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10th International LS-DYNA Conference

Novel HPC Technologies for Scalable CAE: The Case for Parallel I/O and File Systems
Stan Posey - Panasas, Inc., Fremont, CA, USA
As HPC continues its aggressive platform migration from proprietary supercomputers and Unix servers to HPC clusters, expectations grow for clusters to meet the I/O demands of increasing fidelity in CAE modeling and data management in the CAE workflow. Cluster deployments have increased as organizations seek ways to cost- effectively grow compute resources for CAE applications, and during this migration many also implemented conventional ...
The Performance of 10-Million Element Car Model by MPP Version of LS-DYNA® on Fujitsu PRIMEPOWER
Mitsuhiro Makino - Computational Science and Engineering Solution Center, Fujitsu Limited
In automotive industries, car crash analysis by finite element methods is a very important tool for reducing the development time and cost. In order to get the accurate results, in addition to the improvement of the finite element technology, such as full-integrated shell elements, smaller size of finite element mesh is used, because finer meshes represent the car geometry more accurately, and reduce the noise of contact force. The batch mesh ...
Optimizing LS-DYNA® Productivity in Cluster Environments
Gilad Shainer, Swati Kher - Mellanox Technologies
Increasing demand for computing power in scientific and engineering applications has spurred deployment of high- performance computing (HPC) clusters. Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) are computational technologies that can take advantage of HPC clusters for increasing engineering design productivity, reduce development cost and faster time to market. The end-user benefits are far more ...
Intel Cluster Ready Support for LS-DYNA®/MPP
Tim Prince - Intel Corporation
The Intel Cluster Ready program enables LS DYNA/MPP users to buy, install, and use clusters more effectively. It includes a joint Intel and cluster supplier certification process to ensure the cluster the LS-DYNA user purchases is designed and built to specification. Intel supplied software tools support verification of initial and ongoing operation and performance of the cluster.
LS-DYNA Performance Improvements with Multi-Rail MPI on SGI Altix ICE Clusters
Olivier Schreiber, Michael Raymond, Srinivas Kodiyalam - SGI
Multi-Rail networks can improve MPI communication performance by distributing the communication traffic to multiple independent networks (rails). Messages are divided into several chunks and sent out simultaneously using multiple rails. With the dual plane network topology of SGI Altix ICE clusters, MPI communication can hence utilize both the InfiniBand rails, including, ib0 and ib1 fabrics. The performance gains achievable with LS-DYNA ...
Comparison of ALE and SPH Simulations of Vertical Drop Tests of a Composite Fuselage Section into Water
Karen E. Jackson, Yvonne T. Fuchs - NASA Langley Research Center Hampton
Simulation of multi-terrain impact has been identified as an important research area for improved prediction of rotorcraft crashworthiness within the NASA Subsonic Rotary Wing Aeronautics Program on Rotorcraft Crashworthiness. As part of this effort, two vertical drop tests were conducted of a 5-ft-diameter composite fuselage section into water. For the first test, the fuselage section was impacted in a baseline configuration without ...
An Implicit Incompressible CFD Solver in LS-DYNA for Fluid-Structure Interaction Problems
Facundo Del Pin - Livermore Software Technology Corporation
The present work is an introduction to a new CFD solver in LS-DYNA®. This solver is part of the efforts put in LS- DYNA with the objective to expand the capabilities into new challenging problems in industry. The new CFD solver will focus on fluid-structure interaction (FSI) applications where incompressible fluids interact with the existing structures in LS-DYNA. Incompressible flows are present in a great variety of industrial applications ...
2D to 3D ALE Mapping
Nicolas Aquelet - Livermore Software Technology Corporation
Mhamed Souli - Laboratoire de Mecanique de Lille
A 2D MMALE (Multi-Material Arbitrary Lagrange Euler) code was implemented in LS-DYNA®. Like the 3D MMALE already available each 2D computational cycle is divided in two steps. First a multi-material version of the two-dimensional shell formulations solves the physical problem on quadrangle meshes during the Lagrangian step. The 2D shell formulations are plane strain and area-weighted axisymmetric. An advection step adapted to the 2D shell ...
Using the New Compressible Fluid Solver in LS-DYNA CESE Solver and the Input File Setup
Zeng-Chan Zhang - Livermore Software Technology Corporation
In this new compressible fluid solver, the conservation element and solution element (CESE) method[1, 2] is used. The CESE method is a novel numerical method for solving conservation laws and it has many nontraditional features, such as: • Space and time conservation ⎯ Flux conservation can be maintained very well both locally and globally in space & time. • Accurate ⎯ It is 2nd order for both flow variables and their ...
