OS0910 薄肉円筒の動的軸圧潰(衝撃工学とその応用,オーガナイズドセッション)

概要

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A numerical simulation based on FEM is undertaken in order to clarify the influence of the axial impact velocity V_0 on the crushing behavior of cylindrical tubes subjected to an axial impact. In general, the initial peak stress u1 for a tube of a strain rate sensitive material is higher than that of a stain rate insensitive material. It is found that the initial peak stress σ_l 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 σ_Y and the plastic hardening coefficient E '_h. Here, σ_Y and E'_h can be calculated using the the strain rate ε|_l at the apex of a wrinkle when σ_l generates.Also, the strain rate ε|_l is a function of a ratio of V_0 and tube radius R, and based on numerical results, an approximate technique for evaluating ε|_l and σ_l is proposed and checked the effectiveness of the approximation.
2009-07-24