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.

中文翻译：

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热处理花岗岩I型断裂断裂过程带特性的数字图像相关研究

摘要 我们提出了一种新的基于数字图像相关 (DIC) 的方法来计算断裂过程区 (FPZ) 尖端的位置。因此，我们测量了热处理花岗岩试样的 FPZ 长度和裂纹张开位移。当热处理温度低于300℃时，FPZ在峰值和90%的峰值后载荷之间充分发展。当热处理温度超过300℃时，FPZ在峰值载荷下充分发育。峰值载荷下的 FPZ 长度作为热处理温度的函数呈双线性增加，并在 300 ℃ 出现拐点。临界裂纹尖端张开位移随热处理温度呈抛物线状增加。