Wednesday, December 1 11:20-

[New Technology]
LS-DYNA in the prior design of the flying distance performance of the golf club

Mr.Yukihiro Teranishi, MIZUNO CORPORATION

The top priority subject of the performance of the golf club says a flying distance. The flying distance is almost fixed with a launch condition called "3 elements of flying distance", the velocity/angle/spin of the golf ball just after impact. And I got possible to get these three conditions with practical precision by impact analysis with a multilayered structure body made of 3-5 kinds visco-elasticity materials called the golf ball and the mainly metal hollow structure body called the golf club. With the highly precise contact power by the impact analysis, highly precise prior design of the impact sound is enabled recently.

Wednesday, December 1  11:45-  

[New Technology]
Performance Benefits of NVIDIA GPUs for LS-DYNA

Mr.Stan Posey, NVIDIA

Current trends in high performance computing (HPC) are moving towards the availability of several cores on the same chip of contemporary processors in order to achieve speed-up through the extraction of potential fine-grain parallelism of applications. The trend is led by GPUs, which have been developed exclusively for computational tasks as massively-parallel co-processors to the CPU. Today's GPUs can provide memory bandwidth and floating-point performance that are factors faster than the latest CPUs. Parallel efficiency and turnaround times continue to be important factors behind engineering decisions to develop LS-DYNA models at higher fidelity. A rapid CAE simulation capability from GPUs has the potential to transform current practices in engineering analysis and design optimization procedures.
This work examines the performance characteristics of LS-DYNA for the latest CPU and GPU technologies available. The results are provided for system configurations of workstations and clusters of multiple server nodes, and for finite element models that are relevant to current industry practice. The motivation for these studies was to quantify the parallel performance benefits of LS-DYNA for the latest generation GPU from NVIDIA, the Tesla 20-series (codenamed Fermi) for implicit finite element models with multi-million DOFs and static and dynamic response load conditions.

Wednesday, December 1 11:20-

[Energy Facility]
A Study of Vibration induced by the Air Plane Impact Load on the Large-scale Structure

Mr.Yoshio Manabe, Terrabyte Co., Ltd.

Safety evaluation of nuclear reactor buildings has been performed since synchronized terrorist attacks in 2001. In these many researches the evaluations of failure and collapse strength of the structures were mainly performed, but very few studies about the vibrations of structure caused by the impact and their influence on the instruments on slabs. At first FE results obtained by using layered shell elements are verified by comparing the fracture behaviors of RC plates subject to impact loads with experimental results. These FE models are applied to a real scale nuclear reactor building and the fracture and vibration of the structure attacked by a large-size airplane is analyzed. From these results it is shown that high frequency accelerations are induced on the slabs and walls apart from the impacted wall of which stiffness is considerably decreased by generated cracks and compressive failure, and that they can lead to serious influences on the important instruments on the floor of the building.

Wednesday, December 1 11:45-

[Energy Facility]
Confinement Analysis of Dual Purpose Metal Cask Subjected to Impulsive Loads due to Aircraft Engine Crash

Dr.Koji Shirai, Central Research Institute of Electric Power Industry (CRIEPI)

Accident scenarios exceeding the design requirements, such as a forced aircraft crash, were considered, and the corresponding analysis have been executed with regard to the assessment of the inherent safety in an interim nuclear spent fuel storage facility with combined transport and storage casks. To succeed early realization of the storage facility, it is important to present whether the forced aircraft crash event might lead a considerable release of radioactive substances into the environment integrity. To investigate of the integrity of the lid structure of the metal cask during the extreme impact loads due to aircraft crash, impact test onto the full-scale metal cask using scale model engine of aircraft has been executed and leak rate from the metallic gasket in the cask also measured at the impact in the test.

Wednesday, December 1 13:30-

[Analysis Technology]
Drop Impact Analysis of Air Conditioning Outdoor Unit

Dr.Liu Jihong, DAIKIN INDUSTRIES, LTD.

To establish drop impact simulation technology of an air conditioning outdoor unit, firstly, we determined constitutive equations of the packing materials and confirmed its validity by drop impact experiments with test pieces. Next, we conducted drop impact experiments and analyses of bottom frames, in which a compressor and a weight are installed, to verify the accuracy of the sheet metal model. Finally, we carried out drop impact experiments and analyses of the structure consisting of a heat exchanger, a motor stand and casing etc, to verify the joint modeling method of sheet metals and etc. This report describes the development method for our drop impact simulation technology of an air conditioning outdoor unit, and introduces an example of the strength and packing design of an air conditioning outdoor unit based on the drop impact simulation technology in the early stages of development.

Wednesday, December 1 13:55-

[Analysis Technology]
Analysis of Deformation and Pressure of Contact Surface of Rubber Block Joints for the XLPE Cables

Dr.Tomohiro Keishi, Sumitomo Electric Industries, Ltd.

A rubber block joint (RBJ) is used for the connection of the XLPE cable. In the design of RBJ, it is necessary to analyze the deformation of RBJ and to calculate the pressure of contact surface between rubber and insulation of XLPE cable when RBJ is manufactured and constructed. Construction processes are expanding the radius of RBJ by pipes, setting RBJ to the center of the connected cables, and fitting rubber on the insulation by moving pipes for expansion of rubber. The deformation of RBJ is analyzed by using nonlinear structural analysis software LS-DYNA and the pressure of contact surface between rubber and insulation is calculated.

