惰性芯体物性对阶梯形空腔装药结构爆轰驱动的影响

Influence of inert core stuffing's physical properties on the impact of detonation driving of scalar hollow charge

为研究惰性芯体物性对轴向阶梯形空腔装药结构爆轰驱动的影响规律,分别加工并装配了空腔内填充LY12铝、尼龙1011和无填充物三种技术状态的战斗部并进行了静爆实验,采用脉冲X射线成像测试技术获得了破片平均速度和飞散场形态;应用非线性动力学计算软件LS-DYNA,采用ALE算法进行了数值计算,分析了三种惰性芯体物性对破片场飞散形态、冲击波压力和破片初速的影响规律。结果表明:惰性芯体材料的冲击阻抗较主装药的冲击阻抗越大,对冲击波压力的影响越明显,作用于壳体表面的初始压力越大,主装药推动破片做功的能力越强,破片的速度越大,且惰性芯体物性的影响随着芯体半径的增大而增大。

In the present work,to find out how the inert core＇s physical properties influence the detonation driving of the axial scalar hollow charge,we fabricated three warheads separately stuffed with air,nylon 1011 and aluminum 12,carried out a static explosion test using the pulse X-ray imaging testing technology,and obtained the average velocity of the fragment field and the characteristics of the velocity distribution.Also,using the LS-dyna software and the ALE algorithm,we carried out numerical simulation to analyze the influences of the physical properties of three kinds of inert core＇s stuffings on the fragment field＇s shape,shockwave pressure,and initial velocity.The results show that the detonation driving is related with the shock resistance and dynamic stiffness of the stuffing：if the shock resistance of the stuffing is greater than the main charge,the impact on the shock wave pressure is more obvious;the greater the initial pressure on the shell surface,the greater the power of the main charge to drive the fragment,and the faster the fragment＇s velocity;and the influence of the inert core＇s physical properties become greater as the inert core or cavity radius increases.