支承在劈尖上的圆环在撞击下的刚塑性动力响应

DYNAMIC PLASTIC RESPONSE OF A RING SUPPORTED BY A WEDGE TO AN IMPACT ON ITS TOP

本文对底部支承在劈尖上的圆环顶部承受刚性块撞击的塑性动力响应问题作了小变形分析,讨论了“质量比”和“能量比”对撞击点的位移的效应,并给出了数值算例。结果表明动态塑性变形主要局限于撞击点附近的区域,因此动态变形模式是与静态塑性破坏机构显著不同的。

The dynamic response of a circular ring, which is supported at its bottom by a wedge and impinged by a rigid mass on its top, is analyzed on the basis of rigid-perfectly plastic idealization and the small deformation formulation. The effects of the 'mass ratio' and 'energy ratio' on the deflection at the impinged point are shown by numerical results. The results also indicate that the dynamic plastic deformation is mostly localized in the region near the impinged point, and this makes the dynamic mode quite different from the static collapse mechanism.