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High temperature digital image correlation evaluation of in-situ failure mechanism: An experimental framework with application to C/SiC composites

机译：原位破坏机理的高温数字图像相关性评估：在C / SiC复合材料中应用的实验框架

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摘要

A high temperature digital image correlation (DIC) technique was developed, which was applied to study the in-situ fracture behavior of a carbon fibre reinforced silicon carbide matrix (C/SiC) composite. The displacement distribution and cracking information of the C/SiC single edge notched beam specimen can be monitored real-time, thanks to the improved DIC technique with special speckle patterns that can reach up to 1600 ℃. The results showed that the brittle to ductile transition temperature of C/SiC composites is about 1300 ℃ The new failure mechanisms of C/SiC composites at different experimental temperatures were further verified with the aid of X-ray diffraction and scanning electron microscope (SEM) techniques. In addition, the relationships between the fracture toughness, first-crack strength of C/ SiC composites and environmental temperature were deduced. The proposed experimental method and testing results may shed some light on assessing the reliability and durability of C/SiC composites at high temperatures.
机译：开发了一种高温数字图像相关技术，该技术被用于研究碳纤维增强碳化硅基体（C / SiC）复合材料的原位断裂行为。借助改进的DIC技术（具有高达1600℃的特殊散斑图样），可以实时监控C / SiC单边切口梁试样的位移分布和裂纹信息。结果表明，C / SiC复合材料的脆性至韧性转变温度约为1300℃。借助X射线衍射和扫描电子显微镜（SEM）进一步验证了C / SiC复合材料在不同实验温度下的新破坏机理。技术。此外，推导了C / SiC复合材料的断裂韧性，初断裂强度与环境温度之间的关系。所提出的实验方法和测试结果可能有助于评估C / SiC复合材料在高温下的可靠性和耐久性。

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  • 来源
    《Materials Science and Engineering》 |2016年第17期|26-34|共9页
  • 作者

    W.G. Mao; J. Chen; M.S. Si; R.F. Zhang; Q.S. Ma; D.N. Fang; X. Chen;

  • 作者单位

    School of Materials Science and Engineering, Xiangtan University, Hunan 411105, PR China,Department of Earth and Environmental Engineering, Columbia University, NY 10027, United States;

    School of Materials Science and Engineering, Xiangtan University, Hunan 411105, PR China;

    School of Materials Science and Engineering, Xiangtan University, Hunan 411105, PR China;

    School of Materials Science and Engineering, Xiangtan University, Hunan 411105, PR China;

    Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, PR China;

    State Key Lab for Turbulence and Complex Systems, Peking University, Beijing 100871, PR China;

    Department of Earth and Environmental Engineering, Columbia University, NY 10027, United States;

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  • 正文语种 eng
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  • 关键词

    C/SiC composites; Mechanical properties; Digital image correlation; High-temperature testing; Brittle to ductile transition;

    机译：C / SiC复合材料;机械性能数字图像相关;高温测试;脆性到韧性转变;

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