LS-DYNA&JSTAMP Forum 2009

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Program

Tuesday, October 27 / Wednesday, October 28



Abstract

*The contents of the program may be subject to change without notice.

10/27 10:10- General Session(1)
SUBARU's Approach in Crashworthiness CAE Mr.Seiji Matsumoto, Fuji Heavy Industries LTD.
SUBARU has introduced computer analysis technology of crashworthiness from the development of 3rd generation Legacy. Authors will report various CAE approaches in the development of 3rd, 4th, and 5th generation Legacy.In the development of cars, CAE engineers constantly face following requirements: (1) to improve accuracy of analysis, (2) to cope with new crashworthiness items, (3) to speed up analysis for shorter development period. These requirements reflect increasing market demand for better crashworthiness. In addition, SUBARU's target for the world's leading impact safety performance needs higher accuracy analysis.

10/27 11:10- General Session(1)
Experimental and Numerical Investigation of Fracture in Aluminum Mr.Paul Du Bois, Hermes Engineering NV
To assess the problem of containment after a blade-off accident in an aero-engine by numerical simulation the FAA has instigated a research effort concerning failure prediction in a number of relevant materials. Aluminium kicked off the program which involved an intensive testing program providing failure data under different states of stress, different strain rates and different temperatures. In particular split Hopkinson bars were used to perform dynamic punch tests on plates of different thicknesses allowing to investigate the transition between different failure modes such as petaling and plugging. Ballistic impact tests were performed at NASA GRC for the purpose of validation. This paper focuses on the numerical simulation effort and a comparison with experimental data is done. The simulations were performed with LS-DYNA and a tabulated version of the Johnson-Cook material law was developed in order to increase the generality, flexibility and user-friendliness of the material model.

10/27 13:30- Proposal session
A study of simulation taking thermoplastic properties into consideration with MAT_SAMP-1. Mr.Kunio Takekoshi, Terrabyte co., Ltd.
MAT_SAMP-1 is a material model introduced in the release of LS-DYNA Ver.971, and various properties of thermoplastic substances can be taken into consideration in analyses with the model. Therefore we can obtain more accurate results from CAE calculations for plastic products with the constitutive model by considering/simulating phenomena, which are not identified in metals, such as not only pressure dependent yield surface defined by tensile/compression/shear stress - strain data but also non-isochoric behavior during plastic deformation, a damage effect and stiffness decreasing due to the effect. In this session, we report analysis results to investigate the function of MAT_SAMP-1 and show the availability of this material model.

10/27 13:55- Proposal session
Highlights of Primer 9.4 Mr.Richard Taylor, Arup
This paper shows some of the new features of Primer 9.4, which will be released towards the end of 2009.

10/27 13:30- Analysis environment session
Novel HPC Technologies for Scalable CAE: The Case for Parallel I/O and File Systems Mr.Takahiko Tomuro, Scalable Systems Co.,Ltd.
CAE parallel efficiency and job turn-around times continue to be important factors behind engineering and scientific decisions to develop models at higher fidelity. As HPC continues an aggressive expansion of Linux clusters based on multi-core processor architectures, expectations grow for large-scale clusters to meet the I/O demands of increasing fidelity in CAE modeling and workflow data management. The deployment of network attached storage (NAS) offers several advantages of shared storage and ease-in-management, but their legacy NFS file systems are serial, and limit the overall scalability of parallel CAE applications with I/O requirements. Entirely new storage system and software architectures have been introduced that combine key advantages of legacy shared storage, yet eliminate the drawbacks that have made them unsuitable for large distributed cluster deployments. This new class of parallel file systems and shared storage architectures was developed for parallel I/O to enable overall scalability of parallel CAE simulations. This lecture will examine the CAE motivation for parallel file systems and storage, and the I/O requirements for multi-physics LS-DYNA applications on production-level Linux clusters with proper balance for I/O and data management.

10/27 13:55- Analysis environment session
"Manufacturing" From customers' point of view utilizing CAE Mr.Nobuhito Nakagawa, LION Corporation
Lion Co.has been examining ways to design containers utilizing CAE since 1980s. Now, CAE is used as "Visualization of the phenomenon" and "Validating ideas". Last year, CAE information management tool "CAESAR" was developed and introduced to make CAE operations efficiently. As a result, it was possible to run ALD(Analysis Leads Design) conception. Also, I will mention about the effects to the design team when CAE and industrial design is combined.

