Abstract
We propose a new digital image correlation (DIC)-based method to calculate the location of a fracture process zone (FPZ) tip. Accordingly, we measure the FPZ length and crack opening displacement of heat-treated granite specimens. When the heat treatment temperature is below 300 ℃, the FPZ is fully developed between the peak and 90% post-peak load. When the heat treatment temperature exceeds 300 ℃, the FPZ is fully developed at peak load. The FPZ length at peak load increases bilinearly as a function of the thermal treatment temperature and exhibits an inflection point at 300 ℃. The critical crack tip opening displacement increases parabolically as a function of the heat treatment temperature.
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