Anti-penetration Characteristics Of Mosaic Ceramic Composite Armor

Ceramic composite armor has received great attention and been vigorously developed in various countries,and the spliced ceramic composite armor composed of multiple small-sized ceramic units is widely used.In order to further study the anti-penetration characteristics of spliced ceramic composite armor against bullet penetration,the anti-bullet penetration test and numerical simulation research of spliced ceramic composite armor against bullet penetration were carried out.The influence law and influence mechanism of that penetration location,the side length and thickness of the ceramic element,the ceramics with anisotropic structure and the anti-penetration performance of target plate with different backplates are analyzed emphatically.The areas with weak anti-penetration performance at the edge of the square ceramic element are distributed in the shape of a circle.For the 7.62 mm bullet penetrating the target,the weakest anti-penetration performance appears at the distance of 3mm from the edge,and the residual kinetic energy of the projectile penetrating through the target plate is higher than the central area by 36.3%.When the edge of the ceramic element is penetrated,the cone angle and volume of the ceramic cone as well as the bulge diameter of the backing plate will be reduced,which is the main reason for the weakening of the anti-penetration performance of the edge.The width of the weak area of the ceramic element and the reducing amplitude of the anti-penetration performance increase with the increase of the thickness of the ceramic element.The edge length of the ceramic element does not affect the width of the armor weak area.Increasing the edge length of the ceramic element can improve the anti-penetration performance at the center of the ceramic element and the joint of the elements.The arc-shaped platform can effectively improve the penetration resistance of the weak area of the ceramic element and increase the probability of the deflection of the projectile.The numerical model of 7.62x51 mm penetrator penetrating spliced ceramic composite armor is established and its effectiveness is verified.The ballistic test and numerical simulation are combined to study the anti-bullet performance of ceramic composite armor with different back plates.The research results show that: under the same backing plate surface density and ceramic panel support,the use of aluminum alloy backing plate can improve the dissipation capacity of the ceramic to the kinetic energy of the projectile;but the bulge deformation caused by the impact of the aluminum alloy backing plate is more serious;when the same position is penetrated,the bulge height reaches more than two times of the UHMWPE backing plate.