An extended and integrated digital image correlation technique applied to the analysis of fractured samples

Julien Réthoré (1) , Stéphane Roux (1) , François Hild (1)

1 LMT - Laboratoire de Mécanique et Technologie

To reduce the measurement uncertainty, a measurement technique is proposed for estimating full displacement fields by complementing digital image correlation with an additional penalization on the distance between the estimated displacement field and its projection onto the space of elastic solutions. The extended finite element method is used for inserting discontinuities independently of the underlying mesh. An application to the brittle fracture of a silicon carbide specimen is used to illustrate the application. To complete the analysis, the crack tip location and the stress intensity factors are estimated. This allows for a characterization of the measurement and identification procedure in terms of uncertainty.

Mots clés: digital image correlation; equilibrium gap method; extended finite element method

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

Julien Réthoré, Stéphane Roux, François Hild. An extended and integrated digital image correlation technique applied to the analysis of fractured samples: The equilibrium gap method as a mechanical filter. Revue Européenne de Mécanique Numérique/European Journal of Computational Mechanics, 2009, 18, pp.285-306. ⟨10.3166/ejcm.18.285-306⟩. ⟨hal-00200643⟩