Mechanical behavior of composite ship structures with open-hole

Abstract

Composite materials, as advanced structural and functional materials, are increasingly used in naval and civilian fields. There are different structures with open-hole in the ship hull. The open-hole damages the continuity of the composite structure and has a direct impact on the strength and stability of the composite structure. Therefore, it is of great significance to study the mechanical behavior of composite ship structures with open-hole to ensure the safety of the ship. Based on the numerical method, the mechanical behavior of the typical composite ship structures with open-hole was investigated, and the critical buckling load, buckling mode, post-buckling behavior, ultimate bearing capacity and stress concentration of the composite structures with open-hole were analyzed. The Hashin failure criterion and complete unloading failure model were used to analyze the nonlinear buckling behavior of different composite structures with open-hole. The results show that the ultimate bearing capacity of the composite structures with typical open-holes such as rectangle, rhombus, ellipse and circle is more than 2 times of its critical buckling load, this proves that the composite structures with open-hole can have a certain bearing capacity after initial buckling. Compared with the same scale structure without open-hole, the critical buckling load and ultimate bearing capacity are reduced by about 10% and 50%, respectively. The influence of various open-holes and layer thickness on the mechanical behavior of composite ship structures is estimated through the parametric study, which provides an effective reference for the design optimization and performance evaluation of composite ships.