Abstract
Fretting fatigue occurs at contact regions of structural components subjected to contact pressure, friction stress and cyclic fatigue stress. In fretting fatigue the early stage of crack growth is influenced by the magnitude of the above pressure and stresses and its main crack grows to oblique direction to the contact surface. A method for evaluating stress intensity facotrs KI and KII for not oblique but normal cracks in fretting fatigue has been proposed by Rooke & Jones. This paper expanded the method into oblique cracks by obtaining the Green's functions of stress intensity factors for oblique cracks by the boundary element analysis. The results were represented by formulae as functions of crack angle, crack length, and applied load conditions, such as bulk fatigue stress, contact pressure, friction stress, and their distribution. The stress intensity factors under arbitrary fretting fatigue conditions can be calculated easily by substituting those values.
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