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Latifi, Sh., Hosseini, M., Mahdikhani, M.. (1400). The Effect of Temperature and Heating–Cooling Cycles on Mode I, Mode II and Mixed-Mode I-II Fracture Toughness of Sandstone. لسان مبین, 6(1), 53-69. doi: 10.30479/jmre.2021.14434.1459
Sh. Latifi; M. Hosseini; M. Mahdikhani. "The Effect of Temperature and Heating–Cooling Cycles on Mode I, Mode II and Mixed-Mode I-II Fracture Toughness of Sandstone". لسان مبین, 6, 1, 1400, 53-69. doi: 10.30479/jmre.2021.14434.1459
Latifi, Sh., Hosseini, M., Mahdikhani, M.. (1400). 'The Effect of Temperature and Heating–Cooling Cycles on Mode I, Mode II and Mixed-Mode I-II Fracture Toughness of Sandstone', لسان مبین, 6(1), pp. 53-69. doi: 10.30479/jmre.2021.14434.1459
Latifi, Sh., Hosseini, M., Mahdikhani, M.. The Effect of Temperature and Heating–Cooling Cycles on Mode I, Mode II and Mixed-Mode I-II Fracture Toughness of Sandstone. لسان مبین, 1400; 6(1): 53-69. doi: 10.30479/jmre.2021.14434.1459

The Effect of Temperature and Heating–Cooling Cycles on Mode I, Mode II and Mixed-Mode I-II Fracture Toughness of Sandstone

نشریه مهندسی منابع معدنی
مقاله 5، دوره 6، شماره 1 - شماره پیاپی 19، فروردین 1400، صفحه 53-69  XML اصل مقاله (1.13 M)
نوع مقاله: علمی-پژوهشی
شناسه دیجیتال (DOI): 10.30479/jmre.2021.14434.1459
نویسندگان
Sh. Latifi1؛ M. Hosseini email 2؛ M. Mahdikhani3
1M.Sc Student, Dept. of Mining Engineering, Imam Khomeini International University, Qazvin, Iran
2Associate Professor, Dept. of Mining Engineering, Imam Khomeini International University, Qazvin, Iran
3Assistant Professor, Dept. of Civil Engineering, Imam Khomeini International University, Qazvin, Iran
تاریخ دریافت: 05 آبان 1399،  تاریخ بازنگری: 24 اسفند 1399،  تاریخ پذیرش: 24 اسفند 1399 
چکیده
In the case of explosions and fires, the rocks undergo a cycle of heating and cooling. For that, first, they are exposed to considerable heat and then cooled after extinguishing the fire. Temperature variations and subsequent contraction and expansion affect the physical and mechanical properties of rocks. Through two series of tests, the effects of temperature and the number of heating-cooling cycles on the mode I, mode II and the effective mixed-mode I-II fracture toughness of Lushan sandstone were investigated. In the first series, the effect of temperature was studied in a heating–cooling cycle at ambient temperature (25°C) and 60, 150, 200, 300, 500, and 700°C. The highest and lowest mode I, mode II and the effective mixed-mode I-II fracture toughness were, observed at 150 and 700°C, respectively. In the second series of tests, the effect of the number of heating–cooling cycles was investigated on the mode I, mode II and the effective mixed-mode I-II fracture toughness of sandstone specimens at 150°C (for hydraulic fracturing modeling) and a crack inclination angle of 45°. According to the results, the mode I, mode II and the effective mixed-mode I-II fracture toughness increased in the first cycle and decreased with increasing the number of heating–cooling cycles. As the crack inclination increased, the effective mixed-mode I-II fracture toughness of the sandstone specimens increased. The mode II fracture toughness increased up to a crack inclination angle of 45° and then decreased. Moreover, the mode of fracture changes from opening mode (mode I) at the crack inclination angle of zero degree to mixed mode (tension-shear) at the crack inclination angle of less than 28.8°. The mode of fracture changes from tensile-shear to compression-shear at the crack inclination angle of greater than 28.8°.
کلیدواژه‌ها
Fracture toughness؛ Heating–cooling cycle؛ Mixed-mode؛ Sandstone؛ Crack inclination angle
عنوان مقاله [English]
The Effect of Temperature and Heating–Cooling Cycles on Mode I, Mode II and Mixed-Mode I-II Fracture Toughness of Sandstone
نویسندگان [English]
Sh. Latifi1؛ M. Hosseini2؛ M. Mahdikhani3
1M.Sc Student, Dept. of Mining Engineering, Imam Khomeini International University, Qazvin, Iran
2Associate Professor, Dept. of Mining Engineering, Imam Khomeini International University, Qazvin, Iran
3Assistant Professor, Dept. of Civil Engineering, Imam Khomeini International University, Qazvin, Iran
چکیده [English]
In the case of explosions and fires, the rocks undergo a cycle of heating and cooling. For that, first, they are exposed to considerable heat and then cooled after extinguishing the fire. Temperature variations and subsequent contraction and expansion affect the physical and mechanical properties of rocks. Through two series of tests, the effects of temperature and the number of heating-cooling cycles on the mode I, mode II and the effective mixed-mode I-II fracture toughness of Lushan sandstone were investigated. In the first series, the effect of temperature was studied in a heating–cooling cycle at ambient temperature (25°C) and 60, 150, 200, 300, 500, and 700°C. The highest and lowest mode I, mode II and the effective mixed-mode I-II fracture toughness were, observed at 150 and 700°C, respectively. In the second series of tests, the effect of the number of heating–cooling cycles was investigated on the mode I, mode II and the effective mixed-mode I-II fracture toughness of sandstone specimens at 150°C (for hydraulic fracturing modeling) and a crack inclination angle of 45°. According to the results, the mode I, mode II and the effective mixed-mode I-II fracture toughness increased in the first cycle and decreased with increasing the number of heating–cooling cycles. As the crack inclination increased, the effective mixed-mode I-II fracture toughness of the sandstone specimens increased. The mode II fracture toughness increased up to a crack inclination angle of 45° and then decreased. Moreover, the mode of fracture changes from opening mode (mode I) at the crack inclination angle of zero degree to mixed mode (tension-shear) at the crack inclination angle of less than 28.8°. The mode of fracture changes from tensile-shear to compression-shear at the crack inclination angle of greater than 28.8°.
کلیدواژه‌ها [English]
Fracture toughness, Heating–cooling cycle, Mixed-mode, Sandstone, Crack inclination angle
مراجع

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