柱状装药预制破片缩比战斗部爆炸冲击波和破片的作用时序

针对柱状装药的周向预制破片战斗部,结合无量纲分析方法和爆炸驱动理论,确定了影响破片和冲击波相遇位置的关键参数,给出了由缩比战斗部推广预测原型战斗部爆炸产生的破片冲击波作用时序的方法。采用ANSYS/LS-DYNA有限元软件进行数值模拟,对比验证了理论分析和数值试验结果,分析了战斗部缩比比例对冲击波和破片作用时序的影响。结果表明:缩比模型与原型战斗部爆炸产生的破片和冲击波的相遇位置之比和相遇时间之比主要取决于两模型的质量比,在不考虑破片速度衰减时,两模型中载荷相遇位置之比和相遇时间之比等于其质量比的0.33次方。受破片速度衰减影响,该方法仅适用于质量缩比不小于0.2的模型。

Blast Wave and Time Sequence of Prefabricated Fragments for Scaled Warhead with Cylindrical Charge

In order to explore the influence of the scale effects on the timing of fragmentation and shock wave,the key parameters affecting the location of fragmentation and shock wave are determined by the dimensionless analysis and explosion theory for the prefabricated fragment warhead.This paper proposes a method to predict the timing relationship of the prototype warhead fragmentation and blast wave by the scale ratio warhead,and establishes the model of the warhead under different scale ratios.The numerical simulation is carried out with ANSYS/LS-DYNA finite element software.Based on the theoretical and numerical results,we analyze the scale effects of the warhead on the timing of shock waves and fragmentation.The results show that the ratio of the encounter position of fragments and shock waves produced by the scaled model and the prototype model depends on the mass ratio of the two models.Without considering the velocity attenuation of fragments,the ratio of the encounter position in two models is equal to the 0.33 power of the mass ratio.Due to the effects of fragmentation velocity attenuation,the method is applicable to models with a mass reduction ratio of not less than 0.2.