Abstract: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.