1.The Navy Research Center, Beijing 100073,China;
2.Harbin Marine Boiler and Turbine Research Institute, Harbin 150001,China;
3.College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001,China
Abstract:The response of structures subjected to underwater shock wave is a high nonlinear problem, the main difficulties of which are the determination of the magnitude of shock wave load and the response of structures under thetransient load. Based on an improved axisymmetric Smoothed Particle Hydrodynamics (abbreviated as SPH) method, the near-field load of the underwater explosion is calculated and then it is transmitted to the FEM solving package ABAQUS. Based on the coupled acoustic-structure model in ABAQUS, the nonlinear response of the structure is obtained. The solving process described above is named as SPH-FEM model, based on which, one can simulate the near-field underwater explosion starting from the detonation of the explosive charge to the large deformation,local tearing and complete damaging of the structure. The theoretical aspects of axisymmetric SPH method are presented in detail in the first part, and then in the numerical results, the shock wave pressure load is validated by the experimental data. After that, the responses of rectangular plates subjected to near-field explosion are numerically investigated. The numerical results agree well with the experimental observations. Finally, some useful conclusions regarding near-field explosion are drawn. The SPH-FEM model introduced here is robust and efficient, which is suitable for engineering applications.
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