縦衝撃を受ける有限長棒の動的挙動　Ｉ　　ひずみプラトー形成条件

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  • Dynamic behavior of a finite length bar subjected to longitudinal impact. (1st report Appearance conditions of a strain plateau)
  • タテショウゲキ オ ウケル ユウゲンチョウボウ ノ ドウテキ キョドウ 1 ヒ

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The present paper deals with the dynamic behavior of an elastic-plastic bar of finite length colliding longitudinally with a rigid wall. The dynamic, plastic deformation of a finite length bar and the appearance conditions of a plastic strain plateau adjacent to the impacted end are examined on the basis of the strain-rate dependence theory for plastic wave propagation. It is shown that the asymptotic formation of a strain plateau in a finite length bar is governed by the magnitude of strain-rate sensitivity, the impact velocity and the length of the bar. In addition, the distribution of plastic strain along finite length bars is found to gradually approach a certain profile with increasing length of the bars. The experimental results on annealed pure aluminum bars of various lengths have shown to agree well with the theoretical predictions.

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