A calculation method for ship structure damage under cabin explosion

The explosion of missiles penetrating the interior cabin could cause extensive damage to the warship structure. How to evaluate the damage range of the ship structure under the coupling of multiple loads in the inner explosion is a big challenge for engineering researchers. In order to establish a theory method of ship structural damage caused by cabin inner implosion, a large-scale cabin model was designed in this paper, and an inner explosion experiment was carried out on the cabin model. The damage range of the cabin structure was measured and typical failure models were acquired. The damage mechanism of the ship structure under the coupling effect of multiple loads (including extensive shock wave loading and quasi-static pressure loading) under inner implosion was analyzed. Based on experimental results, the theory method of ship structure damage range under inner blast was established. It was indicated that: (1) the cabin model would be subjected to shock wave and quasi-static pressure loadings after the explosive charge was detonated, which led to large area damage and complex failure models; (2) quasi-static pressure was the major destroying element for cabin model damage under inner blast; (3) the theory analysis method proposed by this paper simultaneously considered the coupling effect of shock wave and quasi-static pressure loadings for the damage of the cabin model, the theory results well coincided with the experimental ones. The established calculation method can be applied to evaluate the damage range of ship structure subjected to implosion loading. © 2024 Explosion and Shock Waves. All rights reserved.