| With the need of modern protection ability,materials with better bulletproof properties will be selected and studied gradually.Silicon carbide(SiC)ceramics are widely used in bulletproof area due to their large hardness,Ultra-High Molecular Weight Polyethylene(UHMWPE)laminate is also widely studied because of its great toughness,but the ballistic performance of composite armore combination of hard/ soft is rarely mentioned.The different shapes of ceramics have significant influence on the bulletproof capability of ceramic composite armor,and the ballistic performance of different panels to ceramic composite armor has not been discussed.This paper mainly adopts the effect of ceramics with different geometry on the ballistic performance of ceramic composite armor is studied,and the effect of different panels on the ballistic performance of ceramic composite armor will be discussed in this paper,and the process of their bulletproof will be studied in detail.Firstly,two main kinds of bulletproof materials are introduced in this paper,they are high hardness SiC ceramics and flexible material UHMWPE,respectively,the sintering process of SiC ceramics is also introduced,in this paper,SiC ceramics are selected as pressureless sintering.UHMWPE plate is laminated by uni-directional(UD)cloths for heat pressing,the laying number of UD bases on the thickness required by UHMWPE.At the same time,the making process of ceramic composite armor plate and the necessary experimental device are also introduced in detail.Secondly,in order to study the ballistic performance of composite armor combined different geometric mosaic SiC ceramics with UHMWPE plate,four kinds of armored plates with different structures are designed and fabricated for the penetration tests,they are separate composite laminates,cylindrical ceramic armored panels,hexagonal ceramic armor plates and square ceramic armor plates,respectively,the front plate of cylindrical ceramics is roughly divided into three impact zones.The protective effect of various armored plates on the bullets and the failure mode of the armor plates after high speed impacted are obtained through the experiment.And on the basis of theory,the anti-projectile mechanism of the ceramic composite armors is revealed,and the specific processes of projectile penetrating the ceramic composite armor plate is also get.The experimental results show that the bulletproof capability of the single UHMWPE plate is almost not strong when it is shot by the Armor Piercing projectile,for cylindrical ceramic composite armor,when the bullet hits a single cylindrical ceramic,the armor plate has the greatest resistance to the bullets;the resistance of hexagonal ceramic composite armor to bullets is stronger than the cylindrical ceramic composite armor,the square ceramic composite armor has the best anti-projectile effect,and the bullet can't penetrate this armor plate.Thirdly,the ballistic characteristics of ceramic composite armor with different front-panels are studied,the specimens were titanium alloy/ceramic/UHMWPE,aluminum alloy/ceramic/UHMWPE,composite laminate/ceramic/UHMWPE,and woven fabric/ceramic/UHMWPE.The ballistic performance of ceramic composite armor with different front-panels is studied,and the failure modes of all the armor plates under the high-speed impact of the bullet are further analyzed.The anti-projectile mechanism of the ceramic composite with different front-panels is revealed.The experimental results show that the ceramic composite armor with TC4 panel has the best anti-projectile effect,it is not suitable for using UHMWPE as the panel of ceramic composite armor.At the end of this paper,the numerical simulation of square ceramic armor plate and titanium alloy/ceramic/UHMWPE armored plate is carried out by AUTODYN finite element software,and the numerical simulation results are compared with the experimental results to verify the reliability of the numerical simulation and the validity of the selection of material parameters. |
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