Three dimensional image correlation from X-Ray computed tomography of solid foam

Stéphane Roux (1) , François Hild (1) , Philippe Viot (2) , Dominique Bernard (3)

1 LMT - Laboratoire de Mécanique et Technologie
2 LAMEFIP - Laboratoire Matériaux Endommagement Fiabilité et Ingénierie des Procédés
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

A new methodology is proposed to estimate 3D displacement fields from pairs of images obtained from X-Ray Computed Micro Tomography (XCMT). Contrary to local approaches, a global approach is followed herein that evaluates {\em continuous} displacement fields. Although any displacement basis could be considered, the procedure is specialized to finite element shape functions. The method is illustrated with the analysis of a compression test on a polypropylene solid foam (independently studied in a companion paper). A good stability of the measured displacement field is obtained for cubic element sizes ranging from $16$ voxels to $6$ voxels.

Mots clés: digital image correlation; Cellular material; shape function; displacement uncertainty; strain localization

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

Stéphane Roux, François Hild, Philippe Viot, Dominique Bernard. Three dimensional image correlation from X-Ray computed tomography of solid foam. Composites Part A: Applied Science and Manufacturing, 2008, 39 (8), pp.1253-1265. ⟨10.1016/j.compositesa.2007.11.011⟩. ⟨hal-00198126⟩