Simulation analysis of the effect of conical cap on the piercing performance of projectile

Abstract

To study on the effect of conical cap on the piercing performance of projectile( Φ 150mm) when penetrating three-interval-layer steel target ( target thickness: 20mm+20mm+20mm, the center of distance between adjacent targets is 1.5m ), the FEA model of penetrating performance of the projectile with conical cap was built by using Ls-dyna, and the attitude change law, velocity change law and impacting acceleration change law of projectile in the process of piercing the targets were analyzed under the different impact velocity(500m/s, 600m/s, 700m/s, 800m/s) and impact angle(0°, 25°, 50°) condition. The simulation results show that: with the increase of impact velocity and impact angle, the time of the conical cap separating from the head of projectile and breaking is earlier, and the breakage of the cap is also more severity. Under the same impact angle and different impact velocity condition, the maximum axial acceleration variation of projectile penetrating into each target is inconsistent, which is closely related to the separation of the cap from the projectile and the breaking of the cap. After the cap separating from the head of projectile, the cap will impact on the target firstly, which can reduce the axial acceleration when the projectile penetrates the target. Under the same impact velocity condition, the residual velocity of the projectile decreased with the increase of impact angle; and under the same impact angle condition, the velocity change after the projectile penetrates the target gradually decreases with the increase of the impact velocity of projectile. The amount of kinetic energy change of projectile increases with the increase of impact velocity of the projectile, that is to say, the higher of the impact velocity, the more of the kinetic energy loss in process of projectile penetrating target.