Study On Mechanisms Of Laterally Confined Ceramic Composite Target Against Projectiles

The process and mechanism of laterally confined ceramic composite target impacted by long rod and 30mm semi-AP projectile (30mm projectile for short) were investigated by experiment and numerical simulation. Great emphasis is laid on the ballistic mechanism and efficiency of laterally confined ceramic composite target. The main contents and innovative work include:(1) The DOP ballistic experiment of composite target against long rod was studied by numerical simulation. The main mechanism of laterally confined ceramic composite target against long rod was investigated. The results show that the restriction of the radial movement of ceramic tile and the enhancement of the radial pressure in the tile in the process due to the lateral confinement improve the ballistic performance of composite target against long rod.(2) The influence of the thickness of confinement and the diameter of ceramic tile on the ballistic efficiency of laterally confined ceramic composite target against long rod was investigated and the optimal configuration was obtained. As far as the long rod in the impact velocity range 1000m/s~1400m/s, the lateral confinement is needed when the ratio of tile diameter and projectile diameter is below 13, and the optimal matching between tile diameter and confinement is that the thickness of confinement is 10mm in the ratio of tile diameter and projectile diameter range 9~12.(3) The experiment and the numerical analysis show that the penetration process of laterally confined ceramic composite target under 30mm semi-AP projectile involves three stages: the first stage, the ceramic cone forming; the second stage, the projectile penetrating the ceramic tile and the third stage, the residual projectile impacting the backing plate.(4) The reasonable matching of laterally confined ceramic composite target against 30mm semi-AP projectile was investigated by numerical simulation. Compared to the mechanism of no-confined ceramic composite target, the mechanism of laterally confined ceramic composite target against 30mm semi-AP projectile is embodied in the first two stages in the penetration process in which the restriction of the lateral movement of the ceramic tile, the enhancement of the lateral pressure in the tile, the delay of crack of the ceramic tile, the increase of mass loss of projectile and the increase of the dissipation of the backing plate improve the ballistic performance of composite target. The optimal thickness of confinement is 8mm in the current configuration, and the laterally confined ceramic composite target has better ballistic performance when the ratio of the lateral dimension of ceramic tile and the projectile diameter is below 3.67.