Abstract
This study is aimed at revealing the mechanism of microcrack growth in a sandstone subjected to a uniaxial stress state. Next to direct observation of microcracks in our SEM study, we have determined width of grain boundaries by means of a manually controlled image processing procedure. By comparing deformed with undeformed rock, we have found strong evidence that, in the well cemented sandstone that we have studied, inter granular crack growth is the main change in the microstructure that occurs during pre-failure deformation. It requires further research to determine the precise underlying micromechanism of deformation.
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