Study on the influence of attack angle and incident angle on ballistic characteristics of projectiles penetration into thin concrete targets

Experiments of a 30 mm ogive-nose projectile penetration into two layers of concrete targets are carried out to study the characteristics of projectile oblique penetrating a finite thickness concrete target. A high-speed camera was used to record the projectile deflection, velocity, and trajectory in the process of penetration. Vernier caliper and ruler were used to measure the size of the front and rear craters. The parameters of the perforation damage of the concrete slab and the ballistic parameters and trajectories were obtained. The influence law of attack angle and incident angle on the characteristics of perforation damage of concrete slab, attitude deflection during the perforation process, deflection angle after penetration, and ballistic trajectory are analyzed and studied. The experimental results show that there is a phenomenon of secondary deflection in the penetration process. With the increase of incident angle, the phenomenon of secondary deflection is more obvious. The initial attack angle inhibits the occurrence of the phenomenon of secondary deflection. With the increase of the attack angle, the inhibition effect is more significant. With the increase of the incident angle, the deflection angle after penetration increases gradually. Compared with the incident angle, the initial attack angle has a greater influence on the deflection angle behind the concrete target. The initial attack angle promotes the increase of the deflection angle after penetration when the initial attack angle is the same as the incident angle. When the initial attack angle is opposite to the incident, a small initial attack angle can inhibit the increase of the deflection angle after penetration, but a large one becomes the main factor affecting the deflection angle after penetration. The larger the initial attack angle, the larger the deflection angle after penetration. © 2022 Explosion and Shock Waves. All rights reserved.