Wang Y., Tong Z., Hua H.

In order to improve the survivability of warships to underwater explosion, a new type of shock absorption and isolation rubber structure is proposed. The structure is based on the principle of energy absorption through structural deformation, and shock wave reflection between the interfaces of materials with great sound impedance mismatch. Experiments were conducted to study the shock protection ability and dynamic responses of a model with the shock absorption and isolation structure. The shock protective layer (SPL) is stuck to the outer hull of the experimental model, which is a 13.2m¡Á0.8m¡Á0.45m steel box with stiffeners simulating ship structures. The box with its ballast weighs 3500 kg and has a 0.35m waterline. The first natural frequency is 5.5Hz, corresponding to a bend mode. Experiments were conducted in a semispherical water pond. The spherical explosion charge is 0.5kg TNT and located 5m under the bottom of the model. Shock responses of the model with and without shock protection layer are compared.