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Crack closure and stress intensity factor measurements in nodular graphite cast iron using three-dimensional correlation of laboratory X-ray microtomography images

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) Limodin Nathalie; Rethore Julien; Buffière Jean-Yves; Gravouil Anthony; Hild François; Roux Stéphane
journal (abréviation) Acta Materialia (Acta Mater)
volume (numéro) 57 (14)
  
pages 4090 – 4101
résumé Three-dimensional (3-D) tomographic images of a nodular graphite cast iron obtained using a laboratory X-ray source were used to analyze the opening of a fatigue crack during in situ mechanical loading. Direct image analysis and digital image correlation are utilized to obtain the 3-D morphology and front location of the crack, as well as the displacement fields in the bulk of the specimen. From digital image correlation results it is possible to extract the crack opening displacement (COD) map in the whole sample cross-section and to compute stress intensity factors (SIFs) all along the crack front, even for COD values that are less than the image resolution. The comparison of COD maps with local values of the SIF enabled for an estimation of the opening SIF (Kop) equal to 6 MPa m1/2.
mots clés X-ray microtomography; 3-D digital image correlation; Stress intensity factors; Nodular graphite cast iron
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