A Ceramic/Metal Composite Armor With New Back Plate Structure

Against the background of the demand for light armored vehicles to against the armor-piercing projectiles,this research aims to solve the existing problems of a new type of ceramic composite armor structure,and a ceramic/metal composite armor with a new back plate structure was designed.Ballistic experiment and numerical simulation were combined to study the penetration process and anti-ballistic mechanism of the new composite armor.The research process and the shining points are as follows:（1）Based on the numerical simulation of the bulletproof mechanism of the aluminum alloy grooved target plate,this research proposed two new types of backplate structures for the aluminum alloy grooved back plate and the cut back plate for ceramic composite armor,and the design scheme of the back plate was determined through the comparison experiment.Numerical simulation shows that:under certain conditions,the aluminum alloy grooved target plate can break along the groove during projectile penetration and produce a plug,which increases the kinetic energy consumption of the core;the plug block has a yaw effect on the projectile and reduces the projectile follow-up penetrating ability;the groove structure can reduce the stress and strain disturbance at the periphery of the groove.Comparison experiment shows that:the aluminum alloy grooved back plate and the ceramic composite target plate of the cutting back plate can achieve the elastic resistance of a new type of ceramic composite armor structure and achieve the anti-ballistic mechanism.Besides,the cutting back plate structure is better than the groove back plate structure.（2）Considering the influence of factors such as the cutting method and size of the back plate,the planar shape and size of the structural unit,and the thickness matching of the panel and the back plate,this research conducted a ballistic experiment of a 12.7mm deflagration projectile penetrating an aluminum alloy cutting back plate ceramic composite target plate.The result shows that the aluminum alloy cutting back plate ceramic composite target plate has good single-shot and multi-shot resistance performance,and the ballistic principle of a new type of ceramic composite armor structure is realized,and its anti-elastic performance is achieved;The size of the back plate is prone to plug damage and improves the energy consumption of the back plate.Increasing the size of the structural unit will reduce the probability of plug failure.When the thickness of the 14mm Al₂O₃ ceramic/5mm2A12 aluminum alloy is matched,the elastic resistance of the composite target plate is the best,the edge of the weak area has achieved effective ballistic resistance.（3）Based on the ballistic experiment,this research carried out a numerical simulation study on the ballistic resistance mechanism and performance of the aluminum alloy cutting back plate ceramic composite target plate.The result shows that the numerical simulation is in good agreement with the experiment;the penetration process can be divided into three stages:panel crushing,back plate deformation and destruction,and projectile penetration into the complete plate;the main anti-ballistic mechanism for cutting the back plate composite target includes energy dissipation mechanism and yaw effect.When the impact point is the center area,the target plate mainly depends on the energy dissipation mechanism to play the ballistic resistance;the eccentric area serves both the energy dissipation mechanism and the yaw mechanism,and the edge area and the joint area mainly rely on the yaw effect to play an important role;and compared with the integral back plate composite target,the cutting back plate composite target board has no obvious delamination phenomenon between the back panel and the back panel,which is more conducive to resisting multiple strikes.