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Active sensing and damage detection using piezoelectric zinc oxide-based nanocomposites

机译：使用压电氧化锌基纳米复合材料的主动传感和损伤检测

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This study investigated the design and performance of piezoelectric nanocomposite-based interdigitated transducers (IDTs) for active sensing and damage detection. First, thin films that are highly piezoelectric and mechanically flexible were designed by embedding zinc oxide (ZnO) nanoparticles in a poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) piezo-polymer matrix. Second, the suspended nanoparticle solutions were then spin coated onto patterned comb electrodes to fabricate the IDTs. The films were then poled to align their electric domains and to increase their permanent piezoelectricity. Upon IDT fabrication, its sensing and actuation of Lamb waves on an aluminum pipe was validated. These results were also compared to data obtained from commercial Macro Fiber Composite IDT transducers. In the last phase of this work, damage detection was demonstrated by mounting these nanocomposite sensors and actuators (using a pitch-catch setup) onto an aluminum pipe and plate. Damage was simulated by tightening a band clamp around the pipe and by drilling holes in the plate. A damage index calculation was used to compare results corresponding to different levels of damage applied to the plate (i.e., different drilled hole depths), and good correlation was observed. Thus, ZnO/PVDF-TrFE transducers were shown to have the potential for use as piezoelectric transducers for structural health monitoring and damage detection.
机译：这项研究调查了基于压电纳米复合材料的叉指式换能器（IDT）的设计和性能，用于主动感应和损伤检测。首先，通过将氧化锌（ZnO）纳米粒子嵌入聚偏二氟乙烯-三氟乙烯（PVDF-TrFE）压电聚合物基质中，设计出具有高压电性和机械柔韧性的薄膜。其次，然后将悬浮的纳米颗粒溶液旋涂到图案化的梳状电极上以制造IDT。然后将薄膜极化以对齐其电畴并增加其永久压电性。在IDT制造之后，验证了其在铝管上感应和激活Lamb波的能力。这些结果也与从商用Macro Macro Composite IDT换能器获得的数据进行了比较。在这项工作的最后阶段，通过将这些纳米复合材料传感器和执行器（使用间距捕捉装置）安装到铝管和板上来演示损坏的检测。通过在管道周围拧紧带夹并在板上钻孔来模拟损坏。使用损伤指数计算来比较对应于施加到板的不同损伤水平（即，不同的钻孔深度）的结果，并且观察到良好的相关性。因此，显示ZnO / PVDF-TrFE换能器具有用作压电换能器以进行结构健康监测和损坏检测的潜力。

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