"Finite-element" displacement fields analysis from digital images : application to Portevin-Le Châtelier bands

G. Besnard (1) , François Hild (1) , Stéphane Roux (1)

1 LMT - Laboratoire de Mécanique et Technologie

A new methodology is proposed to estimate displacement fields from pairs of images (reference and strained) that evaluates continuous displacement fields. This approach is specialized to a finite-element decomposition, therefore providing a natural interface with a numerical modeling of the mechanical behavior used for identification purposes. The method is illustrated with the analysis of Portevin–Le Châtelier bands in an aluminum alloy sample subjected to a tensile test. A significant progress with respect to classical digital image correlation techniques is observed in terms of spatial resolution and uncertainty.

Mots clés: Digital image correlation; Localization; Resolution; Texture; Uncertainty

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

G. Besnard, François Hild, Stéphane Roux. "Finite-element" displacement fields analysis from digital images : application to Portevin-Le Châtelier bands. Experimental Mechanics, 2006, 46, pp.789-804. ⟨10.1007/s11340-006-9824-8⟩. ⟨hal-00124513⟩