衝撃吸収エネルギーおよびピーク荷重を考慮した柱状シェル構造材の多目的最適設計

抄録

This paper deals with a multi-objective optimization problem of crushing energy absorption of basic box-type column structures. This paper has tried to show the influence of dimensions of polygon, thicknesses of outer wall and inside diaphragms to the absorbing behaviors and the crushing peak force by the CAE simulation using LS-DYNA. Then, this design problem is formulated as a multi-objective design optimization problem considering the maximization of total absorbing energy by crushing of column, and the minimization of crushing force peak during energy absorption. The response surface approximation technique is adopted to get the Pareto optimum with small numbers of CAE simulation of crushing. The suggested formulation is applied to solve the box-type shell structures with diaphragm and hexagonal-type shell structures with diaphragm. Finally, it is found that the shell structures with diaphragm, which connects the center of cross section and midpoint of each edge of side wall, show better energy absorbing performance in comparison with the structures with diaphragm connecting the center of cross section and the apexes of side walls.