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\begin{document}

\title{Investigation of the Stress-induced Microcracking Processes in
Crystalline Rocks through Simultaneous Acoustic Emission and Strain
Monitoring}



\author[1]{Sana Zafar}%
\author[1]{Ahmadreza Hedayat}%
\author[2]{Omid Moradian}%
\affil[1]{Colorado School of Mines}%
\affil[2]{ETH Zürich}%


\vspace{-1em}



  
  \date{May 23, 2024}


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\begin{abstract}
We performed laboratory-scale experiments on Barre granite specimen with
a single pre-existing flaw to study the microscopic processes that occur
during the deformation of a brittle material such as granite at
different stress levels from crack initiation to the failure of the
specimen. Here, we focus on the evolution of the tensile and shear
cracks as a function of stress under unconfined compression. Acoustic
emission technique (AET) in combination with the two dimensional (2-D)
digital image correlation (DIC) technique have been used to track the
changes in the source mechanisms of the registered AE events, along with
the development of strains around the flaw tips of a uniaxially loaded
prismatic Barre granite specimen. The parametric analysis along with the
moment tensor inversion of the AE signals were used to discuss the
cracking levels and the cracking mechanisms. In particular, the
microcracks observed through AE monitoring prior to specimen failure
were presented in terms of their spatio-temporal evolution and linked
with the changes in the inelastic strain component measured through the
2D-DIC along the localized area. The mode of deformation computed from
the image based strain profiles, enabled direct comparison of the
nucleation, growth and interaction of the microcracks with the AE
monitoring technique.%
\end{abstract}%



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