A kind of metal-confined ceramic composite in which the matrix alloy is 6061 aluminum and the diameter of Al_2O_3 ceramic ball is 6 mm was fabricated by squeeze casting.The ballistic efficiency factor of the composite material was obtained through 12.7 mm and 30 mm armor piercing experiments and the anti-ballistic mechanism and damage mechanism were investigated.The results show that the mass efficiency of the metal-confined ceramic composite armors with average density about 3.3-3.4 g/cm3 resisting against 12.7 mm and 30 mm armor piercing bullets exceeds 2.2 and 1.7 respectively.A concentrated shock load on the surface of composite materials might be tranfered to a locally uniform load due to the impacts among ceramic balls.On the other hand, an array arranged alternately by flexible 6061 aluminum ball and hard Al_2O_3 ceramic ball in composite materials could disperse energy and increase the shock-wave reflection, resulting in the improvement of the ballistic performance of composite target.The energy absorbing mechanism reveals that the innovated armor is able to protect against projectiles, together with the benefit of weight saving.
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