Abstract
The purpose of this paper is to investigate the fracture modes of the crack propagation of fourteen sandstone samples under Cracked Chevron Notch Brazilian Disc (CCNBD) test conditions through the use of image analysis and the high speed camera. The fracture mode is characterized by the displacement of 0.5mm glass beads placed on the sandstone surface relative to the approximate orientation of the fracture propagation. Using a Phantom v2011 High Speed Camera the fracture generation and propagation of the samples are recorded and processed for image analysis. ImageJ with Multi-Tracker and Manual Tracker, as well MATLAB® software were used to analyze the movement of particles during fracture propagation. It was found that the ImageJ software was able to track the movement of the particles and the output of the MATLAB® script was able to plot vector trajectories of the particles. For the analysis of samples tested under different orientations it was found that both shear mode and mixed-mode were evident in the fracture propagation.
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