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9th International LS-DYNA Conference

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.
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, ...
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 ...
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 ...
A Mesh Refinement Study on the Impact Response of a Shuttle Leading-Edge Panel Finite Element Simulation
Karen E. Jackson, Edwin L. Fasanella - US Army Research Laboratory, VTD
Karen H. Lyle - NASA Langley Research Center
Regina L. Spellman - NASA Kennedy Space Center
A study was performed to examine the influence of varying mesh density on an LS-DYNA simulation of a rectangular-shaped foam projectile impacting the space shuttle leading edge Panel 6. The shuttle leading-edge panels are fabricated of reinforced carbon-carbon (RCC) material. Nine cases were executed with all possible combinations of coarse, baseline, and fine meshes of the foam and panel. For each simulation, the same material properties ...
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 ...
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 ...
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 ...
Fluid Structure Interaction in LS-DYNA Using Lagrangian Interfaces, Automatic Re-meshing and Adaptivity
Facundo Del Pin, Grant O. Cook, Jr. - Livermore Software Technology Corporation
The present work discusses a new Fluid Mechanics approach that will be introduced in future versions of LS-DYNA to solve incompressible flows. The objective of this new formulation will be to solve fluid-structure interaction problems using Lagrangian interfaces. In this way large deformations of structures are treated in a more natural fashion making it simpler to define the physical domain. Furthermore the proposed approximation will also ...
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 ...
Front Bumper Crashworthiness Optimization
Shokri El Houssini - Daan Engineering s.n.c
During a vehicles frontal crash, passengers jeopardize high acceleration and energy opposite to the mass follow direction of their bodies. This fact causes high injury to the passengers’ whole body; head, neck, chest, and legs. We started thinking of reducing this deceleration effect on passengers during the crash. This is because succeeding in reducing mass deceleration effect on the passengers’ bodies will lead to save passengers form ...
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 ...
Application of Dynamic Relaxation in Thermo-Elastic Structural Analysis of Highway Pavement Structures
Samir N. Shoukry, Gergis W. William, Mourad Riad - West Virginia University
This paper describes the application of the dynamic relaxation technique implemented in LS-DYNA in analyzing large transportation structures as dowel jointed concrete pavements under the effect of temperature variations. The main feature of the pavement model is the detailed modeling of dowel bars and their interfaces with the surrounding concrete using extremely fine mesh of solid elements, while in the bridge structure, it is the detailed ...
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 ...
An Efficient Shell Element Based Approach to Modeling the Impact Response of Fabrics
Ali Shahkarami, Reza Vaziri - The University of British Columbia, Canada
An efficient shell element based computational model is developed to capture the mechanical response of fabrics. The approach considers a single yarn crossover as the basic building block (unit-cell) of the fabric panel and uses a specially formulated shell element within LS-DYNA to capture the essential features of the membrane response of this unit-cell accounting for both geometrical and material characteristics of the yarns. The shell ...
Demand Driven Side Impact Restraint System Development Method
Gary Owen - Autoliv
This paper describes a demand driven product development method that applies a synergetic combination of numerical simulation and physical test techniques to guide the development of side impact restraint systems and associated simulation procedures and physical test devices.
An Assessment of the Robustness of the European Pedestrian Leg Impact Test Using LS-OPT and LS-DYNA
Tim Keer - Arup
The automotive safety community is currently facing the challenge of new pedestrian impact requirements, introduced in Europe in 2005. These requirements necessitate considerable changes to the vehicle front end (bumper system, hood and fenders). LS-DYNA models of the pedestrian impactors (head, upper leg and leg) are an important tool for analysis of the various tests that comprise the new requirements. One of the criticisms of the current ...
Development and Validation of a Headform Impactor Finite Element Model with Application to Vehicle Hood Design for Pedestrian Protection
Costin Untaroiu, Jaeho Shin, Jeff Crandall, Scott Crino - University of Virginia
Head injuries are the most common cause of pedestrian deaths in car-to-pedestrian collisions. To reduce the severity of such injuries, international safety committees have proposed subsystem tests in which headform impactors are impacted upon the car hood. In the first part of the paper, the development and validation of an adult headform impactor finite element (FE) model is presented. The skin material model was assumed as viscoelastic and ...
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 ...
Bird Strike Simulation for BA609 Spinner and Rotor Controls
Cheng-Ho Tho, Michael R. Smith - Bell Helicopter Textron Inc.
