近场水下爆炸载荷对舰船结构的局部毁伤特性

Local Damage Characteristics of Ship Structure by Near Field Explosion Load

主要采用任意的拉格朗日-欧拉(ALE)方法的LS-DYNA软件,对舱段结构在水下近场爆炸与水下接触爆炸情况下的毁伤特性进行研究.为验证该方法的有效性,首先运用该方法对TNT炸药在水下爆炸产生的冲击波峰值进行模拟,将模拟得到的仿真值与经验公式的计算值进行对比,从而验证该方法的有效性.运用该方法对平板水下接触爆炸实验进行验证,将模拟结果与试验结果进行对比,进一步验证ALE方法的有效性.最后,采用ALE方法分别对不同结构型式的舱段在水下近场爆炸与水下接触爆炸进行数值模拟,研究不同结构型式舱段结构在不同工况下的毁伤特性,定量分析破口大小与结构毁伤模式.

In this paper,the arbitrary Lagrangian-Eulerian(ALE)method was used to study the damage characteristics of the cabin structure under underwater near-field explosion and underwater contact explosion.The method was firstly used to simulate the peak value of the shock wave generated by the TNT explosive in underwater explosion,and the simulated value obtained by the simulation was compared with the calculated value of the empirical formula to verify the effectiveness of the method.Then the method was used to verify the underwater contact explosion experiment of the plate,and the simulation results were compared with the experimental results to further verify the effectiveness of the ALE method.Finally,the ALE method was used to simulate the submarine near-field explosion and underwater contact explosion of different structural types.The damage characteristics of different structural types of subdivisions under different working conditions were studied.