Hydro-elastic-plastic dynamic response of a ship hull girder subjected to an underwater bubble

► We establish a model of both an underwater bubble and an elastic-plastic ship hull girder. ► Resonance phenomenon will happen when the bubble pulsating frequency is close to the ship hull's low-order eigenfrequency. ► Smaller charge weight can make much larger bending moment when resonance happens. ► A single plastic hinge will form when the hull girder's longitudinal bending moment exceeds its ultimate bending moment. ► The plastic deformation of the hull girder features a sharp rise and a short duration.