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Journal Articles Comptes Rendus. Mécanique Year : 2023

A projection-based approach to extend digital volume correlation for 4D spacetime measurements

Abstract

In-situ (tomography) experiments are generally based on scans reconstructed from a large number of projections acquired under constant deformation of samples. Standard digital volume correlation (DVC) methods are based on a limited number of scans due to acquisition duration. They thus prevent analyses of time-dependent phenomena. In this paper, a modal procedure is proposed that allows time-dependent occurrences to be analyzed. It estimates spacetime displacement fields during the whole loading history. The spatial modes are based on standard DVC, which is subsequently enriched using projection-based digital volume correlation (P-DVC) to measure the temporal amplitudes. The method is applied to two cases, namely, a virtual experiment mimicking wedge splitting and an actual shear test on a pantographic metamaterial inducing large motions. With the proposed method, the temporal amplitude in the real test was measured for each projection leading to a temporal resolution of one tenth of a second and the analysis of 16,400 time steps. For the proposed algorithm, the sensitivity to the acquisition angle of the sample was investigated and measurement uncertainties were assessed.
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Dates and versions

hal-04079703 , version 1 (24-04-2023)

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Viktor Kosin, Amélie Fau, Clément Jailin, Benjamin Smaniotto, Thomas Wick, et al.. A projection-based approach to extend digital volume correlation for 4D spacetime measurements. Comptes Rendus. Mécanique, 2023, 351, pp.265-280. ⟨10.5802/crmeca.192⟩. ⟨hal-04079703⟩
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