Bird strike incidents are not uncommon and cost the U.S. civil aviation industry approximately $495 millions and 631,341 hours of downtime annually [1]. The development test to meet the bird strike certification requirements is very costly and time-consuming. This paper presents the bird strike analysis using the Arbitrary Lagrangian- Eulerian (ALE) technique in LS-DYNA for the BA609 spinner and rotor controls assembly shown in Figure 1. ...
Finite Element Modeling of Strip Curvature During Hot Rolling
Anup A. Kuldiwar
Finite element techniques have been used to decouple some of the major causes of strip curvature in the finishing stages of a hot strip mill. A plane strain elastic-plastic finite element model (HYPERMESH5.0) is used to predict the direction and severity of strip curvature caused by asymmetrical factors at each pass of the finishing mill. Predictions have been obtained using the elastic-plastic facilities of LS-DYNA Version 960. A full ...
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 ...
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 ...
A Numerical Investigation into the Injury Potential of Three-year-old Children Seated in Forward Facing Child Safety Seats During Side Impact Crashes in Far Side Configurations
Qian Wang, Tanya Kapoor, William Altenhof - University of Windsor
Andrew Howard - The Hospital for Sick Children
This research focuses on the injury potential of children seated in forward facing child restraint seats during side impact crashes. Side dynamic sled tests were conducted by NHTSA using the existing FMVSS 213 seat fixture oriented at both 90° and 45° relative to the motion of the sled buck. A half sine pulse and a scaled FMVSS 213 pulse were used in the tests. All the tests were conducted at a test velocity of 32 km/h (20 mph) and a peak ...
A Numerical Model for Tri-Axially Braided Composites Under High Velocity Soft Projectile Impact
Jingyun Cheng, Wieslaw K. Binienda - The University of Akron, Akron OH
A simplified methodology has been developed for modeling 2D tri-axially braided composite plates impacted by a soft projectile using an explicit nonlinear finite element analysis code LS-DYNA. Fiber preform architecture is modeled using shell elements by incorporating the fiber preform architecture at the level of integration points. The soft projectile was modeled by an Equation of State (EOS). An arbitrary Lagrangian-Eulerian (ALE) ...
CAE Correlation with Test for Door Slam in Nonlinear Dynamic Stress and Fatigue Life Analysis
Guangtian Gavin Song, Rana Sanghera, Surya Yerva, Hamid Keshtkar - DaimlerChrysler Corporation
In automotive industry, CAE fatigue life analysis is very important in durability evaluation and product optimization to dramatically reduce the design period and minimize the expensive durability testing. In the past time, CAE fatigue life analysis is constrained to the linear stress based methodology in the local strain approach. Generally, the linear stress based methodology is stress analysis with linear material properties. Contact ...
Development, Optimization, and Design for Robustness of a Novel FMVSS 201U Energy Absorber
David M. Fox - US Army Tank Automotive Research, Warren, MI
In order to streamline the product development process, the design space for FMVSS 201U impact performance of a steel mechanical energy absorber assembly was investigated by means of LS-DYNA 970 explicit finite element simulation methods in conjunction with statistical analytical procedures. A sequence of response surfaces, based on various levels of design parameters, was developed and used to determine minimal stopping distance for which ...
Finite Element Modeling and Analysis of Crash Safe Composite Lighting Columns, Contact-Impact Problem
Alexey Borovkov, Oleg Klyavin, Alexander Michailov - St.Petersburg State Polytechnical University,
Martti Kemppinen, Mikko Kajatsalo - Mikkeli Polytechnic Research Centre YTI, Finland
Three Finnish associates, Tehomet Ltd, Fibrocom Ltd and Mikkeli Polytechnic Research Center YTI developed an internationally awarded energy absorbing lighting column product family in 2005. The design and dimensioning were assisted with static FEM computations, preliminary impact tests and full-scale impact tests made by YTI. The CompMechLab helped these associates in product optimization and further development by developing lighting column ...
Implementations of User Defined Shell Elements and Material Models to LS-DYNA and Their Application
J.W. Yoon, R.E. Dick - Alcoa Technical Center
Robustness, accuracy and good computational performance for large scale models are some of the salient requirements for general purpose finite element programs. A new one point quadrature shell element that meets these requirements has been previously developed in the works of Cardoso & Yoon (2005). In the theory, the finite element strain-displacement matrices are described in a convective coordinate system for the efficient implementation ...
