充液格栅结构抗射弹冲击数值模拟研究

为研究充液格栅结构抗射弹冲击性能,基于经验证的充液箱体抗射弹冲击动力学建模方法,建立典型充液格栅结构抗射弹冲击有限元模型,分析射弹初速度、充液比例、流体液面压力以及流体黏性等对冲击过程中射弹速度衰减变化规律、形成的空腔形态以及流固耦合作用下格栅结构前、后壁板变形的影响。结果表明:射弹动能损失与充液比例基本没有关系,但与射弹初速度、液面压力和流体黏性与射弹动能损失正相关;后壁板的变形程度大于前壁板的变形,壁板变形程度与充液比例、射弹速度和液面压力正相关;射弹冲击下,充液比例越高、射弹初始速度越高、液面压力越高、流体黏性越大,充液格栅结构越容易发生失效。

Numerical Simulation of Projectile Impact of Liquid-filled Grid Structures

Based on validated dynamic modelling method of anti-projectile impact of liquid-filled structure, the finite element model of typical liquid-filled grille structure was established to study the impact performance of liquid-filled grille structure. And the effects of initial velocity, filling ratio, fluid pressure and fluid viscosity on the attenuation of projectile velocity, the change of cavity shape and the deformation of front, back panels of the grid structure were analyzed. The results show that the kinetic energy loss of projectile is not related to the filling ratio, but positively related to the initial velocity of projectile, the liquid pressure and the fluid viscosity. The deformation of the back panel is larger than that of the front panel. And the deformation of the wall plate is positively related to the filling ratio, the projectile velocity and the liquid pressure. Under the impact of projectiles, the higher the liquid filling ratio, the higher the initial velocity of the projectile, the higher the liquid surface pressure and the greater the viscosity of the fluid, the more likely the failure damage occurs of the liquid-filled grille structure.