深水爆炸作用下耐压圆柱壳的稳定性研究

Research on Stability of Pressure Cylindrical Shell Under Deep Water Explosion

采用有限元软件ABAQUS,基于国军标标准建立典型耐压圆柱壳有限元模型,研究其在深水水下爆炸作用下的毁伤特性。首先计及静水压力的影响,采用特征值屈曲和非线性屈曲方法对耐压圆柱壳的稳定性进行分析,在此基础上计算水下爆炸载荷作用后的耐压圆柱壳模型的剩余强度,并分析药量、爆距等因素对结构剩余强度的影响。研究表明:静水压力作用下,耐压圆柱壳的失稳会沿着初始变形处展开,且内环肋圆柱壳的承载能力优于外环肋圆柱壳;水下爆炸载荷一旦对耐压圆柱壳造成塑性毁伤后,其结构稳定性会大幅度降低。

The finite element model of typical pressure cylindrical shell is established based on the national military standard by using the finite element software ABAQUS,and its damage characteristics under deep-water underwater explosion are studied.Firstly,considering the influence of hydrostatic pressure,the stability of pressure cylindrical shell is analyzed by eigenvalue buck⁃ling and nonlinear buckling methods.On this basis,the residual strength of the pressure cylindrical shell model under underwater explosion load is calculated,and the effects of charge amount,explosion distance and other factors on the residual strength of the structure are analyzed.The results show that under hydrostatic pressure,the instability of pressure cylindrical shell will expand along the initial deformation,and the bearing capacity of inner ring ribbed cylindrical shell is better than that of outer ring ribbed cy⁃lindrical shell.Once the underwater explosion load causes plastic damage to the pressure cylindrical shell,its structural stability will be greatly reduced.