舰船防护结构穿甲后爆炸的数值仿真分析

为了研究冲击爆炸作用下舰船防护结构的破坏情况,将该结构简化为多层板架结构,借助于有限元程序LS-DYNA中的ALE算法,同时考虑穿甲和爆炸的作用,对其在穿甲后爆炸荷载作用下的非线性动态响应过程进行仿真分析,描述了钢板的破口形状、破口半径及板上单元等效应力随时间变化的情况,并与舷外接触爆炸对结构的破坏情况进行比较.结果表明穿甲后爆炸能对舰体内部造成破坏,因此它是一种比较理想的反舰攻击方式.

Numerical analysis of ship defensive structure under explosions after penetration

The damage of ship defensive structure subjected to impact and explosion was studied adopting the ALE algorithm of LS-DYNA,the structure was reduced to the multi-layer grillage structure. Considering both of explosion and penetration,numerical simulation was conducted on the nonlinear dynamic response process,in which the structure was subjected to explosions after penetration. The shape and radius of crevasse as well as the distribution of effective stress were described. Through comparing the results with those of the structure under contact explosion,it is revealed that the explosion after penetration can destroy the inner structure of ship. So it is a kind of perfect anti-ship attack.