The Fatigue Analysis for the Pressure Hull of Submarine

The structure of the submarine needs resist deep water pressure, buckle, under water shock, collision and fatigue damage. And the focus of design of pressure hull must have the capability to sustain deep water pressure, buckle, under water shock, collision and fatigue damage; nevertheless, the analysis of deep water pressure, buckle, under water shock and collision had been discussed. So, the aim of this research is to obtain the fatigue strength of submarine pressure hull under deep water pressure in the change.
Because of different task, the submarine will go on with float and dive in different depth, use to conceal the whereabouts. When the pressure hull sustain cyclic water pressure, the fatigue problem will appear. The discontinuous place of the submarine structure is the key area of the fatigue damage happened, it is worthy concern. As long as obtain S-N curve, the actual load history and the cumulative damage rule of the submarine pressure hall, the estimate of the fatigue life with pressure hull become possible.
Refer to the numerical pressure hull model of U209 Submarine established before. The stress analysis of pressure hall with cyclic water pressure will discuss where the place of local stress concentration occurs most possibly. Make a study of each local area of the cumulative fatigue damage for predict fatigue life of pressure hull. Additionally, when the mend of the man hole in the pressure hull doesn’t exist, it will cause which kind of influence on the fatigue life of pressure hull. To determine whether the design of the pressure hall can satisfy the requirement of a military submarine.