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Experimental and Numerical Analysis of Mode I Fracture Process of Rock by Semi-Circular Bend Specimen

Author

Listed:
  • Peng Xiao

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Diyuan Li

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Guoyan Zhao

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Meng Liu

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

The semi-circular bend (SCB) specimen is widely used to measure fracture toughness of brittle materials such as rock. In this work, the stress field, fracture process zone (FPZ), and crack propagation velocity of SCB specimen are analyzed during the fracture process of rock specimens. The FPZ of specimen is obtained by experimental and numerical methods under a three-point bend test. The stress concentration zones of specimen present a heart shape at peak load points. FPZ forms before macro fracture occurs. The macro fracture form inside FPZ in a post-peak region of a load–displacement curve. The crack propagation process of specimen include two stages, namely the rapid crack initial development stage, and the final crack splitting stage. The maximum crack propagation velocity of specimen is about 267 m/s, and the average crack propagation velocity is about 111 m/s.

Suggested Citation

  • Peng Xiao & Diyuan Li & Guoyan Zhao & Meng Liu, 2021. "Experimental and Numerical Analysis of Mode I Fracture Process of Rock by Semi-Circular Bend Specimen," Mathematics, MDPI, vol. 9(15), pages 1-14, July.
    • Handle: RePEc:gam:jmathe:v:9:y:2021:i:15:p:1769-:d:602061
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    Cited by:

    1. Xiaoyan Luo & Guoyan Zhao & Peng Xiao & Wengang Zhao, 2022. "Fracture Process and Failure Mode of Brazilian Discs with Cracks of Different Angles: A Numerical Study," Mathematics, MDPI, vol. 10(24), pages 1-18, December.
    2. Peng Xiao & Guoyan Zhao & Huanxin Liu, 2022. "Failure Transition and Validity of Brazilian Disc Test under Different Loading Configurations: A Numerical Study," Mathematics, MDPI, vol. 10(15), pages 1-19, July.

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