Research on the influence of inner liner on the Fragmentation Performance of Charge structure

Abstract

To investigate the influence of inner liner on the fragmentation performance of prefabricated fragment charge structures, both experimental and numerical simulation studies were carried out on semi-prefabricated shell charge structures with liner, alongside numerical simulation studies on fully prefabricated fragment charge structures incorporating liner layers. The dynamic expansion and fragmentation processes, gas leakage behavior, and fragment velocity patterns of lined charge structures under explosion-driven were elucidated. Based on the experimental and numerical simulation findings of the semi-prefabricated shell charge structure with liner, the effects of liner material and thickness on the fragment velocity of the semi-prefabricated charge structure were explained. It was revealed that the thickness of the liner had a more significant effect on the fragment velocity than the material, exposing the staged acceleration characteristics of fragments and the role played by the liner in the fragment acceleration process. The numerical simulation study was conducted on the fully prefabricated spherical fragment charge structure with liner, and the acceleration characteristics of the explosion-driven fully prefabricated fragment charge structure were derived through the velocity-time history curve. The influence of the liner on the fully prefabricated fragment charge structure was also ascertained. Furthermore, the effects of liner material and thickness on the fragmentation velocity of semi-prefabricated explosive structures were investigated. It was found that the liner can increase both the gas leakage radius and fragmentation velocity. Notably, the velocity of the 10# steel liner charge structure can be increased by approximate 10% compared to unlined explosive structures, and the influence of liner material on fragmentation velocity is more significant than that of thickness.