水下爆炸冲击波作用下自由环肋圆柱壳动态响应的数值仿真研究

运用大型商业有限元程序MSC.DYTRAN数值模拟了水下爆炸冲击波作用下自由环肋圆柱壳的非线性动 态响应。采用一般耦合算法(generalcoupling)模拟流体与结构的耦合效应,计算中考虑了材料的应变率强化效应,几何 非线性以及结构的初始缺陷的影响,计算结果与实验吻合较好。比较了肋骨和肋间壳板在迎爆面,侧爆面和背爆面处的 中面有效应力和应变,分析了壳体在三个不同部位的破坏机理。最后比较了计算中考虑应变率效应与否对壳体最终变 形的影响。

Nonlinear Transient Dynamic Response of Free-free ring-stiffened Cylindrical Shell Subjected to Underwater Explosion Shock Wave

Numerical investigation were carried out on free-free ring-stiffened cylindrical shell subjected to underwater explosion shock wave using MSC.DYIRAN. General coupling was used to simulate the fluid-shell interaction. Strain rate effect ,geometric nonlinearity and initial geometric imperfection were considered. Numerical result agrees well with that of experimet .The equivalent plastic strain in middle plane of the nearest element,the mid element and the remote element both on rib and mid-rib were compared. The primary damage mechanisms of these elements were analyzed. The comparison between permanent deformations considering strain rate effect or not was presented.