Simulation of Ballistic Impact on Composite Panels
Matti Loikkanen - Propulsion Engineering Technology & Research
Grama Praveen - Global Research Center, General Electric Company
David Powell - University of California, Berkeley
Ballistic impact on composite panels is studied in this work both experimentally and computationally. The purpose was to develop computational methods to analyze a high speed jet engine fragment impacting on composite targets. 12 inch by 12 inch laminated panels with 8, 16, and 32 plies and the standard +-45, 0 /90 degree stacking sequences were considered. With the nominal ply thickness of 0.0075 inches, the corresponding panel thicknesses ...
LS-DYNA® Impact Simulation of Composite Sandwich Structures with Balsa Wood Core
L. J. Deka, U. K. Vaidya - The University of Alabama at Birmingham
The impact damage response of balsa core sandwich composite plates with S2-glass/ epoxy reinforced facesheets is evaluated by impacting them with a spherical steel projectile at single impact locations. The impact damage can significantly reduce the structural integrity and load bearing capacity of a composite structure. Under high velocity impact loading, laminated composites experience significant damage causing fiber breakage, matrix ...
The Use of LS-DYNA® Models to Predict Containment of Disk Burst Fragments
Eric Stamper, Steven Hale - CAE Associates Inc.
Turbomachinery manufacturers commonly test the centrifugal strength of their rotors in a vertical axis spin test, often called a disk burst test. The design of the containment shell that encloses the disk burst event is critical to ensure the safety of the area surrounding the test. A common method used to design the containment shell for a turbine disk burst test is based on the assumption that the kinetic energy lost by the disk fragments ...
Simulation of Progressive Deformable Barrier (PDB) Tests
Chung-Kyu Park, Seong-Woo Hong, Pradeep Mohan, Richard M. Morgan, Cing-Dao (Steve) Kan - The George Washington University
Kisu Lee, Shinhee Park, Hanil Bae - Hyundai Motor Co. & KIA Motors Corp.
This paper describes the Finite Element (FE) model development of the Progressive Deformable Barrier (PDB). The FE model of the PDB incorporates shear tearing effect and air pressure effect of the honeycomb in the PDB. The developed PDB is used in several vehicle-to-PDB simulations to check its robustness. Five different makes and models of passenger vehicles are selected for the simulation of PDB tests. Finally, the aggressiveness of ...
The Effect of using Rigid ISOFIX on the Injury Potential of Toddlers in Near-side Impact Crashes
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 safety seats during side impact crashes in a near side seated position. Side impact dynamic sled tests were conducted by NHTSA at Transportation Research Center Inc. using a Hybrid III 3-year-old child dummy in convertible forward/rearward child safety seat. The seat was equipped with a LATCH and a top tether and the dummy was positioned ...
Modeling Self-Piercing Riveted Joint Failures in Automotive Crash Structures
P.K.C. Wood, C. A. Schley - University of Warwick, England
M. Buckley - Jaguar and Land Rover, England
B. Walker, Ove - Arup and Partners, England
T. Dutton - Dutton Simulation, England
This paper describes a new model and method to predict Self-Piercing Riveted (SPR) joint interlock failures in aluminium sheet at crash speeds using explicit finite element simulation. SPR interlock failure is dependent on rivet direction, which is included in the model. A mesh independent approach is adopted for connection model which is capable of industrial application at the full vehicle crash analysis level. The paper provides an ...
WorldSID Dummy Model Development in Cooperation with German Automotive Industry
Alexander Gromer, Sebastian Stahlschmidt - DYNAmore GmbH
Peter Schuster - Dr. Ing. h.c. F. Porsche AG
The paper describes methodology used to develop the PDB WorldSID model. The test database generated to build and validate the models is described, as well as the design process of a new barrier shape to validate the model in respect to the new FMVSS 214 oblique pole test. Finally, the performance of the current development release is presented.
New Finite Element Model for NHTSA Impact Barrier
Mehrdad Asadi - Cellbond Composites Ltd., UK
Brian Walker - Arup
Hassan Shirvani - Anglia Ruskin University, UK
The US Federal Standard for Side Impact Protection (FMVSS 214) uses a deformable barrier and defines the dimensions and materials of the barrier, as well as the crush strength of the aluminium honeycomb parts in the main block and the bumper. This deformable barrier is also used for rear impact according to the updated FMVSS 301. This paper represents the methodology to create the advanced Finite Element model of Cellbond’s NHTSA barrier and ...
