並列化計算による動的陽解法FEMを用いた構造解析に関する研究

概要

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Dynamic collapse behaviors of ship structures and automobiles have been recently studied from the viewpoint of crashworthiness for safety of people and environment of the earth. Dynamic collapse behaviors of various structural elements have to be investigated and the information of characteristics of post-buckling behavior and absorbing energy are to be accumulated and systematized for designing appropriate structures for demanded crashworthiness. Dynamic crashing problem is very nonlinear problem including large deformation and dynamic effect. Therefore dynamic explicit finite element analyses are usually used. But very small time increment has to be used for the simulation to satisfy Courant condition for stable calculation. It means enormous time steps and calculation time are needed. Explicit FEM analysis is fortunately suitable for parallel computation because of the independency of each D.O.F. in each calculation step. In the present study paralleled numerical program has been developed using MPI libraries and dynamic collapse behavior of square cylinder has been calculated by parallel computing with multiple PCs. Effectiveness of the paralleled simulation is shown. And the large elastic and elasto-plastic behaviors of the cylinder have been investigated numerically and discussed.
社団法人日本船舶海洋工学会の論文
2004-08-31