多弹丸协同冲击下柱壳装药响应特性数值模拟及试验

Numerical Simulation and Experimental Study on the Response Characteristics of Cylindrical Shell Charge under Collaborative Impact of Multiple Projectiles

为探究多弹目交汇条件下多爆炸成形弹丸(Multiple Explosively Formed Projectiles, MEFP)协同冲击柱壳装药响应特性,在冲击起爆试验基础上,采用理论计算和数值仿真相结合的方式,开展不同密集度MEFP群束协同冲击柱壳装药的响应特性分析研究。实验结果表明:MEFP群束密集度λ及柱壳壁厚h均会对响应特性产生影响;当λ相同时起爆用时t随h增大而同步增加,3种壁厚起爆用时分别增大2.00、2.50、1.88倍,当λ为8和5.33时,起爆用时t随h呈线性增长规律;当h相同时起爆用时t随λ减小同步增加,4种密集度MEFP群束起爆用时分别增大2.66、3.60、3.25、2.50倍,且当柱壳壁厚h为13 mm时起爆用时t随λ同样呈线性变化规律。MEFP群束对柱壳装药的协同增强作用在h为13 mm时发生分化,当λ为16和8时,MEFP群束对目标的冲击起爆用时均早于任意单EFP作用,最多分别提前约41.22%、8.61%,协同增强作用明显;当λ为4时,MEFP群束对柱壳装药起爆能力逐渐与单EFP趋同,协同增强作用减弱。

The response characteristics of cylindrical shell charge under the collaborative impact of multiple explosively formed projectiles(MEFPs)are studied.The response characteristics of cylindrical shell charges with different densities are analyzed by using a combination of theoretical calculation and numerical simulation based on impact detonation tests.The results indicate that the density of MEFPs,λ,and the thickness of cylindrical shell wall both affect the response characteristics.Whenλis the same,the initiation time t increases synchronously with the increase in the thickness of cylindrical shell wall.The initiation time for the three wall thicknesses is increased by 2.00,2.50,and 1.88 times,respectively.Especially whenλis 8 and 5.33,the initiation time shows a linear growth pattern;when h is the same,the initiation time t increases synchronously with the decrease inλ.The initiation time for the four spacings is increased by 2.66,3.60,3.25,and 2.50 times,respectively.Moreover,when h is 13 mm,the initiation time also shows a linear pattern.The synergistic enhancement effect of MEFPs on cylindrical shell charges is differentiated when h is 13 mm.Whenλis 18 and 8,the impact initiation time of MEFP on a target is earlier than that of any single explosively formed projectile(EFP),with a maximum advance of about 41.22%and 8.61%,respectively,indicating a significant synergistic enhancement effect.Whenλis adjusted to 4,the initiation ability of MEFPs on the cylindrical shell charges gradually converges with that of a single EFP,and the synergistic enhancement effect weakens.