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14th International LS-DYNA Conference

Detroit, 2016

Simulation of Wear Processes in LS-DYNA ®
Thomas Borrvall, Anders Jernberg, Mikael Schill (DYNAmore Nordic AB)
Liang Deng, Mats Oldenburg (Luleå University of Technology)
Wear is an important life-limiting factor of hot forming tools and contributes to the high costs involved in the event of tool replacements and consequential lost production. It is therefore important to understand the complex mechanisms behind wear and to be able to assess the damage it leads to in order to improve tool design. By means of computer simulations and sophisticated wear laws this can be done in a virtual environment, and the aim ...
Staged Construction of an API 650 Tank on a Settling Foundation
Alexander Hay, Rudy du Preez, Roelof Minnaar (Advanced Structural Mechanics (Pty) Ltd)
The staged construction of an API 650 tank is analyzed in this paper. The tank is considered to be erected on a foundation that is initially irregular, and which then experiences differential settlement during the course of construction. The consequence of foundation settlement and initial irregularity is that the final shape of the tank deviates from the intended cylindrical shape. During construction, each strake is added to the tank by ...
Statistical Energy Analysis for High Frequency Acoustic Analysis with LS-DYNA 
Zhe Cui, Yun Huang (LSTC)
Mhamed Souli (Lille University Laboratoire Mecanque de Lille)
Tayeb Zeguar (Jaguar Land Rover Limited)
The present work concerns about the new capability of LS-DYNA  in solving high frequency vibration and acoustic problem, using statistical energy analysis (SEA). As the frequency increases, the number of modes increases. As the result, the traditional numerical methods like finite element (FEM) and boundary element method (BEM) are difficult to use due to the large number elements requirement. It is more practical to consider average ...
Study on Ultra-high Electro-Magnetic Flux Generation using LS-DYNA ® Multi-Physics Capability
Kunio Takekoshi (Terrabyte Co., Ltd.)
Simulation results about two kinds of Electro-Magnetic Flux Generation Methods using LS-DYNA Multi-Physics capability are reported in this paper. It is revealed that the Burgess Model should be considered to model electrical conductivity as functions of relative volume as well as temperature, and that hourglass control type 6 should be used in order to precisely predict the generation of magnetic flux density and the deformation of coil for ...
Test and Numerical Simulation of Fixed Bollard and Removable Bollard Subjected to Vehicle Impact
Choon-Keat ANG, Siew-Fern LIM, Jing-Yan KONG (Prostruct Consulting Pte Ltd)
Crash bollard system is a type of physical security measures used to prevent forced entry by vehicles, as well as to provide adequate standoff distance between the target and a Vehicle-Borne Improvised Explosive Device (VBIED). Thus, the design of crash bollard system will have to take into consideration against high- energy vehicle impact and minimizing the post-impacted penetration. In this paper, fixed bollard and removable bollard ...
Test and Simulation Comparison using Titanium Material Models based on MAT224
Leyu Wang, Sean Haight, Kelly Carney, Paul DuBois, Cing-Dao Kan (George Mason University)
Filippo Dicecca (Department of Aerospace Science and Technology)
William Emmerling (Federal Aviation Administration)
Titanium plate impact tests are simulated with *MAT_224, an elasto-visco-plastic material model in LS-DYNA ® with tabulated stress versus strain curves as well as tabulated strain rate and temperature dependency. The *MAT_224 input deck is built upon a series of tensile, shear and compression tests at different strain rates and temperatures conducted on a 0.5" commercial off-the-shelf titanium plate. The input of *MAT_224 is generated so that ...
The Influences of Tensile Test Directions and Yield Stress Selections on the FE Results of TBF1180 U-Channel
Zhiguo Qin, Ching-Kuo Hsiung (General Motor Company)
There is no standard on how to decide the yield stresses of Advanced High Strength Steel (AHSS) sheet materials. Is it necessary to decide the accurate yield stresses of AHSS materials in stamping FE simulations? A U-Channel part and TBF1180 material were selected to study this question.TBF1180 is a new third generation AHSS sheet metal. Three uniaxial tensile tests on 0 o (L), 45 o (D) and 90 o (T) directions with respect to the rolling ...
The LS-TaSCTM Multipoint Method for Constrained Topology Optimization
Willem Roux (LSTC)
The new multi-point constrained optimization scheme is for the constrained topology design of highly nonlinear structures for which analytical design sensitivity information is hard to compute. These highly nonlinear structures are designed for multiple load cases and multiple constraints, which means that the final design should have load paths for each load case as well as satisfy the constraints. This is done here by using two sets of ...
The Recent Developments of the Metal Forming Modules in LS-PrePost ® (1) - The EZSetup and 3D-Drawbead Modules
Quanqing Yan, Kevin Zhang, Philip Ho, Li Zhang, Yuzhong Xiao, Xinhai Zhu (LSTC)
New functions have been continuously implemented into LS-PrePost to enhance the metal forming analysis with LS-DYNA. In this paper, two important updates – the EZSetup and the 3D Drawbead - will be introduced. The EZSetup module, which has been used in the production simulations, is further enhanced now by incorporating springback compensation, lancing operation as well as the multi-stage simulation setup with unlimited sets of processes and ...
The recent developments of the metal forming modules in LS-PrePost ® (2) - The Die System Module
Chunjie Zhang, Philip Ho, Yuzhong Xiao, Li Zhang, Xinhai Zhu (LSTC)
New functions have been continuously implemented into LS-PrePost for users to set up the metal forming simulations with LS-DYNA ® . In this paper, the newly added Die System Module will be briefly introduced. Given the designed part shape, the Die System Module can be used to create the forming tool for the subsequent simulation setup in the EZSetup module of LS-PrePost. The functions that would be needed in the tool creating process are, ...
