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10th International LS-DYNA Conference

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 ...
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 ...
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 ...
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 ...
Novel Multi-scale Modeling of Woven Fabric Composites for use in Impact Studies
Gaurav Nilakantan, Michael Keefe, John W. Gillespie Jr. - University of Delaware
Travis A. Bogetti - US Army Research Laboratory
A novel approach to the multi scale modeling of the impact of woven fabrics using LS-DYNA® has been presented. This new technique entitled ‘Hybrid Element Analysis (HEA)’ incorporates the use of different finite elements at both a single and multiple level of modeling. A yarn level resolution is maintained around the impact zone or local region, while a homogenized resolution has been used for the far field or global region. The central patch ...
Numerical and Experimental Determination of Strains in the Vicinity of a Centrally Located Circular Discontinuity in AA6061-T6 Square Extrusions during Axial Crushing
Neil Turton, Amitabha Majumder, William Altenhof, Daniel Green, Vivek Vijayan, Honggang An,Shun Yi Jin - University of Windsor, Canada
An experimental and numerical investigation was conducted on AA6061-T6 extrusions with centrally located through-hole discontinuities to investigate the strains in the vicinity of the crush trigger. The extrusions used in this research were of square cross sectional geometry with a nominal side width of 38.1 mm, wall thickness of 3.15 mm and length of 200 mm. Centrally located circular discontinuities with a diameter of 14.29 mm ...
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 ...
On Closing the Constitutive Gap Between Forming and Crash Simulation
F. Neukamm, M. Feucht, K. Roll - Daimler AG, Germany
A. Haufe - DYNAmore GmbH, Germany
With increasing requirements on crashworthiness, and light-weight car body structures being a central issue in future automotive development, the use of high strength steel qualities has become wide-spread in modern cars. Since these materials often show significantly lower ductility than conventional steels, it is of great importance to precisely predict failure under crash loading conditions. Hence constitutive models in crashworthiness ...
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 ...
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 ...
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 ...
Preliminary Results for an Isogeometric Shell
David J. Benson - Dept. of Structures, UCSD
Yuri Bazilevs, Thomas J. R. Hughes - ICES, U Texas Austin
Preliminary Results for an Isogeometric Shell
David J. Benson - Dept. of MAE, UCSD
Yuri Bazilevs, Thomas J. R. Hughes - ICES, The U.T. Austin
Piecewise continuous Lagrangian polynomials are the traditional interpolation functions used in the finite element method. They work well for many applications, but they also have shortcomings for many important applications. For example, in metal forming, the dies are designed using CAD programs and their geometry is defined in terms of NURBS (non-uniform rational B-splines) which can not be exactly replicated with a piecewise ...
Ramp Wave Compression in a Copper Strip Line: Comparison Between MHD Numerical Simulations (LS-DYNA®) and Experimental Results (GEPI device)
Gaël Le Blanc,Patrice LaPorte,Gilles Avrillaud, Paul Vincent - ITHPP, France
Pierre-Yves Chanal, Pierre-Louis Hereil - Centre d’Etudes de Gramat, France
Pierre L’eplattenier - LSTC, USA
GEPI [3][4] is a pulsed power generator developed by ITHPP for Centre d’Etudes de Gramat (CEG) devoted to ramp wave (quasi isentropic) compression experiments in the 1 GPa to 100 GPa range and to non shocked high velocity flyer plate in the 0.1 km/s to 10 km/s range. The aim of this paper is to compare numerical simulation and experimental results on a 3D GEPI configuration. A coupled mechanical / thermal / electromagnetism ...
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 ...
Simple Input Concrete Constitutive Models: An Illustration of Brick Wall & Concrete Cylinder Perforation
Leonard E. Schwer - Schwer Engineering & Consulting Services
Analysts faced with making predictions that involve uncharacterized materials need to bound their results in a rational manner. For concrete materials, LS-DYNA® includes three simple input concrete material models that provide strength envelopes ranging from low, to intermediate, and high strength. Using a range of concrete strengths in numerical simulations is rational when little or no other information about the concrete is available. The ...
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 ...
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 ...
Simulation of Composite Tubes Axial Impact with a Damage Mechanics Based Composite Material Model
Xinran Xiao - General Motors Corporation
Composite tube axial impact is a benchmark problem measuring the predictive capability of composite crash simulation. A previous work revealed that MAT58 in LS-DYNA®, a continuum damage mechanics (CDM) composite material law based on Matzenmiller-Lubliner-Taylor (MLT) model, is inadequate in representing the unloading response of composite tubes that form continuous fronds in axial impact testing. To address the issue, two approaches have ...
Simulation of Energy Absorption in Braided Composite Tubes through Axial Crushing
Carla McGregor, Reza Vaziri - The University of British Columbia, Canada
Xinran Xiao - General Motors Corporation
Modeling damage propagation and energy absorption in composite tubular structures under axial compression is a challenging task due to the complex nature of damage growth in composites. In this paper, our model (CODAM for COmposite DAMage), which is incorporated into LS-DYNA® as a user material model, is used to simulate the axial crushing response of braided composite tubes. Recent improvements to the finite element model include the ...
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 ...
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 ...
