Shock wave features of underwater explosion of explosives with metal shell

Experiment and numerical simulation were performed by using 1 kg cylindrical aluminized explosive cased by 6 mm thick steel and aluminum shells, respectively. The results show that the steel shell can enhance the impulse, shock wave energy and decay time compared with the aluminum shell. And the influences of the steel shell thickness were analyzed. With the increase of the thickness, the shock wave were enhanced and then weaken, and there was a lag-effect for the peak pressure of the shock wave. For a given mass of explosive, there lies an optimum shell thickness for enhancing the shock wave peak pressure. For different mass, the mass ratio of shell to explosive is an important parameter for estimating the underwater explosion of cased explosive.