Ideas on Applying Very Fine Models in Dummy Model Development
Uli Franz, Alexander Gromer, Jens Zschieschack - DYNAmore GmbH
Matthias Walz - Mercedes Car Group, Daimler AG
Yupeng Huang - Sunrise Auto Safety Technology
Very fine models allow investigating the behavior of dummies with high accuracy. Even if ele- ment numbers for a dummy model above 3 Million elements are currently not suitable for stan- dard simulation in vehicle development, the usage of such models contribute to the development of coarser dummy models. Due to the detailed representation physical effects occurring can be captured very realistically with the very fine models. The paper ...
Development of Finite Element Models of Restraint System for Injury Analysis in Side Impact
Satoshi Fukushima, Koushi Kumagai, Tsuyoshi Yasuki - Toyota Motor Corporation
Yoshiharu Sonoda, Yu Setoyama - Toyota Technical Development Corporation
The use of occupant protection simulation by finite element model is increasing for vehicle development. Finite element models of moving deformable barrier honeycomb, vehicle body, dummy, and restraint system have been developed to predict the dummy injury values. To more accurately predict the dummy injury indices in side impact analysis, this paper describes the improvement of finite element models of restraint system such as torso airbag ...
Modeling Rebound of Foam Backed Racetrack Barriers
John D. Reid, Robert W. Bielenberg - University of Nebraska-Lincoln
Modeling energy absorbing foams that restore back to their original shape can be extremely challenging, especially when the foam is crushed over 90%. However, the foam used in the SAFER racetrack barrier does indeed nearly return to its’ original shape after severe crushing. The desire to model this behavior led to the use of the Fu Chang foam model available in LS-DYNA .
Gas Dynamic Simulation of Curtain Airbag Deployment through Interior Trims
Bill Feng, David Coleman - Jaguar Cars and Land Rover
The curtain airbag is usually simulated by a uniform pressure method in which the pressure of the airbag is considered as constant. This is correct when the airbag is fully deployed. However, this assumption is not valid during the curtain airbag deployment phase, where the gas flow passing through each chamber can be clearly seen. Therefore it is impossible to simulate the intermediate sequences of the airbag deployment correctly by using ...
Benchmark Study on the AIRBAG_PARTICLE Method for Out-Of-Position Applications
Wenyu Lian - General Motors
Dilip Bhalsod - Livermore Software Technology Corporation
Lars Olovsson - IMPETUS Afea
The demands for developing safety restraint systems that perform well under Out-Of-Position (OOP) conditions have increased significantly in recent years. At the same time, the development of simulation capabilities for OOP have made progress in most major crash/safety software, such as the coupled Lagrangian-Eulerian approach (here referred to as AIRBAG_ALE) in LS-DYNA® by LSTC. Similar technologies are applied in MSC-Dytran by MSC ...
Pelvic Response Investigation of Lateral Loading Conditions using Finite Element Models
Jaeho Shin, Costin D. Untaroiu, Jeff R. Crandall - University of Virginia Center for Applied Biomechanics
Since the limited space between the car structure and an occupant makes it difficult to manage side impact energy, much biomechanical investigation has been done by subjecting the pelvis to lateral loading. In this study, the dummy finite element model was partially modified to verify the lateral pelvic loading by a rectangular shape impactor and used to explain in detail the previous investigation under iso-energy. In order to better ...
Modeling High Speed Machining with the SPH Method
C. Espinosa, M. Salaun,C. Mabru,R. Chieragatti - Université de Toulouse, France
J.L. Lacome - LSTC, USA
J. Limido IMPETUS Afea, France
The purpose of this work is to evaluate the use of the Smoothed Particle Hydrodynamics (SPH) Method within the framework of modeling high speed cutting. First, a 2D SPH based model is carried out using the LS-DYNA® software. SPH is a meshless method, thus large material distortions that occur in the cutting problem are easily managed and SPH contact control allows a “natural” work piece/chip separation. The developed SPH model proves its ...
A Smoothed-Particle Hydrodynamics (SPH) Model for Machining of 1100 Aluminum
S. S. Akarca, W. J. Altenhof, A.T. Alpas - University of Windsor
The smoothed-particle hydrodynamics (SPH) technique was used to model experimentally observed large deformation behaviour of aluminum (1100 Al) during machining. The effectiveness of the SPH method in predicting the response of the 1100 Al workpiece during orthogonal machining has been assessed through a careful comparison with the experimentally measured stress/strain distribution within the chips formed during steady state cutting. An ...
