Systematic errors in digital volume correlation due to the self-heating effect of a laboratory x-ray CT scanner

B Wang, B Pan, Ran Tao, Gilles Lubineau

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The use of digital volume correlation (DVC) in combination with a laboratory x-ray computed tomography (CT) for full-field internal 3D deformation measurement of opaque materials has flourished in recent years. During x-ray tomographic imaging, the heat generated by the x-ray tube changes the imaging geometry of x-ray scanner, and further introduces noticeable errors in DVC measurements. In this work, to provide practical guidance high-accuracy DVC measurement, the errors in displacements and strains measured by DVC due to the self-heating for effect of a commercially available x-ray scanner were experimentally investigated. The errors were characterized by performing simple rescan tests with different scan durations. The results indicate that the maximum strain errors associated with the self-heating of the x-ray scanner exceed 400 µε. Possible approaches for minimizing or correcting these displacement and strain errors are discussed. Finally, a series of translation and uniaxial compression tests were performed, in which strain errors were detected and then removed using pre-established artificial dilatational strain-time curve. Experimental results demonstrate the efficacy and accuracy of the proposed strain error correction approach.
Original languageEnglish (US)
Pages (from-to)055402
JournalMeasurement Science and Technology
Volume28
Issue number5
DOIs
StatePublished - Mar 16 2017

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