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Abstract
The use of empirically developed procedures infatigue life predictions is current practice for notched members under the joint action of mechanical loads and a corrosive environment. A simple model has been investigated in which the total fatigue life of a notched member is considered to be the sum of the crack initiation and crack propagation lives. The local strain approach has been employedfor the crack initiation life estimates. A linear elastic fracture mechanics concept using the Paris relationship was used for fatigue crack propagation life estimates. It is shown that the influence of the corrosive environment on fatigue life can be incorporated by determining the relevant material properties in the environment of interest. Testing environments include laboratory conditions and Arabian Gulfsea water. Fatigue life predictions were compared with experimental datafor centre notched specimens having a stress intensity factor of 2·4 for blunt notches and 4·2 for sharp notches. Good correlation between the analytical predictions and experimental data was observed.
MST/2046