Challenges and solutions of 2D Digital Image Correlation for Brazilian Tensile Strength testing on hard rock
Émélie Gagnon, Timothy R Packulak, Samuel K Woodland, Mark S Diederichs, Jennifer J Day
In the proceedings of: GeoSaskatoon 2023: 76th Canadian Geotechnical ConferenceSession: Rock Mechanics 1
ABSTRACT: Brazilian tensile strength (BTS) testing is crucial for hard rock engineering projects. Despite being uncommon, there is growing interest in monitoring strain during the test to assess true tensile strength, analyze geological effects, and study fracture development. Given the heterogeneous strain fields in BTS tests, obtaining full-field strain maps using affordable Digital Image Correlation (DIC) is preferred over limited-coverage foil strain gauge measurements (SG). However, applying DIC in BTS testing is challenging due to the small strain expected in hard, low porosity rock (below 0.1% or 0.005 mm in a 50-mm diameter specimen). This paper offers technical guidance on employing two-dimensional (2D) DIC in BTS laboratory testing of hard rocks, covering hardware selection and speckle pattern application. It presents validation results from a testing program that equipped BTS specimens with a lateral strain gauge on one side and DIC on the other.
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Gagnon, Émélie, Packulak, Timothy R, Woodland, Samuel K, Diederichs, Mark S, Day, Jennifer J (2023) Challenges and solutions of 2D Digital Image Correlation for Brazilian Tensile Strength testing on hard rock in GEO2023. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Gagnon_GEO2023_73,
author = {{Gagnon, Émélie}, {Packulak, Timothy R}, {Woodland, Samuel K}, {Diederichs, Mark S}, {Day, Jennifer J}}
title = {Challenges and solutions of 2D Digital Image Correlation for Brazilian Tensile Strength testing on hard rock }
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {Challenges and solutions of 2D Digital Image Correlation for Brazilian Tensile Strength testing on hard rock }
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }