Implosion mechanisms of metallic cylindrical shells subjected to combined explosive loading and hydrostatic pressure

Underwater hollow structures are always subjected to high hydrostatic pressure and there is a serious risk of implosion. To investigate the effects of exploring the combined explosive loading and hydrostatic pressure on cylindrical shells in a deep water environment. A combination of background, experimental, and numerical simulations is used to investigate the response of aluminum alloy cylindrical shells subjected to impact loading under subcritical buckling pressure. Based on the non-contact underwater explosive load, a pressure tank impact explosion experimental device is designed, and the implosion experiments of cylindrical shells under different explosive intensities are carried out. Based on this simulation analysis, the relationship between the ambient water pressure and the explosive loading and implosion of cylindrical shells is investigated. Results show that at low external hydrostatic pressures, cylindrical shells can be induced to implode by large shock loads, and that different explosive loading leads to changes in the implosion damage pattern of cylindrical shells. Based on the results of the parametric analysis, the implosion boundary map is drawn and the danger level region is summarized. Finally, from the energy perspective, the results show that the internal energy of the shell is combined with the shock strength and hydrostatic pressure, and the relationship is nonlinear.