Extended three-dimensional digital image correlation (X3D-DIC)

Julien Réthoré (1) , Jean-Philippe Tinnes (2) , Stéphane Roux (1) , Jean-Yves Buffiere (2) , François Hild (1)

1 LMT - Laboratoire de Mécanique et Technologie
2 MATEIS - Matériaux, ingénierie et science [Villeurbanne]

A correlation algorithm is proposed to measure full three-dimensional displacement fields in a three-dimensional domain. The chosen kinematic basis for this measurement is based on continuous finite-element shape functions. It is furthermore proposed to account for the presence of strong discontinuities, similarly to extended finite element schemes, with a suited enrichment of the kinematics with discontinuities supported by a (crack) surface. An optimization of the surface geometry is proposed based on correlation residuals. The procedure is applied to analyze one loading cycle of a fatigue-cracked nodular graphite cast iron sample by using computed tomography pictures. Subvoxel crack openings are revealed and measured.

Mots clés: Rupture; Discontinuity; Photomechanics

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

Julien Réthoré, Jean-Philippe Tinnes, Stéphane Roux, Jean-Yves Buffiere, François Hild. Extended three-dimensional digital image correlation (X3D-DIC). Comptes Rendus Mécanique, 2008, 336, pp.643-649. ⟨10.1016/j.crme.2008.06.006⟩. ⟨hal-00322190⟩