Thermo-mechanical coupling in cracked granite:Influence of crack inclination on fracture behavior and temperature evolutionOA
Crack inclination angle(α)plays a critical role in the dynamic failure and thermo-mechanical coupling of granite,which is vital for rockburst monitoring and prevention.In this study,granite specimens with various prefabricated crack inclinations(α=0°,30°,60°,90°)were tested using a split Hopkinson pressure bar(SHPB)system.Transient crack tip temperatures were monitored in real time by high-speed infrared thermography,and crack propagation was analyzed using digital image correlation(DIC).The results show that:1)Propagation mode and mechanical properties:Increasing crack inclination causes a transition from pure tensile propagation to tension–shear mixed modes.Atα=60°,enhanced shear promotes branching cracks,while atα=90°,crack closure suppresses propagation and induces localized damage.2)Strength characteristics:Peak stress exhibits a“U-shaped”trend with respect toα,reaching the lowest value atα=60°.3)Thermal response:Crack tip temperature rise is strongly dependent on inclination.The maximum rise(up to 9.266℃)occurs atα=30°and 60°due to pronounced tension-shear coupling and frictional slip,whereasα=0°and 90°show smaller increases.4)Two-stage temperature evolution:Before peak stress,~80%of the temperature rise originates from plastic work;after peak stress,crack slip and friction dominate,leading to accelerated heating.5)Crack tip temperature rise serves as a sensitive indicator of local energy concentration and disaster risk,providing theoretical support for monitoring and prevention strategies in deep mining.
Chenrui Huang;Chaomin Mu;Fei Wang;Yangyong Wu
School of Mining Engineering,Anhui University of Science and Technology,Huainan,232001,China School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan,232001,China State Key Laboratory of Digital and Intelligent Technology for Unmanned Coal Mining,Anhui University of Science and Technology,Huainan,232001,ChinaSchool of Safety Science and Engineering,Anhui University of Science and Technology,Huainan,232001,China State Key Laboratory of Digital and Intelligent Technology for Unmanned Coal Mining,Anhui University of Science and Technology,Huainan,232001,ChinaState Key Laboratory of Digital and Intelligent Technology for Unmanned Coal Mining,Anhui University of Science and Technology,Huainan,232001,ChinaSchool of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan,232001,China
建筑与水利
Prefabricated crackInfrared temperature measurementCrack tip temperatureThermo-mechanical coupling
《Rock Mechanics Bulletin》 2026 (2)
P.89-100,12
the financial support from National Key Research and Development Program of China(No.2021YFC3100802)Anhui Engineering Research Center of New Explosive Materials and Blasting Technology(No.AHBP2023B-09)。
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