文献类型：期刊文献

英文题名：Experimental study on cracking process and fracture properties of granite under mode I loading by acoustic emission and digital image correlation

作者：Xue, Fei[1];Lin, Zhongqin[1];Wang, Tianzuo[1,2]

机构：[1]Shaoxing Univ, Coll Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Peoples R China;[2]Shaoxing Univ, Coll Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China

年份：0

外文期刊名：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录：SCI-EXPANDED(收录号：WOS:000943375200001)、、EI(收录号：20231113698214)、Scopus(收录号：2-s2.0-85149532079)、WOS

基金：ACKNOWLEDGMENTS The authors would like to acknowledge the financial support for this study provided by National Natural Science Foundation of China (Grant No. 52104094), China Postdoctoral Science Foundation (Grant No. 2022M721997) and Zhejiang Provincial Natural Science Foundation of China (Grant No. LGJ22D020001).

语种：英文

外文关键词：fracture mechanics; crack tip opening displacement; fracture process zone; acoustic emission; digital image correlation

外文摘要：To explore mode-I fracture process of hard brittle rocks, semi-circular bending (SCB) experiments were performed with the concurrent monitoring of acoustic emission (AE) and digital image correlation (DIC). Experimental results revealed that all specimens exhibited ductile fracture characteristic and the fracture planes deviated from the ligament plane to different degrees due to interference from mineral crystals or pre-existing weak surfaces within the intergranular boundaries. The whole cracking process can be divided into four stages: Microcrack initiation preparation, microcrack initiation and stable propagation, macrocrack formation and unstable propagation, and macrocrack coalescence. The onset of the microcrack initiation occurred at about pre-80% load. The fracture process zone (FPZ) maintained a constant length as the crack propagated and the length of the traction free zone (TFZ) increased. The identified crack lengths based on the AE locations and energy statistical analysis consisted well with the crack lengths obtained from the DIC.