Investigation of fracture process zone properties of mode I fracture in heat-treated granite through digital image correlation. (August 2020)

• Record Type: Journal Article
• Authors: Wu, Jinwen; Gao, Jingwu; Feng, Zijun; Chen, Shuping; Nie, Taoyi
• Is Part Of: Engineering fracture mechanics. Volume 235(2020)
• Publication Date: 2020-08
• Subjects: Fracture process zone -- Crack opening displacement -- Digital image correlation -- Rock mechanics; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2020.107192
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: FPZ length at peak load increases bilinearly with temperature T. The inflection point of bilinearly relation appears at 300 °C. CTODc increases quadratically with increase of T. 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.