The Significance of the Production Process of FRP Parts for the Performance in Crashworthiness
Christian Liebold, Andrea Erhart, André Haufe (DYNAmore GmbH)
As there is a trend in the automotive industry towards using FRP composites for reducing the weight of vehicles, adequate simulation tools to effectively and accurately predict the structural response of composite structures in crashworthiness are needed. Due to the manufacturing induced fiber orientation, which is particularly for short fiber reinforced composites locally varying, the pointwise mechanical behavior of (S)FRP is a priori unknown ...
Thermal Structural Forming & Manufacturing Simulation of Carbon and Glass Fiber Reinforced Plastics Composites
Ala Tabiei and Raguram Murugesan (University of Cincinnati)
The forming process of composites is presented in this paper. A computational micro-mechanical model of loosely woven fabric is presented and used to simulate the thermos-forming of woven fabric composites. The *PART_COMPOSITE is utilized to represent the resin and woven fabric as integration points through the thickness of the ply. The model, which is incorporated in LS-DYNA ® , accounts for the fiber reorientation, trellis mechanism of the ...
Use of Data Reduction Methods for Robust Optimization
Dominik Borsotto, Lennart Jansen, Robin Strickstrock, Clemens-August Thole (SIDACT GmbH)
Data reduction methods like principle component analysis, singular value decomposition and independent component analysis methods allow analyzing huge sets of data. Applied to simulation results they allow the characterization of major trends in the variation of these results. For the public Chevrolet Silverado example all thicknesses are initially varied independent of each other among a number of simulation results and its correlations are ...
Using Tabulated Experimental Data to Drive an Orthotropic Elasto-Plastic Three-Dimensional Model for Impact Analysis
C. Hoffarth, B. Khaled, S. D. Rajan (Arizona State University, Tempe)
R. Goldberg, K. Carney (NASA-GRC, Cleveland)
Gunther Blankenhorn (LSTC)
An orthotropic elasto-plastic-damage three-dimensional model with tabulated input has been developed to analyze the impact response of composite materials. The theory has been implemented as MAT 213 into a tailored version of LS-DYNA ® being developed under a joint effort of the FAA and NASA and has the following features: (a) the theory addresses any composite architecture that can be experimentally characterized as an orthotropic material and ...
Validating Innovative Design Solutions - Analysis of the Gerald Desmond Bridge Replacement
Francois Lancelot, Dong-Ling Li, Mark Nelson, Matt Carter (Arup)
In 2011, the Port of Long-Beach, in collaboration with Caltrans and LA Metro, awarded the Design and Build contract for the replacement of the deteriorating Gerald Desmond Bridge to SFI Construction (Schimmick / FCC /Impregilo joint-venture). Arup had been lead designer for SFI’s tender proposal, providing structural andgeotechnical engineering, traffic operations analysis, lighting design and civil engineering services. Arup designed an elegant ...
Validation of the ALE Methodology by Comparison with the Experimental Data Obtained from a Sloshing Tank
Alexander L. Kozak, Payman Khalili Tehrani, T. Eric Abrahamson, Alexander V. Krimotat (SC Solutions, Inc., Sunnyvale)
Arbitrary Lagrangian – Eulerian (ALE) methodology has been used in Fluid - Structure Interaction (FSI) analyses with LS-DYNA ® for a variety of problems. Validation of ALE solutions by comparison with experimental data provides assurance that the solutions represent the physical world. A water tank under horizontal harmonic excitation tested by O. M. Faltinsen and O. F. Rognebakke [1] is used for validation. The experimental time histories ...
Vehicle Seat Bottom Cushion Clip Force Study for FMVSS No. 207 Requirements
Jaehyuk Jang (CAE Body Structure Systems General Motors)
Federal Motor Vehicle Safety Standard (FMVSS) No. 207, "Seating Systems," establishes requirements for seats, their attachment assemblies, and their installation, to support robust design for seat attachment to Body under vehicle impact. General Motors has been continuously improving the CAE procedure for this Safety Standard. This presentation introduces a CAE simulation method that was specifically developed to accurately simulate a ...
Vibration Analysis of a Compressor Blade at High Temperature
Devon Downes, Manouchehr Nejad Ensan (Aerospace Portfolio, National Research Council)
This paper summarizes the vibration analysis of a stage two T56 compressor blade at high temperature. First, an implicit thermal analysis was performed to elevate the blade’s temperature to 700°C. The output parameters of this analysis were then used as a “pre-stress” condition of the blade prior to starting the vibration analysis. Velocity results obtained using numerical simulations were compared to experimental results. The simulation was ...
Virtual ROPS and FOPS Testing on Agricultural Tractors According to OECD Standard Code 4 and 10
D. Hailoua Blanco, C. Martin, A. Ortalda (EnginSoft S.p.A)
The Roll Over Protection Structure (ROPS) and Falling Object Protective Structure (FOPS) are key safety features in agricultural and forestry tractors in order to avoid or limit risks to the driver in case of roll over or falling objects during normal use. The Organization for Economic Co-operation and Development (OECD) in an effort to improve operator’s safety in Agricultural and Forestry Tractors has set up harmonized testing procedures ...
WorldSID 5% Dummy Model Development in Cooperation with German Automotive Industry
Sebastian Stahlschmidt, George Dumitru
Yupeng Huang, Ulrich Franz (DYNAmore GmbH)
The paper describes the methodology used to develop the PDB and FAT Dummy models. The models are used by almost all OEMs and restraint system suppliers to enhance the passive safety performance of their vehicles. Nevertheless, the PDB is still launching new projects to further enhance the predictability of the ES-2, ES-2re, BioRID-II and WorldSID models. This paper presents the current state of a new project to develop the WorldSID 5% model. ...