Research on the Velocity Characteristics of Fragments in Structures with Inner Liner Charge Driven by Implosion

In order to investigate the fragment driving characteristics of lined explosive structures under implosion, a study was conducted on lined fully prefabricated square fragment explosive structures, and the dynamic expansion fragmentation and fragment acceleration laws of lined explosive structures under detonation-driven were obtained. Based on the velocity time history curve of fragments, the staged acceleration characteristics of fragments were identified, predominantly during the driving stage governed by the detonation shock wave and the subsequent gas pushing stage of the detonation product. By analyzing the Hugoniot curve, shell motion equation, and energy conservation equation, two stage fragment velocity calculation formulas were derived. The corresponding curves were fitted employing the ODE method integrated within Matlab. The results revealed that the loading trend of fragment velocities across various stages aligned harmoniously with existing literature, and the fragment velocity outcomes exhibited excellent agreement with numerical simulations, verifying the rationality of the staged fragment velocity calculation method. The results revealed that the loading trend of fragment velocities across various stages aligned harmoniously with existing literature.