Analysis and artifact correction for volume correlation measurements using tomographic images from a laboratory X-ray source

Nathalie Limodin (1) , Julien Réthoré (2) , Jérôme Adrien (1) , Jean-Yves Buffiere (1) , François Hild (3) , Stéphane Roux (3)

1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
3 LMT - Laboratoire de Mécanique et Technologie

The effects of three artifacts (reconstruction, beam hardening and temperature of the X-ray tube) associated with the use of a lab tomograph are analyzed in terms of their induced biases for Digital Volume Correlation (DVC) from a series of reconstructed volumes acquired successively. The most detrimental effect is due to spurious dilatational strains induced by temperature variations in the tomograph. If they are not accounted for, any quantitative kinematic measurement is impossible for strain levels below 0.5 %.

Mots clés: Quantitative kinematic measurements; Reconstruction artifacts; Thermal expansion; X-ray computed microtomography

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

Nathalie Limodin, Julien Réthoré, Jérôme Adrien, Jean-Yves Buffiere, François Hild, et al.. Analysis and artifact correction for volume correlation measurements using tomographic images from a laboratory X-ray source. Experimental Mechanics, 2011, 51 (6), pp.959-970. ⟨10.1007/s11340-010-9397-4⟩. ⟨hal-00521190⟩