Experimental study and numerical simulation of explosives containing B/Al in underwater explosions

摘要

To research the effect of content of Boron/Aluminum compound powder on energy output property of metallized explosives in underwater explosion, three HMX-based explosives (PF-I, PF-2, PF-3) containing BIAl were designed and prepared. The underwater explosion experiments of specimens with size of 0100x105mm were carried out, six overpressure sensors were installed at the position of 2m, 3m, 4m, 5m, 6m and 7m away from specimen center on one side to measure the shock wave pressure, and two overpressure sensors were installed at the position of 3m and 4m away from specimen center on the other side to measure the bubble pulsation period, then the shock wave energy, bubble energy and total underwater explosion energy of three explosives were calculated. In the meantime, the underwater explosion process was simulated by finite element program AUTODYN. Results show that, the numerical simulation method by AUTODYN to simulate underwater explosion has high accuracy, the total energy error doesn't exceed 0.425MJ/kg. Among the three explosives, the maximum shock wave energy, bubble energy and total energy are produced by PF3 specimen with 20% content of BIAl compound powder, the total energy of which reaches to 6.404MJ/kg. Under the detonation of HMX, the combination effect of BIAl is obviously. The boron powder is derived to burn by aluminum powder burning, which releases more combustion heat and improves the total energy of underwater explosion by bubble pulsation.