny - University of Warwick, IARC
T. Dutton - Dutton Simulation
M. Bloomfield - Land Rover
R. Bardenheier - Inston Ltd
J. R. D. Smith - ARRK Technical Services
This paper investigates sources of performance variability in high velocity testing of automotive crash structures. Sources of variability, or so called noise factors, present in a testing environment, arise from uncertainty in structural properties, joints, boundary conditions and measurement system. A box structure, which is representative of a crash component, is designed and fabricated from a high strength Dual Phase sheet steel. Crush ...
Verification of a New Fracture Criterion Using LS-DYNA
Liang Xue, Tomasz Wierzbicki - Massachusetts Institute of Technology
Several fracture models are available in the material library of LS-DYNA. This paper is concerned with a newly developed constitutive model that covers the full range of plasticity till the onset of fracture. It is understood that the fracture initiation in uncracked solids is an ultimate result of a complex damage accumulation process. Such damage is induced by plastic deformations. A new damage model is proposed to incorporate the ...