为研究某型轻质陶瓷/纤维复合装甲(碳化硼陶瓷/碳纤维/芳纶/超高分子量聚乙烯)抗 12.7 mm穿甲燃烧弹打击的能力,试验得到了单发 12.7 mm穿甲燃烧弹侵彻轻质陶瓷/纤维复合装甲的弹道极限速度.借助LS-DYNA软件建立枪弹侵彻陶瓷复合装甲的有限元模型,采用有限单元-光滑粒子耦合算法(FEM-SPH)计算了其极限穿透速度,分析得到了侵彻过程中陶瓷复合装甲的响应特性,仿真弹道极限速度结果与试验的误差小于 5%,验证了模型的合理性.在此基础上进一步研究了靶板的有效防护区域分布和抗双发枪弹重复打击的能力及其影响因素.结果表明:陶瓷复合装甲平面内抗弹性能并不一致,受弹着点位置影响可大致分为中心区、偏心区和边缘区.偏心区整体抗侵彻性能优于中心区,但是背板变形量更大,平均增加了约 30%,复合材料层间分层破坏明显;边缘区由于不能形成完整的陶瓷锥,抗侵彻性能最差,不能形成有效防护.靶板抗双发枪弹打击的能力受着靶间距的影响,当枪弹同时着靶时,若着靶间距不小于 4 倍弹体直径,靶板可以抗双发枪弹重复打击;当枪弹先后着靶时,若着靶间距不小于 6 倍弹体直径,靶板可以抗双发枪弹重复打击.
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.