Elastomer-coted Steel Plate Underwater Explosion Impact Response Of Characteristic

During the implementation of combat missions, naval vessels are possible to be attacked by weapons from above or under water. To enhance the survival ability of vessels under such attacks, it is of primary importance to design the modern vessel with high-quality of anti-shock and protection capability. Many models of designs have been proposed. It is found that the anti-shock ability of the vessel could be enhanced by coating polyurea elastomer onto steel plate (deck). First section in this paper is about to test the mechanical properties of the polyurea elastomer. MTS810 servo testing machine and split Hopkinson bar are used to measure the compressive stress - strain curves of the polyurea in quasi-static and dynamic loading, respectively. The purpose of these tests is to obtain its mechanical parameters for finite element simulations.In second section, the study on the anti-shock capability of elastomer-coated steel plate is presented. By using finite element software ANSYS / LS_DYNA, the dynamic response of both steel plate and elastomer-coated steel plate are simulated. A simplified element model of elastomer-coated plates was established, where nonlinear of material properties, contact conditions and large deformation are included. By using constant mass of explosive, numerical simulations are performed to show the effects of different explosive distance, the thickness of the coated elastomer, and different ways of coating (on front side, back side and both sides of steel plate) on the blast-resistant capacity. Analyzing the simulation results, such as deformation, failure and equivalent stress of elements, it is found that the blast-resistant capacity of plates is improved by the coated elastomer. A series of nonlinear dynamic responses, such as the displacement and the velocity of elements, and the structural local failure process are analyzed too. Changing the failure strain and the initial modulus of polyurea elastomer in simulations, the influence of the coated elastomer mechanical properties on the blast-resistant capacity of these plates is also investigated. Furthermore, it is suggested how to design the elastomer-coated steel plate with high blast-resistant capacity.Finally underwater explosion tests are performed. The test results show that the coated polyurea elastomer can enhance the blast-resistant capacity of steel plate, and verify the numerical simulation results presented.