Preliminary Results for an Isogeometric Shell
David J. Benson - Dept. of Structures, UCSD
Yuri Bazilevs, Thomas J. R. Hughes - ICES, U Texas Austin
Comparison of Hybrid III Rigid Body Dummy Models
Stephen Kang, Paul Xiao - Ford Motor Company
Hybrid III Dummy Computer Aided Engineering (CAE) models have long been used for aspects of vehicle design, including vehicle structure and restraint systems to meet regulatory safety rating targets and internal company requirements. The quality and run time of these CAE models in simulating physical dummies directly affects the usefulness of CAE tools in vehicle development. The objective of this study is to compare the responses of the ...
Mortar Contact Algorithm for Implicit Stamping Analyses in LS-DYNA
Thomas Borrvall - Engineering Research Nordic AB, Sweden
A challenging task for the static implicit nonlinear solver in LS-DYNA is to accurately and robustly solve contact problems, especially is this needed for stamping simulations. This paper aims at investigating the benefits of a mortar segment-to-segment contact algorithm by Puso and Laursen [1,2] when compared to the traditional node-to- segment approach. A penalty based version of the algorithm is implemented in LS-DYNA, meaning that the ...
Sheet Metal Forming Simulation and Real World Tooling
Matt Clarke - Continental Tool and Die
Jeanne He - Forming Simulation Technology LLC
In a modern day draw simulation; our objective has always been to verify the formability of the deformed blank. We then utilize the output of the simulation to ascertain the forces required to form the part. Little time is spent attempting to verify if our design for the die is capable of reproducing these results. Most simulation assumes the tools are rigid. The real expertise comes when you can reproduce that scenario in an actual tool ...
Visions and Latest Developments in Dynaform
Arthur Tang, Jeanne He - Engineering Technology Associates, Inc.
DYNAFORM has been evolved from a Draw Die analysis tool to a Die System analysis tool kits. As the simulation technology and computer resources have been growing rapidly, more demands emerges from different stage of the product and process development sector. Stamping simulation technology is facing more challenges. Based on LS- DYNA ® implicit and explicit solver, DYNAFORM provide simulation tools that support not only the ...
A Study of Quasi-static Problem by SPH Method
Tatsuo Sakakibara, Toru Tsuda, Ryo Ohtagaki - ITOCHU Techno-Solutions Corporation
The SPH method is well known for the hydrodynamics and recently SPH is applied for the impact and the penetration behavior into solid materials. SPH is completely mesh free so that it seems to be appropriate to simulate crash behaviors of concrete and rock materials. However, the applicability and the effects of the parameter of SPH for quasi-static problems are not clear completely. In this paper, in order to verify the applicability and ...
Assessing the Convergence Properties of NSGA-II for Direct Crashworthiness Optimization
Guangye Li - IBM Deep Computing Group, Houston TX
Tushar Goel, Nielen Stander - Livermore Software Technology Corporation
The elitist non-dominated sorting genetic algorithm (NSGA-II) converges to the Pareto optimal front (POF) if a sufficient number of function evaluations are allowed. However, for expensive problems involving crash simulations, only a limited number of simulations might be affordable. It is observed that initially there are significant advances towards the POF but as the population matures, the improvements are relatively small. This means ...
Numerical Simulation and Experimental Study for Magnetic Pulse Welding Process on AA6061-T6 and Cu101 Sheet
Yuan Zhang, Geoff Taber, Anupam Vivek, Glenn Daehn, Pierre L’Eplattenier - Livermore Software Technology Corporation
Suresh Babu - The Ohio State University
Magnetic Pulse Welding (MPW) is a collision welding process, similar to Explosive/impact Welding (EXW), but it utilizes electromagnetic force as the acceleration mechanism. Therefore, the available energy is much lower than EXW and it makes the process safer and more reproducible for sheet seam welding. However, the available energy must be better focused and controlled. In the sheet seam MPW process, a flyer sheet is driven and collides with ...
Metamodel Sensitivity to Sampling Strategies: A Crashworthiness Design Study
Nielen Stander, Tushar Goel - Livermore Software Technology Corporation
A study is conducted to determine the sensitivity of 2 topologically distinct metamodel types to variations in the experimental design brought about by sequential adaptive sampling strategies. The study focuses on examples encountered in crashworthiness design. Three sampling strategies are considered for updating the experimental designs, namely (i) a single stage approach, (ii) a sequential approach and (iii) a sequential approach, but ...
