Effect of grooves on the double-nosed projectile penetrating into plain concrete target

Abstract

At present, it is one of the important ways to improve the penetration performance by changing and optimizing the projectile shape. In order to study the effect of grooved surface on projectile penetrating plain concrete target, a double-conical-nosed projectile with different grooves was proposed in this paper. Specifically, three types of projectile, including straight groove (STG), spiral groove (SPG) and no groove (NOG), were compared and analyzed respectively by using DEM-FEM numerical simulation and field experiment. The results show that during penetration, the role of grooved surface is mainly reflected in two aspects. One is that the interface pressure between the projectile head and concrete is reduced, and other is that the grooves of projectile afterbody can hold a part of the broken particles, which balance the transverse load of the projectile and stabilized the terminal trajectory. For plain concrete target, both straight and spiral grooved surface are beneficial to improve the penetration ability of the projectile. Compared with the spiral groove structure, the straight groove type is more beneficial to improve the penetration depth of trajectory.