Ship structure resistance to underwater contact explosion with multi medium coupling calculation

To investigate the stiffened double-layer structure of ship resistance to underwater contact explosion, ALE (Arbitrary Lagrangian-Eulerian) was adopted and reinforced double-layer structure model was established on the basis of ship bottom structure by a multi medium coupling calculation technology. LSDYNA 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, velocity, acceleration and deformation of inner panel were compared. The rule of blastresistance 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.