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Article Dans Une Revue International Journal of Solids and Structures Année : 2022

Multiscalar DIC Analyses of Granular String Under Stretch Reveal Non-standard Deformation Mechanisms

Résumé

Mechanical tests designed to measure classical behavior do not provide information underlying the macroscale response. Multiscalar digital image correlation (DIC) can be employed in these experiments to expose the micro-mechanisms that lead to the emergent macroscale behavior. DIC was performed at macroscale in which the underlying microstructure is overlooked and the construct is treated as a continuum bar. Further, the underlying microstructure was exploited in a microscale DIC analysis to expose the rich deformation regimes. In addition, mesoscale analysis was carried out to extract the rigid body motions that characterize a granular material system. These analyses were performed for two types of surface patterns and measurement uncertainties were quantified. The microscale results show that the grain string can be treated as a granular material composed of a set of nearly rigid grains that store elastic energy through intergranular mechanisms. Further, the results reveal non-standard deformation mechanisms that underlie the chiral granular string subjected to extension. These mechanisms include grain rotations that are coherent as opposed to gear-like grain rotation. More notably, grain transverse displacements are observed that are controlled by the behavior of the grain interconnections.
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Dates et versions

hal-03482296 , version 1 (15-12-2021)

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Nima Nejadsadeghi, Michele de Angelo, Anil Misra, François Hild. Multiscalar DIC Analyses of Granular String Under Stretch Reveal Non-standard Deformation Mechanisms. International Journal of Solids and Structures, 2022, 239-240, pp.111402. ⟨10.1016/j.ijsolstr.2021.111402⟩. ⟨hal-03482296⟩
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