10/27 14:30- LS-DYNA Session
Dynamic analysis of front fork for motorcycle by LS-DYNA Mr.Shozo Tokumitsu, KYB Corporation
The virtual testing model of the real structure corresponding that was able to consider the elastic deformation of the front fork and the tire, was constructed with LS-DYNA.The response evaluation of the front fork including the behavior of the tire was enabled by this analysis.

10/27 14:55- LS-DYNA Session
Multi-Objective Design Exploration of Automotive Tires Using Self-Organizing Map Dr.Masataka Koishi, The Yokoham,a Rubber Co.,Ltd.
Since tires carry out many functions and many of them have tradeoffs, it is important to find the best combination of design variables so-called sweet spot and/or to obtain design knowledge which is the relationship among design variables and Pareto solutions. In this presentation, a multi-objective design exploration by means of multi-objective optimization and data mining techniques for example self-organizing map is introduced and applied it to the tire design problem to improve wear performances. The wear performance is evaluated by LS-DYNA, and multi-objective genetic algorithm is used to find Pareto solutions. We also would like to talk about the outlook of design exploration using data mining techniques.

10/27 15:20- LS-DYNA Session
Development of a Flex-PLI LS-DYNA Model Mr.Masahiro Awano, Mr.Isamu Nishimura, Mitsubishi Motors Corporation (presenter)Mr.Shinya Hayashi, JSOL Corporation
A biofidelic flexible pedestrian legform impactor (Flex-PLI) has been developed by Japan Automobile Manufacturers Association, Inc. (JAMA) and Japan Automobile Research Institute (JARI). The Flex-PLI has good biofidelity as well as several knee ligament elongation measurement capabilities, three femur and four tibia bending moment measurement capabilities. This paper introduces a finite element model of the Flex-PLI type GT for LS-DYNA. The Flex-PLI type GT LS-DYNA model was carefully created to ensure every important detail was included. Geometries, masses and material properties of all parts were reproduced from drawings and inspection of the real components. Connectivity and component interaction within the model was determined by thorough experiments. Accurate prediction of injury indices and kinematic behaviour was achieved by correlation to static and dynamic calibration tests. A fine mesh was used but reasonable calculation cost assured by imposing an analysis time step of 0.9 micro seconds.

10/27 15:45- LS-DYNA Session
A simulation for fracture prediction of polymeric product based on damage Mr.Junichi Takahashi, ASAHI KASEI CHEMICALS CORPORATION
A simulation for fracture prediction of polymeric products is lately recognized as one of the most important industrial themes. To cope with this demand, a simulation using the material model for polymers is recently investigated in Asahi-Kasei Group. In this presentation, an impact fracture of polymeric product is predicted in LS-DYNA by using the material model with damage peculiar to polymer. The present material model developed by Asahi-Kasei is installed in LS-DYNA through the user subroutine. Moreover, a simulation with SAMP-1 is also performed. The validity for simulations with these two material models is evaluated by comparing the numerical results with an experimental result.

10/27 14:30- JSTAMP(Manufacuturing) Session
Development of stamping technology for high tensile strength steel plates using CAE Mr.Kenjiro Ishida, TOYOTA MOTOR CORPORATION
The increased use of high tensile strength steel is required to ensure vehicle structural rigidity to meet collision safety standards as well as to reduce vehicle weight. High tensile strength steel is known for its wide elastic range and its variation in material properties, therefore, robust forming technique is necessary. We report our research on robust forming of high tensile strength steel using CAE, aimed for mass production.

10/27 14:55- JSTAMP(Manufacuturing) Session
TBA
TBA

10/27 15:20- JSTAMP(Manufacuturing) Session
Trial for predicting surface defect in outer panel forming Mr.Kazuhiro Shimizu, MIYAZU SEISAKUSYO CO.,LTD.
TBA

10/27 15:45- JSTAMP(Manufacuturing) Session
Application of ductile fracture criteria to Cashime Formability Mr.Tomohiro Kamiura, SHIROKI Corporation
TBA

10/27 16:25- General Session(2)
Introduction of JSOL's CAE / Engineering Service JSOL Corporation

10/27 17:10- General Session(2)
Recent developments in LS-DYNA Dr.John O. Hallquist, Livermore Software Technology Corporation