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, ...
Development of an Energy Absorbing End Terminal for Open Box Beam Guardrail
Nauman M. Sheikh, Roger P. Bligh, D. Lance Bullard, C. Eugene Buth, Dean C. Alberson, Akram Y. Abu-Odeh, Hayes E. Ross Jr. - Texas Transportation Institute
An energy absorbing end terminal was developed for use with the European box beam guardrail system. The European box beam rail sections have an open architecture that is different from what is used in North America. The overall design effort utilized finite element simulation, individual component testing using the bogie and pendulum, and performance validation by full scale vehicle crash testing. The design process involved ...
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 ...
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 ...
Calibration and Experimental Validation of LS-DYNA Composite Material Models by Multi Objective Optimization Techniques
Stefano Magistrali - Omega Srl, Research and Innovation Centre
Marco Perillo - EnginSoft SpA
Experimental quasi-static tensile and impact tests were conducted over two different types of composite laminates and four different types of sandwich laminates, in order to evaluate their basic mechanical characteristics and energy adsorption capability. The second phase of this research work approaches and resolves the calibration of the mechanical parameters included into the LS-DYNA composite material models. This calibration starts and ...
A Coupled Thermal and Mechanical Model of Sliding Wear
S. S. Akarca, W. J. Altenhof, A. T. Alpas - University of Windsor, Canada
Sliding wear of aluminum alloys induce plastic deformation below the contact surfaces even at light loads. Experimental evidence exists for damage accumulation in the form of nucleation of voids and microcracks around the second phase particles in the material layers adjacent to the contact surface. Crack propagation at a certain depth below the surface may lead to the creation of long and thin wear debris particles. The objective of this ...
Application of New Concrete Model to Roadside Safety Barriers
Akram Abu-Odeh - Texas Transportation Institute
The subject of roadside safety has been seeing a healthy growth in the use of nonlinear finite element analysis in designing and analyzing roadside hardware systems. Some factors that helped researchers include the expanded capabilities of LS-DYNA commercial finite element code, the availability of several public domain vehicle models and the availability of material models explicitly built and modified for roadside safety applications. One ...
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 ...
Considerations for LS-DYNA Workflow Efficiencies in an HPC Linux Environment
Stanley Posey - HPC Applications Development
Manufacturing industry and research organizations continue to increase their investments in structural analysis and impact simulations such that the growing number of LS-DYNA users continues to demand more from computer system environments. These LS-DYNA workflow demands typically include rapid single job turnaround and multi- job throughput capability for users with diverse application requirements in a high-performance computing ...
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.
A Brittle Damage Model: Implementation into LS-DYNA and Application to Normal Plate-on-Plate Impact
Martin N. Raftenberg - U.S. Army Research Laboratory
A brittle damage model developed by M. A. Grinfeld was implemented in the LS-DYNA finite element code and applied to the simulation of normal plate-on-plate impact. The model introduces a state variable measure of damage that evolves in proportion to the elastic strain energy. The model degrades the elastic shear modulus in proportion to the state variable’s current level. The implementation procedure by means of the LS-DYNA user- material ...
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 ...
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 ...
Accurate Prediction of Projectile Residual Velocity for Impact on Single and Multi-Layered Steel and Aluminum Plates
M. Raguraman and A. Deb - Indian Institute of Science, Bangalore
The present paper deals with the simulation of impact of jacketed projectiles on thin to moderately thick single and multi-layered metal armor plates using explicit finite element analysis as implemented in LS-DYNA. The evaluation of finite element modeling includes a comprehensive mesh convergence study not previously reported in literature, using both shell and solid elements for representing single-layered mild steel target plates. It is ...
Crashworthiness Simulation Using Coupled Meshfree/Finite Element Formulations in LS-DYNA
Hui-Ping Wang, Ye-Chen Pan, Yi-Pen Cheng - General Motors Corporation
This paper demonstrates applications of a coupled meshfree/finite element solver of LS-DYNA in the analysis of crashworthiness components. Two examples are employed in the study. The first one is a European side impact dummy component test problem. It is used to show the robustness of the coupled meshfree/finite element solver in handling large deformation since the finite element analysis of this problem fails due to numerical instability ...
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 ...
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 ...
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, ...
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®.
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.
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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