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In Situ Damage Detection for Fiber-Reinforced Composites Using Integrated Zinc Oxide Nanowires

机译：使用集成氧化锌纳米线的纤维增强复合材料的原位损伤检测

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摘要

A multifunction material that increases strength is capable of harvesting energy from ambient vibration and acts as a structural health monitoring system is presented. Current in situ damage detection of fiber-reinforced composites typically uses methods which require external sensors, precise initial measurements for each component under evaluation, or input current to the structure. To overcome these limitations, this work utilizes a multifunctional interphase of piezoelectric zinc oxide nanowires integrated into fiber-reinforced composites to provide an in situ ability to sense damage. The nanowires are grown onto insulating reinforcing fibers which are sandwiched between carbon fiber electrodes, thus fully integrating the sensing element into the fiber-reinforced composite. The fully distributed nanowire interphase proves capable of detecting multiple damage modes using passive voltage measurements as demonstrated during multiple loading configurations. This work also analyzes voltage emissions corresponding to damage to provide signal characteristics corresponding to the damage state of the specimen to indicate damage progression and the approach of catastrophic failure. The result of this work is thus a multifunctional structural material with damage detection capabilities. The principles investigated in this work can also be extended to alternative structural composites containing integrated piezoelectric materials in the form of nanoparticles, nanowires, or films.
机译：提出了一种增加强度的多功能材料，该材料能够从周围的振动中收集能量并充当结构健康监测系统。当前纤维增强复合材料的原位损伤检测通常使用以下方法，这些方法需要外部传感器，对评估中的每个组件进行精确的初始测量或向结构输入电流。为了克服这些局限性，这项工作利用了集成在纤维增强复合材料中的压电氧化锌纳米线的多功能界面，以提供原位感知损伤的能力。纳米线生长在绝缘增强纤维上，该绝缘增强纤维夹在碳纤维电极之间，从而将传感元件完全集成到纤维增强复合材料中。事实证明，完全分散的纳米线界面可以使用无源电压测量来检测多种损坏模式，如在多种负载配置中所展示的。这项工作还分析了与损伤相对应的电压发射，以提供与样品的损伤状态相对应的信号特征，以指示损伤的进展和灾难性破坏的途径。因此，这项工作的结果是一种具有损伤检测功能的多功能结构材料。在这项工作中研究的原理还可以扩展到包含纳米颗粒，纳米线或薄膜形式的集成压电材料的替代结构复合材料。

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