Digital image correlation analysis of crack initiation and failure in heat-treated granite during the Brazilian test

doi:10.1016/j.geothermics.2024.103042

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Digital image correlation analysis of crack initiation and failure in heat-treated granite during the Brazilian test
	Yang, Zheyi; Wu, Jinwen; Cui ZH(崔哲华); Qiu, Yongfeng; Song, Gaoying; Ma, Yiming; Feng, Zijun; Du, Menglin; Geng, Shaobo; Chen, Shuping
刊名	GEOTHERMICS
	2024-07-01
卷号	121 页码:15
关键词	Heat-treatment Crack opening displacement Digital image correlation Brazilian splitting test
ISSN号	0375-6505
DOI	10.1016/j.geothermics.2024.103042
通讯作者	Wu, Jinwen(wujinwen1982@163.com) ; Feng, Zijun(fengzijun@tyut.edu.cn)
英文摘要	Accurately and quantitatively investigating the progression of macro failure cracks in thermal storage rock masses is crucial to ensuring the safe operation of enhanced geothermal systems (EGS). In this study, we employed the digital image correlation method (DIC) to systematically monitor the development of strain and displacement fields in heat -treated granite during Brazilian splitting tests. The deformation process of the specimen can be categorized into three distinct stages: the elastic stage, the plastic deformation stage (involving the formation and development of the fracture process zone (FPZ)), and the failure stage. As the temperature of heat treatment increases, the elastic stage gradually shortens, the plastic stage extends, and the load level at the elastic -plastic transition point ( P E -F ) gradually decreases. Also, the post -peak load failure stage becomes more distinct, attributed to the increased ductility of the material. The crack opening displacement (COD) values at the transition point P E -F (COD b ) under various temperatures consistently fall within the range of 1-13 mu m. The COD at the peak load (COD c ) follows a parabolic trend with temperature. Specifically, the average COD c at 500 degrees C is about 2.21 times higher than that at 25 degrees C, and it is about 20.46 times greater at 1000 degrees C than at 25 degrees C. This temperature -dependent behavior signifies a transition in the rock ' s failure mechanism, beginning to shift from brittle fracture to ductile fracture between the temperature range of 500-600 degrees C.
分类号	二类/Q1
资助项目	National Natural Science Foundation of China[51504220] ; National Natural Science Foundation of China[52122405]
WOS关键词	FRACTURE PROCESS ZONE ; THERMAL-DAMAGE ; TENSILE-STRENGTH ; MECHANICAL-BEHAVIOR ; HIGH-TEMPERATURE ; ROCK ; PERMEABILITY ; DEFORMATION ; COALESCENCE ; EVOLUTION
WOS研究方向	Energy & Fuels ; Geology
语种	英语
WOS记录号	WOS:001239952700001
资助机构	National Natural Science Foundation of China
其他责任者	Wu, Jinwen ; Feng, Zijun
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/95596]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
推荐引用方式 GB/T 7714	Yang, Zheyi,Wu, Jinwen,Cui ZH,et al. Digital image correlation analysis of crack initiation and failure in heat-treated granite during the Brazilian test[J]. GEOTHERMICS,2024,121:15.
APA	Yang, Zheyi.,Wu, Jinwen.,崔哲华.,Qiu, Yongfeng.,Song, Gaoying.,...&Chen, Shuping.(2024).Digital image correlation analysis of crack initiation and failure in heat-treated granite during the Brazilian test.GEOTHERMICS,121,15.
MLA	Yang, Zheyi,et al."Digital image correlation analysis of crack initiation and failure in heat-treated granite during the Brazilian test".GEOTHERMICS 121(2024):15.