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Influence of closure on the 3D propagation of fatigue cracks in a nodular cast iron investigated by X-ray tomography and 3D volume correlation

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Limodin Nathalie; Rethore Julien; Buffière Jean-Yves; Hild François; Roux Stéphane; Ludwig Wolfgang; Rannou Johann; Gravouil Anthony
journal (abréviation) Acta Materialia (Acta Mater)
volume (numéro) 58 (8)
  
pages 2957 – 2967
résumé Synchrotron X-ray tomography was performed during in situ fatigue crack propagation in two small-size specimens made of nodular graphite cast iron. While direct image analysis allows us to retrieve the successive positions of the crack front, and to detect local crack retardation, volume correlation allows for the measurement of displacement fields in the bulk of the specimen. The stress intensity factors (SIFs), which are extracted from the measured displacement fields and the corresponding local crack growth rate all along the front, are in good agreement with published results. In particular, it is possible to link the non-propagation of a crack with crack closure in the crack opening displacement maps or with a local value of the measured SIF range. It is shown that a non-uniform closure process along the crack front induces an asymmetric arrest/growth of the crack.
mots clés Synchrotron X-ray microtomography; 3D digital image correlation; Crack propagation; Stress intensity factors; Nodular graphite cast iron
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