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Type: Journal article
Title: Specimen aspect ratio and progressive field strain development of sandstone under uniaxial compression by three-dimensional digital image correlation
Author: Munoz, H.
Taheri, A.
Citation: Journal of Rock Mechanics and Geotechnical Engineering, 2017; 9(4):599-610
Publisher: Elsevier
Issue Date: 2017
ISSN: 1674-7755
Statement of
H. Munoz, A. Taheri
Abstract: The complete stressestrain characteristics of sandstone specimens were investigated in a series of quasistatic monotonic uniaxial compression tests. Strain patterns development during pre- and post-peak behaviours in specimens with different aspect ratios was also examined. Peak stress, post-peak portion of stressestrain, brittleness, characteristics of progressive localisation and field strain patterns development were affected at different extents by specimen aspect ratio. Strain patterns of the rocks were obtained by applying three-dimensional (3D) digital image correlation (DIC) technique. Unlike conventional strain measurement using strain gauges attached to specimen, 3D DIC allowed not only measuring large strains, but more importantly, mapping the development of field strain throughout the compression test, i.e. in pre- and post-peak regimes. Field strain development in the surface of rock specimen suggests that strain starts localising progressively and develops at a lower rate in pre-peak regime. However, in post-peak regime, strains increase at different rates as local deformations take place at different extents in the vicinity and outside the localised zone. The extent of localised strains together with the rate of strain localisation is associated with the increase in rate of strength degradation. Strain localisation and local inelastic unloading outside the localised zone both feature post-peak regime.
Keywords: Uniaxial compression test; aspect ratio; strain patterns; digital image correlation (DIC)
Rights: © 2017 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( licenses/by-nc-nd/4.0/
DOI: 10.1016/j.jrmge.2017.01.005
Appears in Collections:Aurora harvest 3
Civil and Environmental Engineering publications

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