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Research on Fracture Toughness of Flattened Brazilian Disc Specimen after High Temperature

机译：高温后扁平巴西圆盘试样断裂韧性的研究

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摘要

Fracture toughness is an important parameter to study fracture characteristic of rock under external loads. Based on splitting tensile test on flattened Brazilian disc specimen of rock after high temperature, load-displacement curves of rock sample in the fracture process are obtained and three mechanical parameters of rock including fracture toughness, splitting tensile strength and elastic modulus are calculated according to the experiment. Then, the change rules of fracture toughness, splitting tensile strength and elastic modulus with temperature are discussed, and the relations between splitting tensile strength, elastic modulus and fracture toughness are established. Experimental results show that there exist two inflection points in load-displacement curves. The fracture toughness, splitting tensile strength and elastic modulus reduce gradually with increasing temperature, among which, the mechanical parameters of granite decrease approximately linearly while that of marble decrease approximately as exponential function. There is a close connection between splitting tensile strength, elastic modulus and fracture toughness, nearly a good linear relationship. Since the test method of splitting tensile strength is relatively simple and that of fracture toughness is complex, the fracture toughness can be roughly estimated by splitting tensile strength.
机译：断裂韧性是研究岩石在外部载荷下的断裂特性的重要参数。通过对巴西平板岩石圆盘试样进行高温拉伸后的劈裂拉伸试验，得到了岩石样品在断裂过程中的载荷-位移曲线，并根据断裂强度计算了岩石的三个力学参数，包括断裂韧性，劈裂抗拉强度和弹性模量。实验。然后，讨论了断裂韧性，断裂拉伸强度和弹性模量随温度的变化规律，建立了断裂拉伸强度，弹性模量和断裂韧性之间的关系。实验结果表明，载荷-位移曲线中存在两个拐点。断裂韧性，劈裂抗拉强度和弹性模量随着温度的升高而逐渐降低，其中，花岗岩的力学参数近似呈线性下降，而大理石的力学参数则呈指数下降。劈裂抗拉强度，弹性模量和断裂韧性之间有着紧密的联系，几乎具有良好的线性关系。由于断裂拉伸强度的测试方法相对简单并且断裂韧性的测试方法复杂，因此可以通过断裂拉伸强度来粗略估计断裂韧性。

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  • 来源
    《High temperature materials and processes》 |2016年第1期|81-87|共7页
  • 作者

    Shi Liu; Jinyu Xu; Peng Wang; Xinyu Fang;

  • 作者单位

    Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China;

    Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China;

    Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China;

    Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    granite; marble; high temperature; flattened Brazilian disc; fracture toughness;

    机译：花岗岩;大理石;高温;压扁的巴西圆盘;断裂韧性;

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