Fragment spatial distribution of prismatic casing under internal explosive loading  

作　　者：Tianbao Ma Xinwei Shi Jian Li Jianguo Ning 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing,100081,China

出　　处：《Defence Technology（防务技术）》2020年第4期910-921,共12页Defence Technology

基　　金：supported by the National Natural Science Foundation of China(Grant No.11822203and 11702026)。

摘　　要：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.

关 键 词：Fragment spatial distribution Prismatic casing Internal explosive loading Numerical fitting formula Marker-point weighted method 

分 类 号：TJ410[兵器科学与技术—火炮、自动武器与弹药工程]