DYNAMIC RESPONSES ANALYSIS AND ESTIMATION OF PYRAMIDAL SANDWICH PLATE SUBJECTED TO SLAMMING IMPACT

The fluid-solid interaction (FSI) dynamic responses for a Light Weight Pyramidal Sandwich Plate Structure (LWPSPS) under different water-impact velocities (1m/s~6m/s) are investigated numerically and theoretically. The finite element method (FEM) computational model of multi-physics (air-water-solid) is built and the characteristics of slamming pressure and structure deformation are obtained based on the proposed 3D multi-physics FEM model. Hydroelastic analysis demonstrates that the FSI effect is weak when the ratio of time of water impact duration to the wet natural period of a LWPSPS is higher than 4. Numerical results show that both the average slamming pressure and the maximum deformation of LWPSPS are much lower than those of monolithic plate with same mass. Furthermore, a phenomenon called #x0201c;local air cushion#x0201d; is observed for LWPSPS which is not existed for a monolithic plate. In the study, an engineering estimation method to predict the maximum deformation of the LWPSPS is proposed, in which the total deformation is divided into two parts, i.e. the local field deformation and the global field deformation. Good agreement between the FEM numerical results and those obtained from the proposed engineering estimation method is achieved.