STUDY ON PLASTIC DAMAGE OF CLAMPED MULTI-LAYER SHEET STRUCTURE CAUSED BY UNDERWATER EXPLOSION

In order to study the damage behavior of a clamped multi-layer sheet structure caused by underwater explosion, a plastic response model for the typical multi-layer sheet structure due to shock waves of underwater explosion was established by an energy method. The calculation method of plastic deformation and shear fracture damage for clamped multi-layer sheet structure under certain frontal explosion loading is developed. Using the AUTODYN software, the numerical simulations of the damage of the clamped multi-layer sheet structure under different conditions were carried out. Also, the underwater explosion damage experiments were conducted and the shock-wave parameters of underwater explosion as well as the damage parameters of the multi-layer sheet structure were tested. According to the numerical simulation and experimental results, it can be found that the theoretical model can well predict the damage behavior of the multi-layer sheet structure, including the numbers of the plastic deformation layer and the shear failure layer as well as the maximum failure depth of the multilayer sheet structure. The work of this paper provides a certain basis for the anti-shock design of underwater multi-layer protective structures.