Abstract
Abstract A systematic study has been made of the fractography of high stress low cycle fatigue of two high strength aluminium alloys, 2024 T351 and 7075–T6, stressed in pulsating tension at low frequency. Problematic features, one such being multiple fine ridges, were often observed adjacent to the fracture origin. These could not be explained in terms of Stage I or Stage II. As the crack front advanced the ridges began to display fatigue striations. The density of fatigue striations decreased with the progress of the crack, as expected, and well-defined relationships were found between the total number of striations along the length of the crack and the total number of applied cycles. Separate relations were found for smooth and notched samples and for the different alloys. These results can be of significant practical value, although their generality remains to be determined.
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