Abstract
A multilayer gradient double-corrugated sandwich plate was designed, and the finite element method was employed to investigate numerically the dynamic responses of the sandwich plate subjected to underwater blast loads. ALE modeling method was adopted to simulate the fluid-structure interaction between the water and sandwich plate. TNT explosive was modeled by the JWL model, and the 304 stainless steel used for the double-corrugated sandwich plate was modeled by Johnson-Cook constitutive model. The peak deflection of the back face sheet, the support reaction at the edge of the sandwich plate, and the energy absorption of the structure were discussed to assess the underwater blast resistance of the double-corrugated sandwich structure. The results show that the configuration P2 with the increasing core relative density has a better blast resistance ability and the weakest upper core layer of the configuration P2 has the greater contribution to reducing the impulse transmission to the sandwich structure.
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