Symposium on Ceramic Armor Materials by Design held at the Pac Rim IV International Conference on Advanced Ceramics and Glass, Hawaii, United States Of America, 4 - 08 November 2001, vol.134, pp.103-110
High quality alumina ceramic tiles, backed with semi-infinite aluminum blocks were ballistically tested with armor piercing 7.62 mm projectiles. The failure mechanism, ballistic efficiences and fragmentation behavior of ceramics were investigated under impact loading conditions. The thickness and projectile velocity were essential. Ballistic efficiency was affected by the thickness and projectile velocity. Upon impact, radial, cone and lateral cracks form and disintegrate the ceramic tile. A ceramic conoid-zone within the innermost cone crack interacts with the projectile. In the present study, ballistic efficiencies that quantify the normalized performance of ceramic against the impacting projectile, have been found to be a function of the projectile velocity and ceramic tile thickness. High values of ballistic efficiencies were achieved for thinner ceramic tiles and for higher impact velocities. These effects of projectile velocity and ceramic tile thickness on the ballistic efficiency are thought to be extremely important when making merit ratings between armor ceramics tested at various velocities or thickness.