摘要
Abstract
In order to investigate the resistance of a specific lightweight ceramic/fiber composite armor(boron carbide ceramic/carbon fiber/aramid/ultra-high molecular weight polyethylene)against impacts from 12.7 mm armor-piercing incendiary projectiles,experiments were conducted to obtain the ballistic limit velocity of the single-shot 12.7 mm armor-piercing incendiary projectiles penetrating lightweight ceramic/fiber composite armor.Finite element model of the ceramic composite armor penetrated by bullets was established using LS-DYNA.The algorithm of finite element and smoothed particle hydrodynamics(FEM-SPH)was employed to calculate the ballistic limit velocity and analyze the response characteristics of the ceramic composite armor during the penetration process.The simulated ballistic limit velocity results show an error of less than 5%compared to the experimental results,verifying the rationality of the model.Based on this,the effective protection area distribution of the target plate,as well as its ability to resist repeated impacts from dual 12.7 mm bullets and influencing factors,were further studied using numerical simulation method.The results indicate that the elastic resistance performance of the ceramic composite armor within the plane is inconsistent and can be roughly divided into central,eccentric,and marginal zones,influenced by the impact point location.The eccentric zone exhibites superior overall penetration resistance performance compared to the central zone.Meanwhile,it experiences greater backplate deformation,with an average increase of approximately 30%,and evident interlayer delamination of the composite material.The marginal zone,due to the inability to form a complete ceramic cone,exhibites the poorest penetration resistance performance and failes to provide effective protection.The ability of the target plate to withstand repeated impacts from dual bullets is influenced by the distance between impacts.When the bullets impacted the target simultaneously and the distance between impacts is not less than 4 times the projectile diameter,the target plate could resist repeated impacts from dual bullets.When the bullets impacted the target successively and the distance between impacts is not less than 6 times the projectile diameter,the target plate could resist repeated impacts from dual bullets.关键词
陶瓷复合装甲/弹道极限速度/FEM-SPH/有效防护区域/重复打击Key words
ceramic composite armor/ballistic limit velocity/FEM-SPH/effective protection area/repeated attack分类
军事科技
