In situ µCT-scan mechanical tests: Fast 4D mechanical identification

Abstract : A recently proposed " Projection-based Digital Volume Correlation " (P-DVC) method is extended in this work to a cone-beam lab-tomograph in which a mechanical test is performed. This consists of a crack propagation test in an elastic-brittle gypsum specimen. Kinematic analysis is performed based on a reduced finite element modeling for which the appropriate boundary conditions and crack propagation stage are determined from the radiographs. By considering only two projections per loading step, an integrated model-based analysis of the entire test provides a full space and time identification of the kinematics, including the crack position and the determination of two material parameters. This is achieved with a drastic reduction in the acquisition time compared to classical digital volume correlation analysis. In the examples presented, the acquisition time was reduced by a factor of 350.
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Clément Jailin, Amine Bouterf, Martin Poncelet, Stéphane Roux. In situ µCT-scan mechanical tests: Fast 4D mechanical identification. Experimental Mechanics, Society for Experimental Mechanics, 2017, ⟨10.1007/s11340-017-0305-z⟩. ⟨hal-01544539⟩

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