Statistics and Non-Linear Sensitivity Analysis with LS-OPT® and D-SPEX
H. Müllerschön, M. Liebscher - DYNAmore GmbH, Germany
W. Roux, N. Stander - LSTC
U. Reuter - TU Dresden, Germany
For stochastic simulations usually many simulations are performed, therefore much information is available for the simulation engineer. In order to evaluate this information and to assess the results of stochastic investigations soft- ware tools such as LS-OPT and D-SPEX are available. Good and clearly arranged presentation of the results is important, so that the engineer really benefit from the data mining. D-SPEX is intended to provide ...
Structural Analysis with Vibro-Acoustic Loads in LS-DYNA
Mostafa Rassaian, JungChuan Lee, Thomas T. Arakawa - Boeing Phantom Works Structures Technology
Yun Huang, Livermore Software Technology Corporation
Many structures are designed to operate in hot temperature and stringent aero-acoustic fatigue environment, e.g. the engine inlet and the heat shield of aircraft are subject to high temperature and sonic pressure level. It is important to evaluate the dynamic response of the structures exposed to both vibration and acoustic sources of excitations. A new feature of structural analysis with vibro-acoustic loads has been implemented in ...
Structural Dynamic Response of a Track Chain Complete Undercarriage System using Virtual Proving Ground Approach
Marco Perillo, Vito Primavera - EnginSoft SpA
Giorgio Bonello, Marco Cavedoni - Italtractor ITM Spa
ITM Group Engineering Department uses advanced tools as finite element method for static structural analyses of undercarriages, side frames or undercarriage components, as track chain, rollers and tension devices. In order to integrate the recent prototype concepts into this design process combining full system real time dynamic simulations able to represent a typical situation due to operation manoeuvre, experimental test information and 30 ...
Studies on Behavior of Carbon and Fiberglass Epoxy Composite Laminates under Low Velocity Impact Loading using LS-DYNA
Bhushan S. Thatte, Gautam S. Chandekar, Ajit D. Kelkar - North Carolina A&T State University
Pramod Chaphalkar - Grand Valley State University
The desired characteristics of materials in modern aircraft applications require high specific modulus and high specific strength for low specific weight. Composite structures, fabricated using carbon and glass fabrics in conjunction with epoxy resin manufactured via the heated vacuum assisted resin transfer molding (H-VARTM) process are now being considered as a low cost alternative to conventional materials without compromising ...
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 ...
The Influence of Permanent Volumetric Deformation on the Reduction of the Load Bearing Capability of Plastic Components
P.A. Du Bois - Consultant, Germany
S. Kolling - Gießen University of Applied Sciences, Germany
M. Feucht - Daimler AG, Germany
A. Haufe - DYNAmore GmbH, Germany
During the past years polymer materials have gained enormous importance in the automotive industry. Especially their application for interior parts to help in passenger safety load cases and their use for bumper fascias in pedes- trian safety load cases have driven the demand for much more realistic finite element simulations. For such applica- tions the material model 187 (i.e. MAT_SAMP-1) in LS-DYNA® has been developed. In the present ...
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 ...
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 ...
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.
Use of Simpleware Software for LS-DYNA® Analyses
Brian Walker, Rajab Said - Arup
Philippe Young - Simpleware Ltd
Simpleware have developed a suite of programs that are used to convert imaging data obtained from CT, microCT, MRI or Ultrasound scanning equipment into finite element meshes for use in LS-DYNA. Simpleware provides what is effectively a 3D photocopier: three dimensional replicas can be generated automatically based on scans. In parallel, computer simulations can be used to assess the suitability or performance of objects in operation. ...
Using LS-DYNA® from ANSYS Workbench Environment
Dr.-Ing. Matthias Hörmann - CADFEM GmbH, Germany
Numerical simulations as integral part in the virtual product development process exhibit a huge spectrum. Ranging from simple modal analyses over linear and nonlinear stiffness and strength based problems up to coupled multi- physic analyses, where different physical disciplines interact with each other. Thereby simulation tools in combination with preprocessors must enable users to perform product development tasks faster and therefore ...
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 ...
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 ...
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 ...
Visual-Environment Integrated Pre and Post Environment for LS-DYNA
Shivakumara H Shetty, Velayudham Ganesan, Suthy C Sivalingam - ESI Group
Visual-Environment (VE) is an open collaborative engineering environment framework or platform called as Open VTOS (Virtual Try-Out Space). VE is an integrated suite of solutions, which has different contexts seamlessly linked for Crash and Safety, Durability, NVH and others. The applications of interest for supporting LS-DYNA based processes are: Visual-Crash DYNA (VCD)-a pre processor for LS-DYNA, Visual-SAFE-an advanced pre-processor for ...
VisualDSS CAE Data Management and Decision Support System for Simulation Life Cycle Management
Velayudham Ganesan, Suthy C Sivalingam, Shivakumara H Shetty - ESI Group
Daniel Dooge - ESI North Americas
Simulation industry has matured enough to carry out the design iterations using just the simulation results without relying on expensive prototype testing. Such simulation approaches have drastically reduced the product development lead time, cost and product failures. Engineers and managers spend most of their time on non engineering activities searching for information, learning simulation tools and workflows, hackneyed ...
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 ...
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.