Experimental study on fracture properties of heat-treated granite in I-II mixed mode suffered from water and liquid nitrogen cooling methods

IF 4.7 2区 工程技术 Q1 MECHANICS Engineering Fracture Mechanics Pub Date : 2024-10-18 DOI:10.1016/j.engfracmech.2024.110570
Yao Li , Lei Zhou , Xiaodong Xiao , Xian Liang , Haohan Wang , Hongdan Zhang , Bang Liu
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Abstract

Hot dry rock (HDR) development is significant for solving energy problems and realizing energy conservation and emission reduction. Liquid nitrogen (LN2) fracturing and hydraulic fracturing can form cracks in the HDR and improve the efficiency of geothermal energy mining. Therefore, it is necessary to study the fracture characteristics of high-temperature granite under different cooling methods. In this study, the deterioration of the physical and mechanical properties of granite subjected to high-temperature treatment under water cooling and LN2 cooling was studied. Two I/II mixed modes (tensile orientation mode and shear orientation mode) and a pure II mode fracture characteristics of cracked straight-through Brazilian disc (CSTBD) specimens made of granite were explored. The displacement and strain fields of cracked granite specimens were measured by using a digital image correlation (DIC) method. The results show that when the temperature is 25℃, 200℃, and 400℃, the loading angle and cooling method have a great influence on the fracture mechanical characteristics of the granite. In general, the increase of loading angle and LN2 cooling will lead to the decrease of peak load. For example, at 200℃, β = 15°, the deterioration degree of water-cooled and LN2-cooled specimens is 13.77 % and 16.69 %, respectively. When β = 23°, it increases to 14.62 % and 19.91 %, respectively. At the same time, an interesting phenomenon was found in the study. At 400℃, due to the Leidenfrost effect, the peak load of LN2-cooled specimens was higher than that of water-cooled specimens, and the further increase of temperature weakened the effect. When the temperature is 600℃, the difference between the loading angle and the cooling method is weakened.
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水和液氮冷却方法导致 I-II 混合模式热处理花岗岩断裂特性的实验研究
干热岩(HDR)开发对解决能源问题、实现节能减排意义重大。液氮(LN2)压裂和水力压裂可以在高温干岩体中形成裂缝,提高地热能开采效率。因此,有必要研究高温花岗岩在不同冷却方式下的断裂特征。在本研究中,研究了在水冷和 LN2 冷却条件下,经过高温处理的花岗岩的物理和机械性能的恶化情况。研究了花岗岩直通巴西圆盘(CSTBD)裂纹试样的两种 I/II 混合模式(拉伸取向模式和剪切取向模式)和纯 II 模式断裂特征。采用数字图像相关(DIC)方法测量了开裂花岗岩试样的位移和应变场。结果表明,当温度为 25℃、200℃ 和 400℃时,加载角度和冷却方式对花岗岩的断裂力学特性有很大影响。一般来说,加载角度和 LN2 冷却方式的增加会导致峰值载荷的降低。例如,在 200℃、β = 15° 时,水冷试样和 LN2 冷却试样的劣化程度分别为 13.77 % 和 16.69 %。当 β = 23° 时,恶化程度分别增加到 14.62 % 和 19.91 %。同时,研究还发现了一个有趣的现象。在 400℃时,由于莱顿弗罗斯特效应,LN2 冷却试样的峰值载荷高于水冷试样,而温度的进一步升高削弱了这种效应。当温度为 600℃时,加载角度与冷却方式之间的差异减弱。
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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