Numerical Study on the Sagging Damage of the Simplified Hull Girder Subjected to Underwater Explosion Bubble

The pulsation of the bubbles resulting from underwater explosions can lead to severe damage structure ship’s hull, and even its sinking. To study mechanism a simplified hull girder (SHG) subjected near-field explosion bubble, Coupled Eulerian–Lagrangian (CEL) method based on verifications calculation accuracy was used simulate 11 SHG structures. sagging bend SHGs analyzed perspective plastic hinge lines. Moreover, length formula potential zone studied through assumed influence transverse bulkheads bending mode total longitudinal strength investigated. results show that SHGs’ is composed regular lines, mainly depending side plates’ folding—W-shaped in this paper. When facing distant do not always play positive role.