Fragment spatial distribution of prismatic casing under internal explosive loading

Non-cylindrical casings filled with explosives have undergone rapid development in warhead design and explosion control. The fragment spatial distribution of prismatic casings is more complex than that of traditional cylindrical casings. In this study, numerical and experimental investigations into the fragment spatial distribution of a prismatic casing were conducted. A new numerical method, which adds the Lagrangian marker points to the Eulerian grid, was proposed to track the multi-material interfaces and material dynamic fractures. Physical quantity mappings between the Lagrangian marker points and Eulerian grid were achieved by their topological relationship. Thereafter, the fragment spatial distributions of the prismatic casing with different fragment sizes, fragment shapes, and casing geometries were obtained using the numerical method. Moreover, fragment spatial distribution experiments were conducted on the prismatic casing with different fragment sizes and shapes, and the experimental data were compared with the numerical results. The effects of the fragment and casing geometry on the fragment spatial distributions were determined by analyzing the numerical results and experimental data. Finally, a formula including the casing geometry parameters was fitted to predict the fragment spatial distribution of the prismatic casing under internal explosive loading.     

目标运动要素误差对尾流自导鱼雷自导开机距离的影响

尾流自导鱼雷自导开机距离设置直接影响到鱼雷是否能可靠捕获尾流,开机距离的设置通常考虑尾流自导装置自适应调整及目标运动要素误差的影响,射击态势的影响因素不容忽视但未引起足够重视。通过分析计算不同射击态势下目标运动要素误差对尾流自导鱼雷直航段航程的影响,得出了射击态势对尾流自导鱼雷自导装置开机距离影响的程度及规律。