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Communication dans un congrès

Mechanical evolution of an altered limestone using 2D and 3D digital image correlation (DIC)

Abstract : In the context of long term CO 2 sequestration, we present an original laboratory workflow which allows a multiscale analysis of the effect of a chemical alteration on both petrophysical and mechanical properties of a carbonate. The relation between the mechanical behavior and the microstructural evolutions is investigated using the digital image correlation techniques. For this purpose we imaged intact and altered samples during uniaxial and triaxial mechanical tests using optical microscopy, scanning electron microscopy and 3D X-ray microtomography. The porosity increase induced by homogeneous alteration leads to lower elastic moduli and critical stress at sample failure. Furthermore at a same confining pressure we observed a transition from brittle to ductile failure mechanisms with the increase of alteration level. These observations are evidenced by digital image correlation. Altered samples evidenced early strain localization which was not observed in the intact ones. These early localization events induce more compaction at the macroscopic scale and tend to initiate early fracturing.
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Communication dans un congrès
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https://hal-enpc.archives-ouvertes.fr/hal-01579348
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Soumis le : lundi 25 avril 2022 - 16:06:27
Dernière modification le : jeudi 28 avril 2022 - 13:47:24

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Zinsmeister2013.pdf
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Distributed under a Creative Commons Paternité - Pas d'utilisation commerciale 4.0 International License

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  • HAL Id : hal-01579348, version 1

Citation

Louis Zinsmeister, Jérémie Dautriat, Alexandre Dimanov, Jean Raphanel, Michel Bornert. Mechanical evolution of an altered limestone using 2D and 3D digital image correlation (DIC). 47th US Rock Mechanics / Geomechanics Symposium, Jun 2013, San Francisco, United States. ⟨hal-01579348⟩

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