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Experimental and theoretical investigations on the effect of cyclic thermal shocking on damage evolution and fracture mode classification in granite based on acousto-optic-magnetic-mechanical method
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DOI：10.1016/j.jobe.2026.117032.png)
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Abstract
En 中文
• Combined acousto-optic-magnetic-mechanical method reveals cyclic thermal shock significantly degrades Beishan granite, with water cooling causing the most severe damage and fracture network formation above 600 °C. • Tensile strength decreases markedly with rising temperature and thermal cycles; the failure mode transitions from tensile-dominated to tensile-shear mixed, as evidenced by AE-based RA-AF, KDE, and k-means clustering. • NMR T2 spectra and transverse imaging demonstrate that rapid cooling promotes interconnected microcracks and pore-coalesced fracture systems, while slow cooling better preserves structural integrity. • Cyclic thermal loading accelerates damage accumulation and microcrack connectivity, increasing AE activity and shifting b-values toward higher proportions of small-scale cracking. • Integrated AE, DIC, NMR, and SEM provide a multi-scale understanding from microcrack initiation to macroscopic failure, offering practical guidance for cooling strategy optimization in high-temperature rock engineering.
Keywords:
Beishan granite
Cyclic thermal shock
Damage evolution
Fracture mode classification
Acousto-optic-magnetic-mechanical method
Journal
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7.4
Papers:
1.6W
Citations:
6.6W
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