Three dimensional image correlation from X-Ray computed tomography of solid foam
TLDR
In this paper, a new methodology is proposed to estimate 3D displacement fields from pairs of images obtained from X-ray computed microtomography (XCMT) and a global approach is followed that evaluates continuous displacement fields.Abstract:
A new methodology is proposed to estimate 3D displacement fields from pairs of images obtained from X-ray computed microtomography (XCMT). Contrary to local approaches, a global approach is followed herein that evaluates continuous displacement fields. Although any displacement basis may 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 to 6 voxels.read more
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Quantitative X-ray tomography
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TL;DR: In this paper, the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight than conventional attenuation based tomography.
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3D Studies of Indentation by Combined X-Ray Tomography and Digital Volume Correlation
Mahmoud Mostafavi,Yelena Vertyagina,Christina Reinhard,Robert S. Bradley,Xia Jiang,M. Galano,James Marrow +6 more
TL;DR: In this paper, three-dimensional digital image correlation (digital volume correlation) is applied to study deformation beneath indentations, mapping the relative displacements between high-resolution synchrotron X-ray computed tomographs (0.9 μm voxel size).
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Journal ArticleDOI
Comparison of Local and Global Approaches to Digital Image Correlation
François Hild,Stéphane Roux +1 more
TL;DR: It is shown that global approaches generally out-perform a local approach when the displacement interpolation is based upon bilinear shape functions (i.e., with four-node quadrilaterals).
References
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Posted Content
Digital Image Correlation: From Displacement Measurement to Identification of Elastic Properties - A Review
François Hild,Stéphane Roux +1 more
TL;DR: In this article, a general presentation of the extraction of displacement fields from the knowledge of pictures taken at different instants of an experiment is given, and different strategies can be followed to achieve a sub-pixel uncertainty.