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12th International LS-DYNA Conference 2012

Simulation Technique for Pre-forming of AHSS Edge Stretching
X. Chen (United States Steel Automotive Center), J. Sun, X. Zhu (LSTC)
Edge cracking in advanced high strength steels (AHSS) is one of the main failure modes in many sheet metal stamping processes. Pre-forming into a wave (or scallop) shape at the edge is a common technique used to gain material at high edge stretch regions in preparation for the subsequent edge stretch processes. The accurate simulation of this multi-stage forming process remains a challenging task since these edges experience ...
Simulations of Axial Impact of Composite Structures with a Coupled Damage-Plasticity Model
X. Xiao (Michigan State University)
Under axial impact, a composite structure can split into pieces at the crush front while maintaining an apparent structural integrity in its uncrushed portion. In this way, the structure is capable of sustaining large deformation under a sufficiently high load. To simulate this behavior, the constitutive model must be able to describe the response of a substantially damaged composite under dynamic loading. The constitutive behavior beyond ...
Studies on the Efficiency of LS-DYNA in Sheet Metal Stamping for Feasibility and Formability Analyses
C. Roman (General Motor Company), J. Sun (LSTC), G. Hsiung (General Motor Company), X. Zhu (LSTC)
Feasibility and formability analyses serve different purposes in automotive panel designing. The turnaround cycle of forming simulation is essential, since the designs change very frequently in early stage of vehicle development. The goal of this study is to evaluate the feasibility by using LS-DYNA ® as an alternative to Autoform for both early product evaluations, as well as more detailed formability analysis in GM’s production ...
Techniques for Modeling Torque Transfer between Concentric Cylindrical Components
Richard Tejeda (InForm Product Development, Inc.)
Finite elements that use a piecewise linear approximation of geometry are perfectly adequate for modeling cylindrical components such as shafts and hubs in many applications. However, linear elements present a challenge to the assessment of contact interfaces between curved surfaces, namely that faceted surfaces have peaks and valleys that can interlock with each other. A good example is when torque is transferred between a shaft and a hub ...
Tensile and Shear Element Erosion in Metal Foams
S. Szyniszewski (Dept. of Civil Eng., Johns Hopkins University), B. Smith, S. Arwade (Dept. of Civil and Env. Eng., University of Massachusetts), J. Hajjar (Dept. of Civil and Env. Eng., Northeastern University), B. Schafer (Dept. of Civil Eng., Johns Hopkins University)
The goal of this paper is to simulate fracture observed in tensile and shear tests of steel foam specimens. Deshpande-Fleck plasticity was employed for numerical modeling, and calibrated against compressive and tensile experiments. Steel foam has plastic yield stress, and can deform under compressive load beyond 60% engineering strain. Unlike in compression, steel foam fractures at a small strain in tension. Weak tensile behavior is captured ...
The ACP Process Applied to the FutureSteelVehicle: The Future of Product Design and Development
A. Farahani (ETA Inc.), J. R. Shaw (United States Steel Corporation)
WorldAutoSteel completed FutureSteelVehicle program (FSV) in May of 2011 with the aim to help automakers optimize steel body structures for electrified vehicles. The program objective was to develop detailed design concepts and fully optimize a radically different body structure for a compact Battery Electric Vehicle (BEV) in production in the 2015-2020 timeframe. This paper will provide an overview of the development of an ...
The new Topcrunch Benchmark Data CAR2CAR for LS-DYNA MPP971R5
M. Makino (Dynapower Corp.)
CAR2CAR-ver10 has been used as benchmark data of Topcrunch since 2006. By the enhancement of tied contact in MPP971R5, this data do not work, since the slave nodes of constrained tied contact are released when master segments contain rigid body. CAR2CAR is revised to work for MPP971R5. This paper summarizes tied contact, then explain how to modify the data.
Topology Optimization for Crash
K. Witowski, A Erhart, P. Schumacher, H. Müllerschön (DYNAmore GmbH)
This paper is contributed to the topology optimization of structures under highly nonlinear dynamic loading, e.g. crash. We present our experiences with two software tools: LS-TaSCTM (developed by LSTC, available since 2009, the first version was named LS-OPT/TopologyTM) and Genesis-ESL ® (developed by VR&D) and highlight the possible application areas, capabilities and limitations of the implementations. LS-TaSC nonlinear topology ...
