Experimental research on the mechanism of high-velocity projectile penetrating into reinforced concrete target

In order to study the high-speed penetration effect of the structural projectile on the reinforced concrete target, tests of structural projectile with high velocity penetrating into reinforced concrete target were carried out by using a 35mm-caliber ballistic gun as a launching tool, and the penetration velocity of the projectile ranges from 1030 m/s to 1520 m/s. The test data of the deformation and failure form, remaining length and remaining mass of the projectile were obtained through detailed measurement of the recovered projectile. The macro-damage of the targets, penetration depth and crater size of the target body were also obtained. Based on the experimental data, the changes of the projectile structure response, penetration of the dimensionless crater depth, and dimensionless crater diameter with the penetration velocity were analyzed. According to the deformation and destruction of the projectile during the penetration process, the penetration depth and penetration mechanism change with penetration velocity were analyzed, and the partition of the penetration velocity was discussed. The results show that, in the penetration velocity ranges from 1030 m/s to 1390 m/s, the head of the projectile is eroded, and the degree of erosion increases with the increase in penetration velocity, and the penetration depth increases approximately linearly with the penetration velocity. When the penetration velocity is in the range of 1390−1480 m/s, the head of the projectile is severely eroded, and the penetration depth decreases as the penetration velocity increases. When the impact velocity is greater than 1480m/s, the projectile body is severely broken, and the penetration depth decreases sharply as the penetration velocity increases. According to the damage characteristics of the structural projectile during high-speed penetration, the penetration velocity is divided into rigid body penetration zone, quasi-rigid body penetration zone, eroded body penetration zone and broken body penetration zone, which can provide a reference for the structural design of ground-penetrating projectile.