多层板架结构在2次攻击下的动态响应分析

Dynamic response analysis of multilayer grillage structure under two attacks

为研究多次爆炸作用下舰船舷侧多层防护结构的破坏变形情况,借助于大型有限元分析软件AN-SYS/LS-DYNA对该结构在2发武器攻击下的动态响应进行模拟,分别分析了炸药相对加强筋位置不同的3种模型,在武器同时攻击和先后攻击下的破坏情况,描述了钢板的破口大小、最大位移、有效应力以及塑性区的范围等动态参数。对2种攻击情况进行了分析比较,结果表明,破损结构在遭受第2发武器攻击时产生的破坏更大,因此,2发武器先后攻击更为理想。

To study the damage and deformation of ship multilayer defensive structure under several attacks, the numerical simulation of the dynamic response process using ANSYS/LS-DYNA software was conducted under two attacks. The deformation of the model with different dynamite sites subjected to two attacks simultaneously and successively was analyzed. The bulk of the crevasse, the maximal deformation, the effective stress and the range of plastic area were described. Results of the two attacks were compared. It is revealed that the destruction of the imperfect structure under the second attack is greater, so that two successive attacks are better.