Fatigue Life Assessment of Ship Hatch Corner Based on Hot Spot Stress Method

The hatch corner of ship is the most prone area for stress concentration, which makes the fatigue problem of hatch corner particularly serious, and becomes a position that is easily damaged. Firstly, the hot spot stress method based on surface extrapolation is introduced, and the hatch corner of a bulk carrier is selected as the research object, the scale model test is designed and carried out, the finite element model is established, and the parameters of the corner form and different transition radii are analyzed. The CCS calculation specification evaluates the fatigue strength of hatch corner, and compares the test results with the finite element calculation results. The results show that the hot spot stress method has good adaptability to the fatigue assessment of hatch corner, and the fatigue strength evaluation of hatch corner needs to select the corresponding S–N curve according to the position of the maximum hot spot stress. The form of corner and the increase of transition radius are of great significance for alleviating stress concentration effect and improving fatigue life of corner, which provides reference for fatigue resistance and optimal design of hatch corner structure.