Research on Blast-resistance Ability of Stiffened Double-Layer Structure of Ship Subjected to Underwater Contact Explosion

In order to investigate the blast-resistance ability of stiffened double-layer structure of ship subjected to underwater contact explosion, stiffened double-layer structure was created according to classical ship bottom structure. LS-DYNA was used to simulate the cylinder shaped TNT contact explosion on 4 different places of outer panel. The crevasse radius of the outer panel of 4 models were analyzed and compared with each other. The effective stress, the velocity, the acceleration and the deformation of inner panel were compared also. The rule of blast-resistance ability was obtained through the comparisons. It reveals that the blast-resistance ability unrelated to the distribution of reinforced structures. The maximum crevasse radius of different explosion places is similar to each other. The distribution of strength reinforced structures lead the difference of shape of crevasse and the dynamic response of inner panel. The blast-resistance ability needs to be improved.