Simulation on initial velocity and structure dynamic response for fuel dispersion

In order to study dispersal characteristics for sector cross-section structure, the processes of fuel dispersion and shell breakage driven by central explosive were simulated by LS-DYNA code, and the simulated and experimental results were compared. The variation of fuel velocity with time was obtained. The effects of explosive types, groove spacing and groove depth on dispersion were analyzed. Results show that the maximum dispersal velocity of fuel shows up at 180° direction, while the earliest time for the maximum dispersal velocity is at 0° direction. Compared with RDX, HMX exacerbates the extension of shell breakage due to higher explosion pressure and velocity. Thus, dispersal velocity of fuel reduces by 18% averagely. As for location of central explosive, lower dispersal velocity of fuel and radical breakage of shell would occur when central explosive deviates overly from the center of shell cross-section. With 40 mm groove spacing and 2 mm groove depth, simulation reveals fewer shell stress concentration and higher dispersal velocity (283 m·s^-1) at 180° direction.