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The Brittle-Ductile Transition in Porous Limestone Imaged by X-Ray Computed Tomography and Digital Image Correlation

Baud, Patrick; Hall, Stephen LU ; Ji, Yuntao; Wong, Teng-fong and Heap, Michael J. (2017) 6th Biot Conference on Poromechanics, Poromechanics 2017 In Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics p.1782-1788
Abstract

We studied the brittle-ductile transition in three porous carbonates, Indiana, USA, Majella, Italy, and Leitha, Austria, with porosity ranging between 16 and 31%. A series of triaxial experiments were performed at room temperature, constant strain rate, and at effective pressures ranging from 5 to 150 MPa. Several sets of X-ray Tomography images were acquired before and after deformation. 3D digital image correlation (DIC) was performed on the images of the intact and deformed samples. The use of 3D-volumetric DIC allowed us to map out the subtle development of strain localization associated with the transition from brittle faulting to cataclastic flow in the three limestones. Our observations showed that strain localization may develop... (More)

We studied the brittle-ductile transition in three porous carbonates, Indiana, USA, Majella, Italy, and Leitha, Austria, with porosity ranging between 16 and 31%. A series of triaxial experiments were performed at room temperature, constant strain rate, and at effective pressures ranging from 5 to 150 MPa. Several sets of X-ray Tomography images were acquired before and after deformation. 3D digital image correlation (DIC) was performed on the images of the intact and deformed samples. The use of 3D-volumetric DIC allowed us to map out the subtle development of strain localization associated with the transition from brittle faulting to cataclastic flow in the three limestones. Our observations showed that strain localization may develop at relatively small axial strains of ~1%, in both the brittle faulting and transitional regimes. In Majella limestone (porosity = 31%), the localized deformation involved both shear and compaction. Compaction bands were only observed in less cemented samples of Leitha limestone.

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Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
editor
Vandamme, Matthieu ; Dangla, Patrick ; Pereira, Jean-Michel ; Ghabezloo, Siavash ; ; ; and
pages
7 pages
publisher
American Society of Civil Engineers (ASCE)
conference name
6th Biot Conference on Poromechanics, Poromechanics 2017
external identifiers
  • scopus:85026290777
DOI
10.1061/9780784480779.220
language
English
LU publication?
yes
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8502881b-2fc4-4d60-92a2-4074fb9d0422
date added to LUP
2017-09-01 15:17:07
date last changed
2017-09-01 15:17:07
@inproceedings{8502881b-2fc4-4d60-92a2-4074fb9d0422,
  abstract     = {<p>We studied the brittle-ductile transition in three porous carbonates, Indiana, USA, Majella, Italy, and Leitha, Austria, with porosity ranging between 16 and 31%. A series of triaxial experiments were performed at room temperature, constant strain rate, and at effective pressures ranging from 5 to 150 MPa. Several sets of X-ray Tomography images were acquired before and after deformation. 3D digital image correlation (DIC) was performed on the images of the intact and deformed samples. The use of 3D-volumetric DIC allowed us to map out the subtle development of strain localization associated with the transition from brittle faulting to cataclastic flow in the three limestones. Our observations showed that strain localization may develop at relatively small axial strains of ~1%, in both the brittle faulting and transitional regimes. In Majella limestone (porosity = 31%), the localized deformation involved both shear and compaction. Compaction bands were only observed in less cemented samples of Leitha limestone.</p>},
  author       = {Baud, Patrick and Hall, Stephen and Ji, Yuntao and Wong, Teng-fong and Heap, Michael J.},
  booktitle    = {Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics},
  editor       = {Vandamme, Matthieu  and Dangla, Patrick  and Pereira, Jean-Michel  and Ghabezloo, Siavash },
  language     = {eng},
  pages        = {1782--1788},
  publisher    = {American Society of Civil Engineers (ASCE)},
  title        = {The Brittle-Ductile Transition in Porous Limestone Imaged by X-Ray Computed Tomography and Digital Image Correlation},
  url          = {http://dx.doi.org/10.1061/9780784480779.220},
  year         = {2017},
}