Wednesday, December 1 14:20-

[Analysis Technology]
Paper Helicopter fall FSI Simulation Using LS-DYNA -Fluid Structure Interaction of Air and Paper -

Mr.Shozo Tokumitsu, KYB Corporation

This study deals with the FSI (Fluid Structure Interaction) analysis of paper helicopter using the general purpose explicit FEM code LS-DYNA. The phenomenon of dynamic deformation of wing shape during the fall was clarified. As for the fall time, the experiment of and the calculation were corresponding well. This simulation model is useful for the education of quality engineering.

Wednesday, December 1 13:55-

[Press forming 1]
Robust Design of Stamping Die for High-Tensile Steel

Dr.Tomoharu Shimizu, Iwate University

The use of high strength High-tensile steel is rising steadily. But the stamping die for such high-tensile steel must modify, because of the material characteristics unevenness. Robust design, called Taguchi Method, is useful method for the solution of such problems, because the first aim of the robust design is reduction of the influence for the various kinds of unevenness. In this report, the method of the robust design is applied for the stamping die for high-tensile steel. The validity shows by stamping simulations.

Wednesday, December 1 14:55-

[Automotive]
Development of WorldSID Dummy Model - A Joint Project of German Car Manufacturers

Dr.Uli Franz, DYNAmore

The paper presents the performed steps to develop a state of the art finite element model of the WorldSID 50% Dummy. It describes the definition of appropriate validation tests, the milestones, and the results of the project. It also outlines an assessment scheme for model quality used during dummy development. The presented work is in cooperation with the PDB members: Audi, BMW, Daimler, Porsche and Volkswagen.

Wednesday, December 1 15:20-

[Automotive]
Advanced Technologies Related to Crash Simulation for Optimum Combination of Structure and Material

Dr.Shigeru Yonemura, NIPPON STEEL CORPORATION

The increases in computational capacity and body-materials diversity have been enhancing the requirement for more accurate crash simulation. For this purpose, simulation method for the fractures of materials using stress based forming limit diagram (FLSD) was proposed, based on experimental and theoretical investigations. The effect of forming limit curve under two-stage strain paths for 590MPa high strength steel has been investigated by determining forming limit diagrams after tensile prestrain. The result shown that stress based forming limit curves are path independent, while strain based forming limit curves are strongly path dependent. Furthermore, a new fracture prediction method for steel sheet structure in stamp-crash coupling simulation is developed using FLSD.

Wednesday, December 1 15:45-

[Automotive]
Construction of SAFE: Crash Analysis Model Construction System

Mr.Tomokazu Suzuki, FUJI HEAVY INDUSTRIES LTD.

In recent years, challenges of development period shortening, knowledge sharing, error reduction in calculation, and product quality equalization have emerged. To respond to these challenges, an automation system was constructed by working on the automatic setting of crash boundary conditions. This automatic system was realized with the collaboration of JSOL and the customization of PRIMER and the system has been applied to development. This paper introduces the automatic system and the effects of its application to development.

Wednesday, December 1 14:55-

[Press forming 2]
Practical use development of Truss-core panel.

Mr.You Gotou, Shiroyama Industry

The truss-core panel is a panel of the high rigidity at the light weights that Dr. Nojima of Kyoto University. And we can realize large weigh-reduction when we apply this to a building, a railroad carriage, and a car. The fabric is a combination of the panels which arranged projections of the tetrahedron shape in the cross-stitch, but, as for the forming of the tetrahedron shape, it is difficult so that problems such as a crack and disorder of the shape, and so on. We carried out forming simulation and I understood a flow and the panel thickness decrease and improve the die and was able to really form a panel to be able to use.

Wednesday, December 1 15:20-

[Press forming 2]
Multiscale Approach for CFRP Composite Simulation by JSTAMP/NV & DIGIMAT

Mr.Noriyo Ichinose, JSOL Corporation

In the automotive industry , CFRP is becoming the essential material because of the lightweight property and the stiffness. Some automotive companies try to use the CFRP instead of metal panel in low price vehicle. A press forming is used to reduce the production time and cost of CFRPparts. In the metal forming simulation, we have 15 years experience and are developing the integrated forming simulation system named "JSTAMP/NV" To adapt JSTAMP/NV to "CFRP forming simulation", we made the simple interface between Digimat and JSTAMP/NV. In this presentation, I will introduce JSTAMP/NV with Digimat and show some examples for CFRP forming simulation. Furthermore the crush simulation considering the forming effect will be shown.

Wednesday, December 1 16:25-

[Keynote Speech]
Development of Next Generation Human FE Model Capable of Organ Injury Prediction

Mr.Tsuyoshi Yasuki, Toyota Motor Corporation

In this study, a next generation human body FE model has been developed to predict internal organ injury. The model represents the geometry of organ parts, their location in a living human body and their connections to surrounding tissues. The features of each organ part were taken into account in modeling, so that compressive material was assumed for hollow organs while incompressive material was applied to solid organs. Besides the major organ parts, other soft tissues such as membranes and fatty tissues were also incorporated in order to simulate relative motions among organs. The entire model was examined comparing its mechanical response to that in the literature. The study confirmed that the force-deformation response of the torso against anterior loading showed a good correlation with that of tested subjects.