Penetration of Hemispherical Projectile Into the Three Layer Targets with Different Materials and Layouts

Abstract

In this paper, the penetration of a hemispherical projectile into the targets with three adjacent layers (without air gap) with different arrangement and materials has been studied. To study the set parameters, some ballistic tests as well as FEM simulations had done and the numerical results compared with experimental ones. While defining ballistic limit for the projectile-target system, the effect of layers arrangement sequence and material in their ballistic operation was perused. The result of the experiments showed that if the aluminum plates (harder material) are placed in the two first layers and CU (softer material) is placed in the third layer, the resistance against penetration will have the maximum value. Experimental results show that by decreasing the initial velocity of projectiles, velocity downfall is increased while the amounts of absorbed energy do not change significantly. The projectile velocity has a significant effect on the fracture mode. Increasing the velocity make the fracture accomplish in the Plugging mode while decreasing the velocity get the fracture to take petaline mode.