In this paper, we have studied the influence of the panel thickness on the underwater impact resistance performance of the pyramid lattice structure based on the SPH-FEM method. Firstly, a benchmark case is simulated and compared with the experimental results to verify the accuracy of SPH-FEM for fluid-structure interaction (FSI) problems. Then, the dynamic response of the pyramid lattice structure subjected to the shock wave is studied by the SPH-FEM coupling method. Also, the sandwich structure's deformation is compared with experimental results to verify the effectiveness of the presented method applied in the FSI problem. Based on this, we study several groups of pyramid lattice structures with different panel thicknesses. In terms of the deflection of the back panel and each part's energy-absorption rate, the influence of the thickness of the panel on the impact resistance of the pyramid lattice sandwich structure is studied in detail. The results of this paper can provide a reference for the design of the ship protection structure.

在本文中，我们基于SPH-FEM方法研究了面板厚度对金字塔格结构在水下抗冲击性能的影响。首先，对一个基准案例进行仿真，并将其与实验结果进行比较，以验证SPH-FEM解决流体-结构相互作用（FSI）问题的准确性。然后，通过SPH-FEM耦合方法研究了金字塔格结构在冲击波作用下的动力响应。此外，将三明治结构的变形与实验结果进行了比较，以验证所提出的方法在FSI问题中的有效性。基于此，我们研究了具有不同面板厚度的几组金字塔晶格结构。就背板的挠度和每个部件的能量吸收率而言，详细研究了面板厚度对金字塔格三明治结构耐冲击性的影响。研究结果可为船舶防护结构的设计提供参考。