Influence of the Coupling Strategy in the Numerical Simulation of Electromagnetic Sheet Metal Forming
Ibai Ulacia, Iñaki Hurtado - University of Mondragon
José Imbert, Michael J. Worswic - University of Waterloo, Canada
Pierre L’Eplattenier - Livermore Software Technology Corporation, USA
In this paper the Electromagnetic Forming process is numerically analyzed using a novel method that is being implemented into the commercial LS-DYNA® code. The method consists on a combination of a Boundary Element Method (BEM) and a Finite Element Method (FEM) formulations to compute the electromagnetic analysis. The main advantage of using BEM is that the air is not meshed avoiding the related problems and making it easier to couple the ...
Validation of Finite Element Crash Test Dummy Models for the Prediction of Orion Crew Member Injuries during a Simulated Vehicle Landing
Ala (Al) Tabiei - Mason, Ohio
Charles Lawrence - NASA Glenn Research Center, Cleveland, OH
Edwin L. Fasanella - NASA Langley Research Center, Hampton, VA
A series of dummy response during a simulated Crew Exploration Vehicle (CEV) module landing is conducted at the Wright-Patterson Air Force Base (WPAFB). These tests consisted of several crew configurations with, and without astronaut suits. Finite element models of the tests are developed and presented herein. The finite element models are validated using the experimental data. Several outputs from the dummy are collected and presented here ...
FE-Application in Aircraft Structure Analysis
Dr.-Ing. Matthias Hörmann - CADFEM GmbH, Germany
 
Soft Soil Impact Testing and Simulation of Aerospace Structures
Edwin L. Fasanella, Karen E. Jackson, Sotiris Kellas - NASA Langley Research Center, VA
In June 2007, a 38-ft/s vertical drop test of a 5-ft-diameter, 5-ft-long composite fuselage section that was retrofitted with a novel composite honeycomb Deployable Energy Absorber (DEA) was conducted onto unpacked sand. This test was one of a series of tests to evaluate the multi-terrain capabilities of the DEA and to generate test data for model validation. During the test, the DEA crushed approximately 6-in. and left craters in the sand of ...
A Numerical Investigation for Rock Fall Impact Behavior of Pithead of Tunnel with Falling Weight Impact Loading
Abdul Qadir Bhatti, Khaliq U Rehman Shad - National University of Sciences & Technology NUST, Pakistan
Norimitsu Kishi - Muroran Institute of Technology, Muroran
In order to establish a rational impact resistant design procedure for Arch type rock-shelter based on not only allowable stress design but also on ultimate state design and/or performance based design method, impact resistant capacity and/or maximum input impact energy for the RC structures must be clearly estimated. At present, the RC structures have been designed statically based on allowable stress design method. Here, maximum input ...
18 Wheel Truck Dynamic and Durability Analysis using Virtual Proving Ground
Ramesh Edara, Shan Shih - ArvinMeritor Inc.
Nasser Tamini, Tim Palmer, Arthur Tang - Engineering Technology Associates
Virtual proving ground (VPG) simulations have been popular with passenger vehicles. VPG uses LS-DYNA® based non-linear contact Finite Element analysis (FEA) to estimate fully analytical road loads and to predict structural components durability with PG road surfaces and tire represented as Finite elements. Heavy vehicle industry has not used these tools extensively in the past due to the complexity of heavy vehicle systems and especially due ...
Visualization of Pareto Optimal Fronts for Multiple Objectives with D-SPEX
Katharina Witowski, Marko Thiele - DYNAmore GmbH
Tushar Goel - Livermore Software Technology Corporation
Most engineering optimization problems require multi-objective optimizations that have no unique optimum because the objectives often conflict. LS-OPT 3.3 offers the capability to simultaneously compute many Pareto optimal solutions using a multi-objective genetic algorithm. The optimization post processing tool D-SPEX provides advanced features to visualize these Pareto optimal solutions and to approximate the Pareto optimal front using ...
Influence of the Residual Welding Phenomena on the Dynamic Properties of a Two-Meter Long Tube with 64 Non-Symmetrical Brackets Welded on a Helical Path
S.V. Medvedev, M.V. Petrushina, O.P. Tchij - United Institute of Informatics Problems NAS of Belarus
Welded elements of a two meter long tube is considered. The welded structure rotates with 100rad/sec. The non- symmetrical brackets are connected to the tube through by the welds of a curved trajectory that consists of circumferential parts and arbitrary curved part on a shaft surface and disposed on the tube in a helical sequence. The objective of the study was to explore the axis and hoop stress distribution on the shaft tube and its ...