Update on the Electromagnetism Module in LS-DYNA
P. L'Eplattenier, I. Caldichoury (Livermore Software Technology Corp.)
An electromagnetism module is being developed in LS-DYNA version 980 for coupled mechanical/thermal/electromagnetic simulations. The physics, numerical methods and capabilities of this module will be introduced. Some examples of industrial applications will be presented. These include magnetic metal forming and welding in different configurations, high pressure generation for equation of state studies and material characterization, induction ...
Updates to LSTC's LS-DYNA Anthropomorphic Models
C. Maurath, S. Guha (LSTC)
This paper shows the progress of LSTC's LS-DYNA crash test dummy model development effort. It is an update to the presentation and paper “Overview of LSTC’s LS-DYNA ® Anthropomorphic Models”, presented at the 11th International LS-DYNA Users Conference. Updates and details of all released models are presented. The development status of models currently under development is addressed. Outlook to future models is given.
Use of the Combustion and Stochastic Water Spray Modules in the LS-DYNA Compressible Flow Solver
K.-S. Im, Z.-C. Zhang, G. Cook, Jr (LSTC)
Recent development of the chemistry and stochastic water spray modules in the CESE LS-DYNA® compressible flow solver will be reported in this presentation. For the chemistry, detailed descriptions about CHEMKIN input files including the thermodynamics and transport data files will be presented. How to construct of the keyword files is also demonstrated for the various chemically reactive flows. Limitations of the current chemistry module and ...
Using Cloud Computing to Reduce Simulation Turnaround Times and Increase Simulation Throughput
S. Yang (IMMA), A. Dittmer (Pengium Computing)
FEA simulation throughput directly impacts productivity in any engineering organization that uses computational simulations in their design workflows. In the typically iterative design process, higher simulation throughput and shorter turnaround times allow for exploring more design parameters which in turn results in product designs that are closer to the elusive ‘optimal’ solution. On the other hand, the limited availability of ...
Validation and Material Modeling of Polymers by Employing MAT_SAMP-1
K. Takekoshi, K. Niwa (Terrabyte Co.)
We have developed a method to determine plastic Poisson’s ratio and its corresponding stress – strain curves, where newly redefined true stress expression including elastic and plastic Poisson’s ratios is employed. The plastic Poisson’s ratio is used to predict permanent volumetric deformation which is one of the mechanical characters associated with crazing. Although the crazing is one of the most important issues to be tackled in analysis, ...
Validation of LS-DYNA MMALE with Blast Experiments
Y. Huang, M. R. Willford (Arup), L. E. Schwer (Schwer Engineering & Consulting Services)
The general multi-material arbitrary Lagrangian-Eulerian (MMALE) solver is available in the finite element ®analysis software LS-DYNA . In the context of blast simulation, this solution approach involves explicit modeling of the explosive, the blast transmission media and the structure subjected to the blast within the MMALE solver. This paper presents a validation study of the LS-DYNA MMALE approach with existing experimental studies ...
Validation Process of the Electromagnetism (EM) Solver in LS-DYNA v980: The TEAM Problems
I. Caldichoury, P. L'Eplattenier (Livermore Software Technology Corp.)
LS-DYNA version 980 includes an electromagnetic (EM) solver that can be coupled to the solid mechanics and thermal solvers of LS-DYNA to take full advantage of its capabilities to successfully solve complex industrial applications such as magnetic metal forming or welding, induced heating, and so forth. This paper will provide some insight on the validation process that is currently under way and focus on the so-called TEAM (Testing ...
Virtual Prototyping for Safer Product Development: Integrated Marine Propulsion and Steering System Example
M. Perillo, D. Schiavazzi, V. Primavera (EnginSoft SpA), D. Sacchi (ZF Marine)
Abstract ZF Marine’s POD Drive is an innovative marine integrated propulsion and steering system with increased performances compared to traditional shaftline systems in term of efficiency, manoeuvrability, ease of control and dimensions. The system comprises an inboard/outboard transmission and double motor electrical steering pod system equipped with counter-rotating propellers. An electronic control system manages one or more PODs and ...