关键词: 破片战斗部, 空穴装药, 数值分析, 初速分布

Abstract: In order to study the explosion driving characteristics of cylindrical charge shell fragments with cavities and reveal the influence mechanism of cavity charge structure on the initial velocity of shell fragments, numerical simulation was carried out on the explosion driving process and initial velocity distribution of shell fragments under different cavity cone angles. By analyzing the sparse wave propagation path, velocity loss coefficient and fragment acceleration process, the initial velocity distribution function of the shell fragment along the axial direction is fitted. The error between the calculation results and the numerical simulation results is less than 15 %. The results show that the earlier generation of rarefaction wave and the decrease of cross-section ratio of mass of charge to shell are the main factors for the decrease of initial velocity of fragments. The initial velocity of the fragments near the non-detonation end decreases with the decrease of the cavity cone angle and the increase of the cavity cone top height. The reflected rarefaction wave from the non-detonation end is an plane wave approximately and has a certain angle with the cavity surface. The instant when rarefaction wave reaches shell is linearly 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 the ratio k between the distance between the cross section and the non-initiating end and the height of the cavity cone top. The velocity loss coefficient decays exponentially with the ratio k decreasing. The research can provide a useful reference for the overall structural design, material selection and structural optimization of the anti-armour and anti-personnel composite warhead and the deformable fragment warhead with cavity charge structure.

Key words: fragment warhead, shaped charge, numerical analysis, velocity distribution