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Experimental study on thermal fatigue damage and failure mechanisms of basalt exposed to high‐temperature treatments.

Authors :
Niu, Yong
Wang, Gang
Wang, Jinguo
Liu, Xiqi
Zhang, Ranran
Qiao, Jiaxing
Zhang, Jianzhi
Source :
Fatigue & Fracture of Engineering Materials & Structures; Aug2023, Vol. 46 Issue 8, p2909-2928, 20p
Publication Year :
2023

Abstract

Understanding the effects of thermal fatigue damage on the failure mechanisms of rocks is a key concern in underground engineering. The effects of high temperature on the physical–mechanical behaviors and the failure mechanism of basalt under uniaxial compression are investigated with a combination of acoustic emission (AE), computed tomography (CT), and scanning electron microscope (SEM). The high temperature heavily affects the physical–mechanical properties of basalt but has no effect on the mineral compositions. The evolution characteristics of inter‐event time function F(τ) and cumulative AE energy can be employed to characterize the fracture process of thermally damaged basalt. The damage mechanisms of thermal fatigue are attributed to the occurrence of intergranular cracks, intragranular cracks, and transgranular cracks and irregular holes within basalt. The failure mechanisms of basalt change from shear fracture to mixed tensile–shear fracture and finally to tensile fracture based on the statistical characteristics of low and high dominant frequencies. Highlights: The thermal fatigue effects on the physical–mechanical behaviors of basalt are studied.The relationship between failure process and AE characteristics is constructed.The damage mechanisms of thermal fatigue for basalt are revealed.The failure mechanisms of basalt under uniaxial compression are revealed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
8756758X
Volume :
46
Issue :
8
Database :
Complementary Index
Journal :
Fatigue & Fracture of Engineering Materials & Structures
Publication Type :
Academic Journal
Accession number :
164878252
Full Text :
https://doi.org/10.1111/ffe.14052