ABSTRACT
The anti-shock design of broadside structure in large ships has attracted great attention in the field of naval architecture and ocean engineering. The impact of broadside structure subjected to underwater explosion is a complex Fluid-Structure Interaction (FSI) problem. In this paper, the Coupled Eulerian-Lagrangian (CEL) method is proposed to solve this problem. Firstly, the CEL method is verified by a free-field underwater explosion model. Afterwards, the relationship between incidence, reflection and transmission of stress wave in a section-varying bar was derived by the stress wave theory. Moreover the propagation characteristics of stress waves in the side plate structure under underwater explosion loads were discussed based on CEL method. We found that section-varying structure can reduce the intensity of stress wave. This study provided solid basis for the design of impact resistance of ship side structures.
