The early stages of formation of persistent slip markings in fatigue are analysed, using threedimensional discrete dislocation dynamics modelling. The surface displacements due to slip are computed using a specific post-processing method. Fatigue simulations under various strain ranges and grain sizes have been performed. The resulting surface slip markings and their evolutions are analyzed quantitatively, in terms of the marking height and thickness. A detailed scheme for persistent slip marking formation and morphology is proposed, in relation to the persistent slip-band dislocation arrangements present within the grain. The simulations show the crucial role of these arrangements for the extrusion-intrusion growth and localisation of slip at the band edges. Local stress concentrations inside the crystal and their relations to damage initiation are also analysed. The results provide insights for an original micro-crack initiation scheme, combining different initiation mechanisms as described in the literature.
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