Theoretical calculation method for the response of hull girder subjected to underwater explosion

Abstract To study the overall motion response of a pressure-resistant hull structure subjected to underwater explosion loads, the process of spherical shock waves and bubble pulsation pressure generated by the explosion acting on the hull is first analyzed. The delay time of the spherical shock wave action is considered, and the formula for calculating the diffraction pressure on the hull under underwater explosion is derived. Then, the hull was simplified as a variable cross-section Timoshenko beam, and the theoretical calculation formula for the overall response of the hull beam model under explosive loads was derived. A theoretical method for calculating the overall motion response of girders under underwater explosion loads has been established. This method can reflect the overall low-frequency motion characteristics of ship hull beam structures under explosion loads, providing a theoretical method for studying the overall response damage of pressure-resistant ships under underwater explosion loads and the dynamic strength of ship hull structures.