Numerical study on the damage behavior of concrete target influenced by penetration velocity and target properties

The influence of initial penetration velocity and target properties on the damage behavior of concrete target by kinetic energy (KE) projectiles are studied numerically. Numerical models of penetration at different velocities were established, the failure of concrete and the law of the impact at different initial velocities ranging from 950 m/s to 1500 m/s on the damage behavior of concrete target is obtained. Damage process of concrete target slabs with different strengths and thicknesses under various impact load was carried out and the relationships between the damage behavior and the target strength ranging from 35 MPa to 95 MPa and the thickness ranging from 1 m to 2 m were obtained. Combination with the experiment results demonstrates that, the descent rate of the initial velocities increase as the initial velocities were improved. The higher the strength of the target, the less the residual velocity decrease caused by increasing the strength of the target. Under the condition of the same thickness increase amplitude, higher totally thickness of the targets results in greater penetration resistance. Furthermore, the overload peak value and the oscillation period of the impact load are positively related to the initial velocity and target thickness. With the increase of penetration depth, the impact load presents a first dramatic increase, then gradual decrease trend with obvious oscillations.