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

Abstract

In order to study the high-speed penetration effect of a structural projectile on a reinforced concrete target, tests of structural projectiles 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 projectiles 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 projectiles were obtained through detailed measurement of the recovered projectile. The macro-damage of the targets, the penetration depth and crater size of the target bodies 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 penetration velocity were analyzed. According to the deformation and destruction of the projectiles 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 heads of the projectiles are 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 heads of the projectiles are severely eroded, and the penetration depth decreases as the penetration velocity increases. When the impact velocity is higher than 1480 m/s, the projectile bodies are severely broken, and the penetration depth decreases sharply as the penetration velocity increases. According to the damage characteristics of the structural projectiles 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.