Mixed-mode I + II tensile fracture analysis of thermally treated granite using straight-through notch Brazilian disc specimens

Yin, Tubing; Wu, You; Wang, Chao; Zhuang, Dengdeng; Wu, Bingqiang

doi:10.1016/j.engfracmech.2020.107111

Cited by 64 publications

(17 citation statements)

References 74 publications

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“…Due to the needs of nuclear waste storage, geothermal resource development, and many other engineering constructions [1][2][3][4][5][6][7][8], the mechanical properties of rocks after high temperature have caused extensive research by scholars.…”

Section: Introductionmentioning

confidence: 99%

The Size Effect and Microstructure Changes of Granite after Heat Treatment

Zhang

Song

et al. 2021

Advances in Materials Science and Engineering

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High temperature can change the mechanical properties of granite, with significant nonlinear characteristics, and at the same time change its microstructure. Therefore, two kinds of granites are used in this paper: one is normal temperature granite and the other is granite treated at 600°C, and a detailed comparative study is made. The fracture toughness of two kinds of rocks was tested by fracture tests, and the results were analyzed by a nonlinear fracture mechanics model (SEL). At the same time, in order to understand the influence of high temperature on the mineral composition and microstructure of granite, XRD, optical microscope, and SEM were used to observe the mineral composition, microcracks, and fracture morphology of granite. The results show the following: (1) high temperature significantly changes the fracture mechanics parameters of granite. The fracture toughness of granite treated at 600°C is significantly lower than that of untreated granite, which is reduced by more than 60%. (2) No obvious size effect was found in the untreated granite, while the size effect of the granite after treatment at 600°C was significant. (3) The granite after high-temperature treatment showed strong nonlinear characteristics, and the SEL can reasonably describe and explain its nonlinear fracture characteristics. (4) The brittleness of the granite treated at 600°C decreased and the ductility increased. The microscopic morphology of the fracture was rough, with obvious steps and rivers. The microcracks and porosity had increased significantly, but the main components did not change significantly.

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Section: Introductionmentioning

confidence: 99%

The Size Effect and Microstructure Changes of Granite after Heat Treatment

Zhang

Song

et al. 2021

Advances in Materials Science and Engineering

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“…Garrido et al 12 forecasted the uniaxial compressive strength of limestone at high temperature based on the tests of point load and leeb rebound hardness. Yin et al 5 conducted a series of mixed‐mode I and II fracture tests to analyze the evolution characteristics of fracture toughness for thermally treated granite. Huang et al 30 investigated the effects of thermal shock on the fracture characteristics of flaw‐contained granite specimens subjected to uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, some technologies, such as CT, SEM, and NMR, can only observe the change of internal structure of rocks inducted by the thermal fatigue damage 19,23,27 . AE is defined as the transient wave generated from the rapid release of localized energy, which is closely related to the fracture damage within rocks 5,11,34,35 . Previous studies 36–39 indicated that the dominate frequency characteristics of AE waveform obtained by Fast Fourier Transformation (FFT) are closely sensitive to the microfracture mechanism of rocks.…”

Section: Introductionmentioning

confidence: 99%

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

Niu

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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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 physicalmechanical 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. K E Y W O R D S acoustic emission, dominant frequency, failure mechanism, high-temperature treatment, thermal fatigue damage, uniaxial compression 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.

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“…For mode I, common testing methods mainly include short rod (SR), 7 chevron bend (CB), 7 cracked chevron notched Brazilian disc (CCNBD), 8 semi-circular bend (SCB), 9,10 and double torsion (DT), 11 in which first four kinds of methods had been suggested by the International Society for Rock Mechanics (ISRM) to determine the mode I fracture toughness. For mode II, measuring methods mostly contain anti-symmetric four-point bending (ASFPB) (Figure 1A), 12,13 cracked straight-through Brazilian disc (CSTBD) (Figure 1B), 14,15 the double-edge notched Brazilian disk (DNBD) (Figure 1C), 16 semicircular bend (SCB) with inclined notch (Figure 1D), 17 U-notched Brazilian disc (UNBD) (Figure 1E), 18 shear box test (Figure 1F), 19 short beam in compression (SBC) (Figure 1G), 20,21 short core in compression (SCC) (Figure 1H), 21,22 and punch-through shear (PTS) (Figure 1I), 23 in which the last method had been suggested by the ISRM to determine the mode II fracture toughness. 3 The fracture toughness testing methods for mode III are less numerous than that for mode I and mode II, and mainly include cylinder torsion (CT), 24 split cantilever beam (SCB), 25 anti-clastic plate bending (ACPB), 26 and edge notched disc bend (ENDB).…”

Section: Introductionmentioning

confidence: 99%

Deformation and fracture behavior of granite by the short core in compression method with 3D digital image correlation

Zhang

Zhu

et al. 2021

Fatigue Fract Eng Mat Struct

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Based on three‐dimensional digital image correlation (3D‐DIC) technique, the deformation behavior, damage and fracture characteristics of the granite specimens have been tested and observed by the short core in compression (SCC) method. The test results show that (1) the damage degree of rock in the region of interest (ROI) increases with axial stress. Before peak stress, damage factor based on apparent principal strain increases slowly, then rises rapidly; (2) relative displacements in both horizontal and vertical directions are observed, indicating that the fracture mode for SCC specimens subjected to uniaxial compression is the tensile‐shear mixed mode fracture; (3) new fracture initiates from the middle part of the expected shear fracture band (ESFB) then propagates along the loading direction. A dominant macro‐fracture, linking up the tips of two notches, eventually forms. Meanwhile, a calculation method based on the energy conservation law for the fracture energy of SCC specimens is proposed. The fracture energy of granite is estimated as 1760.4 J/m2.

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Mixed-mode I + II tensile fracture analysis of thermally treated granite using straight-through notch Brazilian disc specimens

Cited by 64 publications

References 74 publications

The Size Effect and Microstructure Changes of Granite after Heat Treatment

The Size Effect and Microstructure Changes of Granite after Heat Treatment

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

Deformation and fracture behavior of granite by the short core in compression method with 3D digital image correlation

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