Study On Al₂O₃/TC4/Kevlar Multilayer Lightweight Composite Armor And Its Penetration Resistance

Under the condition of modern war,the world’s military powers are committed to the development of the military unit which is more flexible,the attack performance of anti-armor weapon is more and more efficient and three-dimensional.In order to meet the requirements of the maneuverability and protection of the protection system in the battlefield,stronger and lighter composite armor has become a research focus in armor protection filed.The excellent performance of composite because of its designability is known as one of the hotspots of research at home and abroad.A lightweight multilayer composite armor is designed in this paper.The penetration process and damage mechanism of composite armor by 12.7mm projectile penetrating and the optimization design of armor configuration are mainly studied.The main contents of this paper are as follows:(1)Based on the understanding of ceramic,metal,fiber reinforced high performance protective properties of matrix composite materials,A lightweight multilayer composite armor is prepared by Al2O3,TC4,Kevlar.According to test standard of GJB/59.18-1988,four groups of multilayer composite armor were test at 820 m/s speed under vertical impact by 12.7 mm armour piercing projectile.Through the comparative analysis of the failure mechanism of armor material,while the transition of TC4 plate and TC4 backplane thickness ratio is 4:3,the Anti-penetration performance is the best,and the surface density is only 99.3kg/m2,the protective coefficient reaches 2.49.The goal of light and high strength is realized.(2)A simulation model of composite armor structure is built by ANSYS/Autodyn.The effectiveness of the numerical simulation method is verified by contrasting the damage characteristics of each layer with experimental result.The projectile speed,acceleration,energy absorption curve,the ceramic injury chart and transition plate Mises stress distribution chart were obtained by Autodyn,which lays the foundation for the analysis of composite armor penetration mechanisms.Research shows that the penetration is mainly divided into four stages:the no-load phase,hard collision stage,erosion stage,penetration back stage;Through the Analysis of this,damage evolution and failure process of the ceramic plate are related;Stress distribution of transition plate is related with the ceramic cone,Increasing the area of the ceramic cone can effectively reduce the backplane stress.(3)The penetration process of projectile velocity,acceleration,and the energy absorption curves of the numerical simulation are obtained.The ceramic plate and the metal plate structure parameters on ceramic/metal/fiber/metal composite amour anti-penetration performance characteristics are analysed.Emphatically the influence of the anti-penetration performance of armor structure in different ceramic plate and the metal plate structure parameters are discusses.Research shows that the ceramic thickness can optimize target anti-penetration performance,but can not delay the breakup time of ceramic;The anti-penetration performance of composite armor is the best,while Al2O3/TC4/Kevlar structure is used;When the transition TC4 plate and TC4 backplane thickness ratio is 4:3,the penetration performance is the best.