Abstract
The shape development of surface cracks under pure bending fatigue is basically independent of the load type. Crack shape variations are initially influenced by the geometry of the starter notch, but specimen dimensions predominate in later stages of fatigue life. Also, residual stresses may significantly affect the initial crack geometry variations; however, their influence diminishes as the crack growth progresses. This paper describes the shape changes observed under constant amplitude fatigue in bending. Slight differences noted in the random loading fatigue will not be considered here and are the subject of a separate study.
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