斜め衝撃荷重を受ける車両用薄肉構造部材の衝撃圧潰特性

概要

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Recently, there are strict requirements for measures against the crushing of automobiles with a lightweight structure. In the frontal collision of an automobile, the energy of the impact of the automobile is absorbed by deformation of mainly thin-walled structural members. In this paper, the impact collapse behavior of hexagonally shaped thin-walled structural tubes under an oblique impact load is numerically analyzed using the finite element method. This paper also shows the energy absorption characteristics for the difference in thickness and rib reinforcements. As a result, the oblique load angle affects the collapse behavior of the member, which leads to collapse by progressive buckling or by bending. Furthermore, the initial compressive load and energy absorption characteristics are influenced. In the case of collapse by progressive buckling, the energy absorbing performance under oblique impact load is effectively improved by rib reinforcement of the member. However, this is not effective in the case of collapse by bending.