水下爆炸气泡载荷在加筋板塑性变形中的作用

Effect of underwater explosion bubble on plastic displacement of stiffened plates

水下爆炸产生的冲击波载荷和气泡载荷都会对水中结构产生毁伤作用。为研究水下爆炸气泡载荷在加筋板塑性变形挠度中所占的比例,利用通用有限元软件Abaqus/Explicit对加筋板模型在水下爆炸载荷作用下的动态响应进行了一系列数值仿真。载荷计算采用了Geers-Hunter模型,材料本构采用了Johnson-Cook模型,将部分计算工况与试验结果比较,两者吻合较好。通过分析计算结果可以看出在气泡载荷在加筋板塑性变形中的比重主要受爆距影响,爆距越小,所起的作用越大。所以,在水下近场爆炸计算中,气泡载荷引起的塑性变形不容忽视。

Both shock wave and bubble load from underwater explosion can destroy structures.In order to study plastic displacement of stiffened plates subjected to underwater explosion bubble,the dynamic plastic responses of a model were simulated by using FEM software Abaqus/Explicit.The underwater explosion load was calculated by use of the Geers-Hunter model.The material was simulated using the Johnson-Cook model.The simulation results were coincident with the experimental ones.The results showed that the effect of the underwater explosion bubble on the plastic displacement of the stiffened plates relates to the standoff distance;in the near field explosion,the effect of the bubble is more important;therefore,the plastic displacement induced by bubble load can't be neglected in the near field explosion.