Comparison of local and global approaches to digital image correlation

François Hild (1) , Stéphane Roux (1)

1 LMT - Laboratoire de Mécanique et Technologie

Local and global approaches to digital image correlation are compared when the displacement interpolation is based upon bilinear shape functions (i.e., with four-node quadrilaterals). The resolution in terms of displacements and strains associated with both techniques are evaluated a priori and validated a posteriori by using series of images of real experiments. It is shown that global approaches generally out-perform a local approach.

Mots clés: 4-noded quadrilaterals; Displacement; Full- eld measurements; Resolution; Standard uncertainty; Strain

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

François Hild, Stéphane Roux. Comparison of local and global approaches to digital image correlation. Experimental Mechanics, 2012, 52 (9), pp.1503-1519. ⟨10.1007/s11340-012-9603-7⟩. ⟨hal-00750756⟩