ひずみ速度依存性を考慮した薄肉円筒の軸方向衝突における平均荷重

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In this paper, the average load for circular tubes subjected to axial impact is investigated, based on finite element analysis. It is found that the load for a strain rate sensitive material can be predicted from that for a strain rate insensitive material by taking into account of the modified yield stress and the plastic hardening coefficient. Here, these parameters can be calculated using the average strain rate at the apex of the second wrinkle from the fixed end of a tube during folding. Also, the average strain rate is found to be a function of a ratio of impact velocity and tube radius, and an approximate technique for evaluating the average strain rate is proposed. Moreover, based on our numerical results, an approximate equation for evaluating the average load is proposed, and checked the validity of the approximation.
2010-10-25