偏心起爆战斗部随机破片数值仿真

 利用AUTODYN-3D软件和基于Mott破片分布理论的Stochastic随机破碎模型，对破碎型偏心起爆战斗部的破片形成进行了三维数值模拟，对比分析了3种起爆方式下自然破片的飞散特性以及偏心起爆时不同起爆半径随机破片的飞散特性。结果表明：偏心单点和偏心多点起爆在目标区域产生的破片数比中心点起爆分别提高了37.12%和62.86%，且破片质量小，破片的利用率可以提高4.01%~6.08%；偏心单点和偏心多点起爆的平均速度增益为25.95%和28.37%；对于偏心起爆，随着起爆半径的减小，目标区域的随机破片数减小，轴向速度和径向速度也随之减小。

Numerical Simulation of the Dispersion of Random Fragments under Asymmetrical Initiation

Using AUTODYN-3D and the Stochastic random fragmentation model which based on the Mott's fragment distribution law, the scattering properties of the warhead fragments are numerically simulated and analyzed under three different ways of initiation including center point initiation, asymmetrical single point initiation and asymmetrical multi-point initiation. The results show that compared with center point initiation, the numbers of random fragments in the target area produced under asymmetrical single point initiation and asymmetrical multi-point initiation are increased by 37.12% and 62.86%, the availabilities of the fragments are improved by 4.01%-6.08%, and the average velocity gains are 25.95% and 28.37% respectively. Furthermore, the effects of the initiation radius on the scattering properties of the random fragments are obtained under asymmetrical initiation. It is shown that the numbers of fragments in the target area, the axial velocity and radial velocity are all reduced with the initiation radius increasing.