<Emphasis Type="Italic">In situ</Emphasis><Emphasis Type="Italic">μ</Emphasis> CT-scan Mechanical Tests: Fast 4D Mechanical Identification |
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Authors: | C Jailin A Bouterf M Poncelet S Roux |
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Institution: | 1.LMT (ENS Paris-Saclay/CNRS/Univ. Paris-Saclay),Cachan,France |
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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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