船用加筋板在水下接触爆炸作用下动态响应数值分析

Dynamic Response Researches of Ship Stiffened Plate Structure Subjected to Underwater Contact Explosions

针对船用加筋板复杂结构在接触爆炸载荷作用下的动态响应,采用高动态非线性有限元程序LS-DYNA对六种加筋板结构进行数值模拟,分析了结构的变形损伤。在此基础上分析了板架最大塑性应变出现的位置、有效应力、加速度等动态参数随时间的变化曲线。结果表明加筋的设置方式对板架的变形有一定影响,但加筋都能够协调和减小板架变形,增强其抵抗爆炸冲击波的能力,使结构偏于安全,对舰船抗爆设计具有一定的参考价值。

In order to study the dynamical responses of ship stiffened plate structure under underwater contact explosions,the FEM code LS-DYNA was used to discuss the problem which had six stiffened plate structures.The stiffened plate＇s distortion and the size of crevasses in the numerical simulation were analyzed.The position where the maximal plastic strain appeared,the curve of effective stress and acceleration were described.It was revealed that the deformation of stiffened plate was different with the position of the stiffener,but the stiffener could harmonize and reduce the deformation of plate,and the whole structure would be more safety when it was subjected to explosions.So the research could be help to the design of ship＇s explosive resistance.