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Prediction of fatigue crack initiation lives at elongated notch roots using short crack concepts

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2012
auteur(s) Castro Jaime Tupiassú Pinho; Meggiolaro Marco Antonio; Miranda Antonio Carlos de Oliveira; Wu Hao; Imad Abdellatif; Benseddiq Noureddine
journal (abréviation) International Journal of Fatigue (Int J Fatig)
volume (numéro) 42
  
pages 172 – 182
résumé Re-initiation lives of fatigue cracks departing from stop-holes roots, previously introduced at the tip of deep cracks on modified SE(T) specimens, have been satisfactorily predicted using their properly calculated notch sensitivity factor q, considering the notch tip stress gradient influence on the fatigue behavior of mechanically short cracks. This is an indispensable detail, since traditional q estimates are only applicable to semicircular notches, whereas elongated slits can have q values which also depend on their shape, not only on their tip radius. Based on this experimental evidence, a criterion for acceptance of short cracks is proposed.
mots clés Notch sensitivity; Short cracks; Non-propagating cracks; Fatigue life prediction; Short crack tolerance
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