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

Abstract : 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.
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Submitted on : Tuesday, September 16, 2008 - 10:59:34 PM
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Julien Réthoré, Jean-Philippe Tinnes, Stéphane Roux, Jean-Yves Buffiere, François Hild. Extended three-dimensional digital image correlation (X3D-DIC). Comptes Rendus Mécanique, Elsevier Masson, 2008, 336, pp.643-649. ⟨10.1016/j.crme.2008.06.006⟩. ⟨hal-00322190⟩

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