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Conference papers
Quantitative investigation of grain boundary sliding in halite rock by SEM in situ testing and full field strains measurements
Abstract : An experimental investigation of the deformation mechanisms acting in halite at the scale of its polycrystalline microstructure is presented. Uniaxial compression tests on centimetric samples are performed inside the chamber of a scanning electron microscope and the obtained high definition images are processed by digital image correlation (DIC) routines. A special marking procedure provides an appropriate contrast at microscale. Standard DIC routines qualitatively demonstrate the coexistence of two deformation mechanisms: crystal slip plasticity and grain boundary sliding. A specific post-processing of the DIC-evaluated displacement fields provides a first quantification of the relative contribution of these mechanisms to overall strain and a dependence with grain size can be demonstrated. A modified DIC formulation able to separate intra-grain deformation from interfacial gliding is also proposed for a better quantification and preliminary results are presented. Such data will be of primary interest for the construction of physically-based multiscale models of the mechanical properties of halite, which might be used for security assessment of deep caverns in salt-rock.
https://hal-enpc.archives-ouvertes.fr/hal-01587092
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Submitted on : Tuesday, May 10, 2022 - 4:21:04 PM
Last modification on : Wednesday, May 11, 2022 - 3:16:13 AM
Contributor : Navier Documentation Connect in order to contact the contributor
Submitted on : Tuesday, May 10, 2022 - 4:21:04 PM
Last modification on : Wednesday, May 11, 2022 - 3:16:13 AM
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