Analysis of bearing characteristics of composite sandwich cylindrical shell under hydrostatic pressure

Based on the finite element software ABAQUS, this paper uses a three-dimensional cohesive element to simulate the interface between the skin and the core, and establishes a prediction method for the ultimate bearing capacity of a composite sandwich cylindrical shell under hydrostatic pressure. The numerical calculations are in good agreement with the experimental results, which verifies the accuracy and feasibility of the numerical models and calculation methods. Furthermore, the influence of core modulus of floating/sound absorbing composite sandwich cylindrical shell on bearing characteristics was studied. Based on the integrated calculation of Isight and ABAQUS, the optimization goal is to improve the critical instability load, and the surface winding method of the composite sandwich cylindrical shell under deep water static pressure is optimized to obtain the optimal surface winding angle. The research results have certain reference value and guidance for the underwater application and research of composite sandwich cylindrical shells.