Fatigue microcrack detection with digital image correlation

Jérémie Rupil (1, 2) , Stéphane Roux (1) , François Hild (1) , Ludovic Vincent (1, 2)

1 LMT - Laboratoire de Mécanique et Technologie
2 SRMA - Service des Recherches Métallurgiques Appliquées

A digital image correlation method is proposed to detect and quantify automatically microcracks on the surface of a specimen during a fatigue test. The proposed procedure allows for a fast scanning of the entire surface with all possible (pixel-wise) locations of microcrack centers and the detection of cracks having a sub-pixel opening. An experimental test case is presented as an illustration of the method and a comparison with a replica technique is performed.

Mots clés: Crack initiation; Digital image correlation; Mechanical fa- tigue; Microcrack detection

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Jérémie Rupil, Stéphane Roux, François Hild, Ludovic Vincent. Fatigue microcrack detection with digital image correlation. The Journal of Strain Analysis for Engineering Design, 2011, 46 (6), pp.492-509. ⟨10.1177/0309324711402764⟩. ⟨hal-00615472⟩