セル構造体を用いた衝撃吸収部材のエネルギー吸収特性

抄録

In order to ensure the safety of passengers in the case of an accident, crashworthiness members are mounted on the car. Currently, tubular members are used for this impact absorbing member, but there is a problem that the load at the initial stage of crushing becomes extremely high. Therefore, we propose to use aluminum cellular structure which simulates wood structure as a new impact absorbing member which replaces the conventional tubular member. Impact crushing analysis using the finite element code LS-DYNA^Ⓡ and impact crushing experiments were performed for cellular structures, and we examined how cell shape and array affect energy absorption characteristics. First, impact crushing experiments were performed for the cellular structure. When comparing the result of the analysis based on the experimental conditions, the results of both were very close. Then we created five different models with a lot of small holes which have two kinds of radius. As a result of analyzing them, the load-displacement curves were greatly different even for the same volume, and as the difference between the radii of the two small holes became larger, the crushing load increased. But in that case, the model was liable to buckle. It was also found that the shape of the side of the model also affects the load-displacement curve.