Study on Protective Structure Penetrated by the Shaped-Charge Jet for Ship Hull

Abstract

Abstract Based on the algorithm of Coupled Eulerian Lagrangian (CEL), the processes of the generation of shaped charge jet (SCJ) and the penetration to the inner and outer ship side plates were simulated by the finite element analysis (FEA). Meanwhile, the residual velocity of SCJ after penetrating the side plate could be obtained. In order to compare with the FEA results, the damage caused by the SCJ to the inner and outer plates of the ship side was experimentally studied, and the residual velocity was measured successfully. The comparison demonstrated that the values of the residual velocity obtained by simulation well agreed with the experimental results. The simulation indicated that the velocity of the SCJ decreased after penetrating the inner plate. Moreover, the influences of the ship side structural details, including the inner plate thickness, the distance between the inner and outer plates and the layout of the inner plate, on its protective ability against SCJ were investigated. The research indicated that increasing the thickness of inner plate and the spacing between inner and outer plates can effectively reduce SCJ residual velocity. Replacement of the inner plate with a multilayer plate could obviously reduce the SCJ residual velocity. The simulation method could describe the process of SCJ generation and penetration accurately, and the research results could provide references for the protective structural design of the ship hull attacked by SCJ.