基于物质点法的船体板架结构高速侵彻毁伤模式研究

本文通过数值模拟的方法研究了截卵型弹体冲击下921A钢板的毁伤模式。 跟以往试验进行对比，发现数值结果与实验结果吻合良好。 在3种不同工况下，剩余速度与实验结果吻合良好，误差小于5%。随着弹着点位置的变化，加筋板的失效模式发生变化。击中靶板中心时，加强筋发生撕裂，目标板在左右两侧产生对称的花瓣型破坏模式。 随着弹着点位置的偏移，加强筋的撕裂程度逐渐减小，最后仅仅发生塑性应变。并且目标板上的破坏不再对称，左侧板的动态响应从花瓣破坏变为小面积断裂，最后仅保留塑性变形。右侧板始终产生花瓣型失效模式，但花瓣的数量和形式始终在变化。结果表明，物质点法可以很好地应用，并为今后舰船穿透研究提供参考。

Different failure modes during the high-velocity penetration on the ship plate structure through material point method

In this paper, the numerical simulation of 921A steel target under the impact of truncated-ogive projectile is studied. The numerical results agrees well with the experimental results. Under three different conditions, the residual velocity is in good agreement with the experimental results, and the error is less than 5%. With the change of the impact point position, the failure modes of the stiffened plate target plate is described in detail. First, the stiffener tears and the failure by symmetrical petalling occurs in target plate on the both left and right side. With the change of the impact point position, the tearing degree of stiffener decreases gradually, and the stiffener deforms plastically only. The petals on target plate are no longer symmetrical, and the dynamic response of the left target plate transforms from petalling failure to small break, and only plastic deformation remains at last. The right target plate always produced petalling failure mode, but the number and form of petals always change. The results show that material point method can be applied well, and it can provide some reference data for the future research of ship penetration.