Numerical Analysis And Factors Influencing Of Ceramic/Metal Composite Armour Against Penetration

Ceramic/metal composite armor was taken attention by military enterprises both at home and abroad, because of the high strength, the high hardness, the low density and the anti-penetration performance. The process of the ceramic/metal composite armor opposed to penetration is very complex, there are many factors affect it. It is difficult to obtain regularity conclusion for the traditional experimental and analytic method. However, ANSYS/LS-DYNA was used to research the penetration process and mechanism in the article, and the following analysis were study about the AD95ceramic/steel composite target opposed to penetration of flat-cylindrical-steel bullet.Firstly, the anti-penetration process of ceramic/metal composite target opposed to flat-cylindrical-steel bullet was divided into eight stages according to the characteristics of the process, and the eight stages are the initial phase of opening pit, the ceramic crack propagation stage, the ceramic conoid formation stage,the ceramic conoid movement and maceration stage, the projectile impact metal backboad stage, the steady penetration phase, the throughout stage and the completely through stage.Secondly, the composite target with the surface density of76.83kg/m opposed to penetration of flat-cylindrical-steel bullet with the speed of800m/s was studies. when the thickness configuration of ceramic panel and metal backplane is10mm:5mm, the anti-penetration performance of the composite target is the best.Thirdly, the size of the ceramic conoid is associated with the shape and speed of the bullet, in the analysis, the size of the ceramic conoid becomes biggest when the speed of the bullet is1100m/s. The anti-penetration performance of the composite target opposed to blunt bullet is better than that of cuspidal. Compared with homogeneous target, the ricochet phenomenon is more likely to occur in the composite target, as long as the penetration angle is greater than60degree, the ricochet phenomenon would emerge.Fourthly, the anti-penetration performance of the composite target can be effectively improved through the adding surface constraints of steel plate. When the thickness of the surface constraints steel plate is1.5mm, the maximize energy dissipation mechanism of the metal backplane can emerge. While the adding aluminum foam layer can also bring the improvement of the anti-penetration performance, but the change is very small.Last, the anti-penetration performance of the composite target is one-way, the energy dissipation mechanism of the metal plate as backplane is six times of that as panels. In the condition of the same surface density, the anti-penetration performance of the multilayer ceramic/metal composite target does not increase with the increasing number of layers. The thickness configuration and the surface constraints are more important for the anti-penetration performance of the composite target.