Oblique perforation of rigid projectile into multi-layer spaced reinforced concrete slabs

Abstract

The projectile usually penetrates the target obliquely rather than vertically. To investigate the effect of a multi-layer spaced concrete target on the trajectory of a projectile, oblique perforation experiments were conducted by utilizing an ogive-nosed projectile to penetrate three layers of spaced concrete slabs. The initial velocities of the projectile in the test ranged from 354 m/s to 679 m/s, and the obliquity angle was 30°. The trajectories of the projectile during the whole perforation process were obtained through high-speed photography images, and the failure pattern of each target was recorded. The Kong-Fang model was used to simulate the oblique trajectory characteristics and it was verified from three aspects: the residual velocity, ballistic trajectory and the failure pattern of the target plates. Based on the validated numerical model, the factors affecting ballistics were discussed, including velocity, angle of attack and obliquity. The results indicated that the trajectory change becomes more significant as the number of slabs increases when the projectile penetrates the multi-layer spaced target. The angle of attack has a great influence on the trajectory of the projectile, and by changing the angle of attack, the trajectory of projectile can be made close to the initial ballistic line during the oblique penetration.