针对火箭助飞式器材高速入水所带来的结构强度问题,文中利用有限元软件ANSYS/LS-DYNA建立了弹体入水冲击有限元模型,壳体材料采用PLASTIC_KINEMATIC非线性塑性材料模型,水和空气采用Gruneisen状态方程,采用多物质ALE算法对弹体入水的结构力学响应进行了仿真计算。通过仿真分析发现,头部结构在入水受到撞击时壳体结构发生了开放性破坏现象。考虑到头部尺寸的限制,在不改变头部壁厚的情况下,通过增加内部支撑结构来加强壳体强度。通过分析得出,优化后的结构强度大为改善,满足了设计要求,提高了弹体的抗冲击性能。

To solve the problem of structure strength caused by rocket-assisted equipment entering into water at high speed, the finite element model was established using the finite element software Ansys/Ls-dyna in this paper. The simulation of structure response to highspeed water entry was studied with ALE muti-material group algorithm using the plastic_kinematic nonlinear model for shell material and the gruneisen equation of state for water and air material. The simulation result shows that the head structure will be damaged when impact on the water. Considering the limit of internal space, the method of adding the internal supporter without changing the thickness was used to reinforce the shell strength. Through the analysis, the optimized structure strength is improved obviously to meet the design requirement and provide reference for the anti-impact design of the projectile.