Influence of Rock Layer Thickness on the Penetration Resistance of a Composite Target

Abstract

To describe the influence of rock thickness on the penetration resistance of rock-concrete composite targets, a three-dimensional model was simulated using the nonlinear dynamic simulation software LS-DYNA. The penetration of four composite targets with rock-concrete thicknesses of 10-20, 20-20 cm, 30-20 and 40-20 cm by a projectile at a target angle of 75 degrees is investigated in this study. A damage cloud diagram of the target plate is obtained, and the curves of penetration speed and overload in the X and Y directions of the projectile with time are analysed. During penetration, the rock and concrete layers tend to restrain each other from destroying the target’s back and surface, and the projectile directly enters the tunnel area of the concrete layer from the tunnel area of the rock layer. When the ratio of rock thickness to shot length is less than 1.5, the attitude of the projectile after penetrating the composite target is relatively stable.