Multi-Disciplinary Design Optimization for Occupant Safety: Leveraging Your LS-DYNA® Simulations
Gaëtan Van den Bergh, Yves Lemmens - LMS International
Automotive companies have become increasingly educated in safety related performance, setting the bar higher for automotive crashworthiness. Process Automation and Design Optimization (PIDO) tools help LS-DYNA users to reach these safer designs in a shorter period. In this paper, various application cases are used to demonstrate how PIDO tools can leverage your existing simulation codes. In the first application case, a multi-disciplinary ...
Direct Multi-objective Optimization through LS-OPT® using Small Number of Crashworthiness Simulations
Tushar Goel, Nielen Stander - Livermore Software Technology Corporation
Yih-Yih Lin - HP
Genetic algorithms typically require a large number of simulations, which would be economically prohibitive for crash simulations without the advent of today’s cost-effective multi-core computers. A study is conducted to seek improvements while restricting the number of simulations and exploiting the ability to use parallelization. The parallelization, achieved by simultaneously running multiple simulations for each GA generation on a HP ...
Simulation of Acoustic and Vibro-Acoustic Problems in LS-DYNA® using Boundary Element Method
Yun Huang - Livermore Software Technology Corporation
Mhamed Souli - University of Lille, France
The present work concerns the new capability of LS-DYNA® in solving acoustic and vibro-acoustic problems. In vibro-acoustic problems, which are assumed to be weak acoustic-structure interactions, the transient structural response is computed first. By applying the FFT, it is transformed into a frequency response. The obtained result is taken as boundary condition for the acoustic part of the vibro-acoustic problem. Consequently, the radiated ...
Development of an Airbag Landing System for the Orion Crew Module
Benjamin Tutt - Airborne Systems
R. Keith Johnson, Karen Lyle - NASA Langley Research Center
Airborne Systems (formally Irvin Aerospace Inc) has developed an Airbag Landing System design for the Orion Crew Module of the Crew Exploration Vehicle. This work is in support of the NASA Langley Research Center Landing System Advanced Development Project. Orion is part of the Constellation Program to send human explorers back to the moon, and then onwards to Mars and other destinations in the Solar System. A component of the Vision for ...
Comparison of Analytical and Numerical Results in Modal Analysis of Multispan Continuous Beams with LS-DYNA
Abhijit Mahapatra, Avik Chatterjee - Central Mechanical Engineering Research Institute, India
This paper deals with the study of natural frequencies of vibration of continuous beams supported on hinged end supports with and without overhang. The paper illustrates the analytical formulation of the natural frequencies and corresponding modes of a n-span continuous beam by using a general solution for the Euler-Bernoulli differential equation. Using two different approaches, namely the analytical method and the numerical method some ...
Optimization and Sensitivity Analysis of Numerical Simulation of Tubular Hydroforming
Honggang An, Daniel E. Green - University of Windsor, Canada
Optimization and sensitivity analysis is important although difficult to obtain for tubular hydroforming, because of the implicit relationship between the load path variables (internal pressure and tube end displacement) and the dependent variables (such as stress, strain and final tube thickness). In this paper, the Taguchi method was used in conjunction with virtual hydroforming experiments using LS-DYNA® to carry out the sensitivity ...
Tippe Top Simulation by LS-DYNA
Mitsuhiro Makino - Fujitsu Limited
The tippe top is a toy consisting of a section of sphere and a short rod. When tippe top, whose rod is at top, is rotating, it automatically inverts and the position of center of mass is raised. This toy is simulated by LS-DYNA.
Material Constitutive Parameter Identification using an Electromagnetic Ring Expansion Experiment Coupled with LS-DYNA® and LS-OPT®
Ismael Henchi, Pierre L’eplattenier, Nielen Stander - LSTC
Glenn Daehn, Yuan Zhang, Anupam Vivek - The Ohio State University
In this paper, a parameter identification procedure to obtain the constitutive properties of metals at high strain rate and high temperature is presented. This procedure uses experimental results from electromagnetic ring expansions, coupled with LS-DYNA® simulations using the newly developed electromagnetism module, driven by LS-OPT®. The experiments were performed at The Ohio State University and the expansion velocities of the ring were ...
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