Research On Protection Technology Of A Certain Type Of Silicon Nitride Ceramic Composite Armor

In order to improve the safety and mobility of light and high-mobility vehicles,it is necessary to improve the body bulletproof performance and reduce the quality of armor,so it is very important to study the light composite armor.This paper takes the Si₃N₄ toughened ceramic as the research object to carry out the structural matching design and lightweight analysis of ceramic composite armor.Firstly,Si₃N₄ ceramics were subjected to dynamic and static compression experiments and fly-plate impact experiments.The JH-2 constitutive model parameters of Si₃N₄ ceramics were obtained by fitting.Then,the protection standards and test standards of ceramic armor at home and abroad are summarized.On this basis,the depth of penetration（DOP）experiments of Si₃N₄ ceramics are carried out to study the protection efficiency and thickness efficiency.Establish a penetration finite element simulation model,obtain an accurate finite element simulation model by comparing the numerical simulation and experimental results,which provided technical support for subsequent research.Research the basic structure and anti-ballistic mechanism of ceramic composite armor,select the appropriate back plane material,and analyze the effect of the gap and the number of layers of the composite armor on the protection effect at different incident angles of the projectile,and the effect of the shape and size of the ceramic sheet on the protection effect,so as to determine the protection scheme under different incident angles of projectile.In order to defend against the target of7.62 mm API and 12.7 mm API,the protection scheme was optimized.Through the NSGA-II multi-objective genetic algorithm,the Pareto solution set that satisfies the target is obtained,and the NBI algorithm is used to process the solution set to obtain the optimal design plan.Obtained the minimum areal density plan that meets the protection requirements under multiple protection angles.Use air gap to optimize the design of the protection of large inclination angle,which greatly reduces the armor surface density and achieves the goal of light weight.Finally,some optimization schemes are verified by experiments and the feasibility of the scheme is verified.