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Sensing of Damage Mechanisms in Fiber-Reinforced Composites under Cyclic Loading using Carbon Nanotubes

机译：碳纳米管在循环载荷下纤维增强复合材料的损伤机理

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摘要

The expanded use of advanced fiber-reinforced composites in structural applications has brought attention to the need to monitor the health of these structures. It has been established that adding carbon nanotubes to fiber-reinforced composites is a promising way to detect the formation of microscale damage. Because carbon nanotubes are three orders of magnitude smaller than traditional advanced fibers, it is possible for nanotubes to form an electrically conductive network in the polymer matrix surrounding the fibers. In this work, multi-walled carbon nanotubes are dispersed into epoxy and infused into a glass-fiber preform to form a network of in situ sensors. The resistance of the cross-ply composite is measured in real-time during incremental cyclic tensile loading tests to evaluate the damage evolution and failure mechanisms in the composite. Edge replication is conducted to evaluate the crack density after each cycle, and optical microscopy is utilized to study the crack mode and growth. The evolution of damage can be clearly identified through the damaged resistance parameter. Through analyzing the damaged resistance response curves with measurements of transverse crack density and strain, the transition between different failure modes can be identified. It is demonstrated that the integration of an electrically conducting network of carbon nanotubes in a glass fiber composite adds unique damage-sensing functionality that can be utilized to track the nature and extent of microstructural damage in fiber composites.
机译：高级纤维增强复合材料在结构应用中的广泛使用已引起人们对监视这些结构健康状况的关注。已经确定，将碳纳米管添加到纤维增强复合材料中是检测微尺度损伤形成的有前途的方法。因为碳纳米管比传统的先进纤维小三个数量级，所以纳米管有可能在围绕纤维的聚合物基质中形成导电网络。在这项工作中，将多壁碳纳米管分散在环氧树脂中，并注入玻璃纤维预制棒中，以形成原位传感器网络。在增量循环拉伸载荷测试期间，实时测量交叉复合材料的电阻，以评估复合材料中的损伤演变和破坏机理。在每个循环后进行边缘复制以评估裂纹密度，并利用光学显微镜研究裂纹模式和扩展。通过损坏的电阻参数可以清楚地识别损坏的演变。通过测量横向裂纹密度和应变分析受损的电阻响应曲线，可以确定不同破坏模式之间的过渡。已证明，玻璃纤维复合材料中碳纳米管导电网络的集成增加了独特的损伤感应功能，可用于跟踪纤维复合材料中微结构损伤的性质和程度。

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  • 来源
    《Advanced Functional Materials》 |2009年第1期|123-130|共8页
  • 作者

    Limim Gao; Erik T. Thostenson; Zuoguang Zhang; Tsu-Wei Chou;

  • 作者单位

    School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 (China);

    Department of Mechanical Engineering and Center for Composite Materials University of Delaware, Newark DE 19716 (USA);

    School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 (China);

    Department of Mechanical Engineering and Center for Composite Materials University of Delaware, Newark DE 19716 (USA);

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