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Effect of claystone small-scale characteristics on the variability of micromechanical response and on microcracking modelling

Abstract : Argillaceous rocks have a complex and heterogeneous structure at different scales. At the scale of the mineral inclusions embedded in a clay matrix, the deformation generally induces microcracking and material damage. Modelling the latter requires to take into account microscale characteristics and their effect on the micromechanical response. This response can be used in double scale approach to predict material behaviour at larger scale. Thus, heterogeneous microstructures of a claystone are generated with a distribution of morphological properties satisfying experimental observations. The overall microscale material behaviour under solicitation is obtained by numerical homogenisation. Then, the variability of the material response is studied with regard to small-scale characteristics. In terms of deformation and failure, a dominant shear deformation mode and decohesion between grains are observed. The decohesion induces microcracking in the microstructure and strain softening of its overall response.
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https://hal.univ-grenoble-alpes.fr/hal-03066487
Contributeur : Pierre Bésuelle <>
Soumis le : mardi 15 décembre 2020 - 12:14:19
Dernière modification le : mardi 26 janvier 2021 - 03:28:50
Archivage à long terme le : : mardi 16 mars 2021 - 19:22:44

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Benoît Pardoen, Pierre Bésuelle, Stefano Dal Pont, Philippe Cosenza, Jacques Desrues. Effect of claystone small-scale characteristics on the variability of micromechanical response and on microcracking modelling. 16th International Conference of IACMAG - International Association for Computer Methods and Advances in Geomechanics, May 2021, Turino, Italy. ⟨10.1007/978-3-030-64514-4_52⟩. ⟨hal-03066487⟩

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