水下爆炸载荷下金字塔夹芯板抗冲击性能及破坏模式研究

Studying the dynamic response and impact resistance of metal sandwich panels subjected to underwater explosion is of great significance for improving the protection capability of ships. An equivalent loading device for underwater explosion impact experiment is used for the pyramid lattice sandwich panel, and the dynamic response law of the panel is obtained. The Abaqus coupled Eulerian-Lagrangian method is adopted to calculate the impact process, and the error between the calculated results and the experimental data is small. The validity of the simulation is verified. The three-stage characteristics of the dynamic response of the pyramid sandwich panel is acquired. The impact resistance of the sandwich panel is evaluated through the deformation of the back plate and the plastic energy absorption of the core layer. The different failure modes of the sandwich panels with different parameters are analyzed by simulations. The results show that: when the total thickness of the sandwich panel is constant, the impact resistance of the sandwich panel with a thinner front panel and a thicker back panel is stronger; the failure modes of the core layer composed of pyramid rods with different thicknesses vary, but the deformations of the back panels are similar; the plastic energy absorption ratio of the core layer decreases with the increase of impact load; the multi-objective optimization method is used to optimize the parameters of the core layer. The conclusion is that the impact resistance of the optimized sandwich panel is significantly improved, and the optimization results have guiding significance for the design of pyramid sandwich panels.