ABSTRACT
This chapter describes finite element analysis sub-model procedures for calculating the stress intensity factors (SIF) and a spectral analysis based fatigue loading generation procedure. In fatigue crack growth calculation, the SIF range is transferred to equivalent SIF range which concerning the loading interaction and the mean stress effect when the fatigue loading amplitudes are variable or there is nonzero mean stress or residual stress. The crack growth rate model, the stress intensity factor calculation method, the fatigue loading generation and crack growth calculation are the key procedures in fatigue strength assessment of details of marine structures based on fracture mechanics. Crack growth rate model is the core of fatigue crack growth prediction. To predict the fatigue life of a structure component accurately, the fatigue load spectrum should simulating the loading conditions as real as possible. SIF of surface cracks with different sizes in the detail under different loading conditions should be calculated accurately.
