Research on the dynamic ultimate bearing capacity of the bow structure of a ship hull under slamming load

Abstract The impact of slamming loads on the safety of hull structures becomes increasingly evident with the increase in the principal dimensions of ships, the flexibility of hull structures, and the sailing speed. Compared with grillage structures, the hull girder can significantly reflect the dynamic characteristics of the bow structure of the hull under slamming loads. Firstly, taking the static ultimate bearing capacity of the Dowling box girder structure as the research object, the nonlinear finite element software Abaqus was employed to establish a numerical simulation technique for the static ultimate bearing capacity based on the quasi-static method. The reliability of the numerical model was verified through the comparison between the numerical and experimental results. Subsequently, numerical simulation techniques for the static ultimate bearing capacity and the dynamic ultimate bearing capacity of the bow part of the hull were established based on the quasi-static method and the dynamic explicit method. Research was carried out on the static ultimate bearing capacity of the hull structure, the slamming dynamic responses under different impact loads, and their corresponding failure modes. A referential method for measuring the ultimate bearing capacity of the bow structure of the hull under slamming loads was proposed by using the dimensionless ratio of the plastic residual deformation amount in the direction of the impact load to the ultimate deformation amount of the static ultimate bearing capacity.