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Extending application of asymmetric semi-circular bend specimen to investigate mixed mode I/II fracture behavior of granite

基于非对称半圆弯曲试件(ASCB)测定花岗岩的I/II断裂力学行为

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Abstract

The asymmetric semi-circular bend (ASCB) specimen has been proposed to investigate the cracking behavior in different geo and construction materials and attracted the attention of researchers due to its advantages. However, there are few studies on the fracture toughness determination of rock materials. In this work, a series of fracture tests were performed with the ASCB specimens made of granite. The onset of fracture, crack initiation angle and crack propagating trajectory was analyzed in detail combined with several mixed mode fracture criteria. The influence of the crack length on the mode I/II fracture toughness was studied. A comparison between the fracture toughness ratios predicted by varying criteria and experimental results was conducted. The relationship between experimentally determined crack initiation angles and curves of the generalized maximum tangential stress (GMTS) criterion was obtained. The fracture process of the specimen was recorded with the high-speed camera. The shortcomings of the ASCB specimens for the fracture toughness determination of rock materials were discussed. The results may provide a reference for analysis of mixed mode I and II fracture behavior of brittle materials.

摘要

非对称半圆弯曲试件(ASCB)以结构简单、加工经济、实验实施便利等优点广泛应用于建筑材料 的断裂力学行为研究, 然而, 目前很少使用ASCB试件测定岩石的断裂特征. 本文采用不同裂纹长度 的花岗岩ASCB试样, 研究花岗岩的断裂韧度值、裂纹开裂角以及裂纹扩展轨迹等断裂力学行为. 首 先, 分析裂纹长度对纯I/II 型断裂韧度的影响. 然后, 结合多种混合断裂理论, 分析对比断裂韧度比 值理论值与试验值的差异, 以及断裂理论预测开裂角及实验测量值的差异, 得到了预测混合断裂韧度 及裂纹断裂角的最优准则. 最后, 探讨了半圆弯曲、非对称半圆弯曲试件测量岩石材料断裂力学特性 时存在的不足之处. 研究发现, 当断裂过程区尺寸为2.6 mm时, 采用广义最大环向拉应力准则能够很 好地预测裂纹断裂角. 在使用非对称半圆弯曲试件执行岩石断裂实验时, 应把预制裂纹切割更深, 即 调整裂纹长度与试件半径的比值达到更大. 本文的研究结果将为工程岩体断裂失稳机制的研究提供 参考.

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Authors and Affiliations

  1. Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, China

    Qiu-hong Wu  (吴秋红), Cheng-long Xie  (谢成龙) & Yan-lin Zhao  (赵延林)

  2. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    You-sheng Xie  (谢柚生)

  3. College of Resources and Metallurgy, Guangxi University, Nanning, 530004, China

    Xue-feng Li  (李学锋)

  4. Department of Building Engineering, Hunan Institute of Engineering, Xiangtan, 411101, China

    Jie Liu  (刘杰)

  5. School of Civil Engineering, Wuhan University, Wuhan, 430072, China

    Lei Weng  (翁磊)

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  1. Qiu-hong Wu  (吴秋红)
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Projects(52004182, 51804110, 51904101) supported by the National Natural Science Foundation of China; Project (2020JJ5188) supported by the Natural Science Foundation of Hunan Province, China

Contributors

WU Qiu-hong provided the concept and edited the draft of manuscript. XIE You-sheng conducted the literature review and wrote the first draft of the manuscript. LIU Jie and WENG Lei analyzed the measured data. ZHAO Yan-lin and LI Xue-feng edited the draft of manuscript. XIE Cheng-long conducted numerical simulations. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

WU Qiu-hong, XIE Cheng-long, XIE You-sheng, ZHAO Yan-lin, LI Xue-feng, LIU Jie and WENG Lei declare that they have no conflict of interest.

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Wu, Qh., Xie, Cl., Xie, Ys. et al. Extending application of asymmetric semi-circular bend specimen to investigate mixed mode I/II fracture behavior of granite. J. Cent. South Univ. 29, 1289–1304 (2022). https://doi.org/10.1007/s11771-022-4989-6

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