深水环境中水下爆炸冲击波作用下圆柱壳动态响应的数值模拟研究

DYNAMIC RESPONSE OF CYLINDRICAL SHELL SUBJECTED TO UNDERWATER EXPLOSION SHOCK WAVES IN DEEP WATER

基于通用有限元程序ABAQUS,运用静力分析和动力分析相结合的研究方法,对深水环境中圆柱壳在水下爆炸冲击波作用下的动态响应进行了数值模拟研究,分析了深水中圆柱壳动态响应的影响因素,研究了圆柱壳的破坏随深度而变化的规律。研究结果表明:在同样的冲击波载荷作用下,圆柱壳的毁伤程度随着所处深度的增大而逐渐加重;爆距不变时,不同爆心方位所对应的圆柱壳的响应不同;预应力的存在使圆柱壳毁伤程度有所增加,并且预应力对圆柱壳响应的影响与爆心方位有关;能够导致圆柱壳破坏的炸药质量随深度增加而迅速减小;圆柱壳在浅水中和深水中的破坏机制不同,前者是由于冲击波的作用,而后者是冲击波和静水压力联合作用的结果。

Numerical investigation was carried out on a cylindrical shell subjected to underwater explosion shock waves in deep water by ABAQUS software package. The simulation included the static state analysis by ABAQUS/Standard to gain the prestresses in shell and the dynamic analysis by ABAQUS/Explicit to gain the dynamic response, and the analysis result of the former was imported to the latter as its initial conditions. The calculation results indicate that the depth of the shell situation, the orientation of the standoff point and its prestresses all influence the dynamic response of cylindrical shell; the acceleration response of the cylindrical shell at low frequency in deep water is less than that in shallow water; the explosive mass necessary to rupture the cylindrical shell decreases rapidly when the depth increases; the rupture of the cylindrical shell is due to material failure as a result of local stress concentration induced by shock waves in shallow water, while the large deformation induced by shock wave combined with hydrostatic pressure is the main reason to rupture the cylindrical shell in deep water.