Evolution of tensile and shear cracking in crystalline rocks under compression

Zafar, Sana; Hedayat, Ahmadreza; Moradian, Omid

doi:10.1016/j.tafmec.2022.103254

Evolution of tensile and shear cracking in crystalline rocks under compression

Journal Article · Sat Jan 22 04:00:00 EST 2022 · Theoretical and Applied Fracture Mechanics

DOI:https://doi.org/10.1016/j.tafmec.2022.103254· OSTI ID:1977683

Zafar, Sana ^[1]; Hedayat, Ahmadreza ^[2]; Moradian, Omid ^[3]

Colorado School of Mines, Golden, CO (United States); OSTI
Colorado School of Mines, Golden, CO (United States)
Swiss Federal Institute of Technology, Zurich (Switzerland)

Here we performed laboratory-scale unconfined compression experiments on Barre granite specimen with a single pre-existing flaw to study the evolution of tensile and shear cracking that occurs during different stress levels. Moment tensor inversion of acoustic emission (AE) events in combination with the nonelastic strain component obtained through the 2D digital image correlation (DIC) technique are used to track the changes in the source mechanisms of the stress-induced cracks. The mode of deformation computed from the image based strain profiles, enables visual comparison of the nucleation, growth and interaction of the tensile and shear cracks with the microseismic source mechanism observed by moment tensor inversion of the AE events. Comparing the results obtained from the two techniques on the same dataset demonstrates a quantitative correlation between the acoustic and visual observations in terms of the cracking mechanisms obtained at different stages of cracking from crack initiation at the flaw tips to the failure of the rock specimen.

View Accepted Manuscript (DOE)

Research Organization:: Colorado School of Mines, Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019117

OSTI ID:: 1977683

Alternate ID(s):: OSTI ID: 1862501

Journal Information:: Theoretical and Applied Fracture Mechanics, Journal Name: Theoretical and Applied Fracture Mechanics Journal Issue: C Vol. 118; ISSN 0167-8442

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
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non-elastic tensile strain
uniaxial compression

Evolution of tensile and shear cracking in crystalline rocks under compression

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