带空穴柱形装药壳体破片爆炸驱动特性

In order to study the explosion driving characteristics of shell fragments driven by cylindrical charge with cavity and reveal the mechanism of the influence of shaped charge structure on the initial velocity of shell fragments,the explosion driving process and initial velocity distribution of shell fragments under different cavity cone angles are studied through the numerical simulation. The initial velocity distribution function of shell fragment along the axial direction is fitted by analyzing the rarefaction wave propagation path,velocity loss coefficient and fragment acceleration process. The relative error between the calculated and simulated results is less than 15%. The results show that the earlier generation of rarefaction wave and the decrease in cross-section ratio of mass of charge to shell are the main factors contributing to the decrease in the initial velocity of fragments. The initial velocity of the fragments near the non-detonation end decreases with the decrease in the cone angle of cavity and the increase in the cone top height of cavity. The rarefaction wave reflected from the non-detonation end is an approximately planar wave and is at a certain angle to the cavity surface. The instant when rarefaction wave reaches shell is linearly and positively correlated with the axial position of the shell. The cross-section ratio of mass of charge to shell has a quadratic function relationship with k,where k is the ratio of the distance from the cross section to the non-initiating end to the height of cavity cone top. The velocity loss coefficient decays exponentially with the decrease in k. The research can provide a useful reference for the overall structural design, material selection and structural optimization of anti-armour and anti-personnel composite warheads and the deformable fragment warhead with cavity charge structure.