真实世界SHM中载纳米碳飞机涂料传感器的制造、表征和修复:实验室规模的研究

IF 5.7 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Carlos Cuellar, Kaitlyn Watson, Elisabeth Smela
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引用次数: 0

摘要

压阻式纳米碳负载聚合物薄膜用于结构健康监测,包括损伤检测和应变监测,已经引起了相当大的兴趣。虽然表现良好,但与实际执行有关的问题受到的关注较少。在这里,我们展示了由剥离石墨纳米片(xGnP)制成的传感器,该传感器与一种应用于西科斯基飞机的商用涂料结合在一起。开发了一种配方和制造方法,可提供高压阻应变灵敏度和机械完整性。在大约7 wt% xGnP的情况下,张力的测量系数在30-55之间,通过检测射孔可以证明传感器对损伤监测的有效性。为了获得可喷涂的溶液,选择引入纳米碳的溶剂的关键考虑因素是相容性和保持纳米碳悬浮的能力,这是通过使用乙酸乙酯来实现的。在飞机结构上形成原位传感器的能力需要一种简单的方法来制造强大的电气连接,这里使用嵌入式铜网进行演示。聚合物-纳米碳材料的强的、通常是非线性的环境敏感性也必须在应用中考虑;在这里,温度和湿度的增加都会增加传感器的电阻。这项工作表明,第二种无张力参考传感器可以很好地用于自动补偿。最后,展示了一种采用标准工艺并保持高测量因子的修复方法。有了这些进步,paint-xGnP传感器已经准备好在飞机上进行现场测试。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fabrication, characterization, and repair of nanocarbon-loaded aircraft paint-based sensors for real-world SHM: studies at the laboratory scale
There has been considerable interest in piezoresistive nanocarbon-loaded polymer films for structural health monitoring, including damage detection and strain monitoring. While good performance has been demonstrated, issues related to practical implementation have received less attention. Here we present sensors made from exfoliated graphite nanoplatelets (xGnP) incorporated into a commercial paint that is applied to Sikorsky aircraft. A formulation and a fabrication method are developed that deliver high piezoresistive strain sensitivity alongside mechanical integrity. At approximately 7 wt% xGnP, the gauge factor in tension is in the range of 30–55, and the effectiveness of the sensors for damage monitoring is demonstrated by the detection of perforations. To obtain a paintable solution, key considerations in choosing the solvent employed for introducing the nanocarbon are compatibility and the ability to keep the nanocarbon suspended, which is achieved using ethyl acetate. The ability to form sensors in situ on aircraft structures requires an uncomplicated method of making robust electrical connections, which is demonstrated here using embedded copper mesh. The strong, often nonlinear, environmental sensitivity of polymer-nanocarbon materials must also be considered in applications; here, increasing temperature and humidity both raise sensor resistance. This work shows that a second, unstrained reference sensor would work well for automatic compensation. Lastly, a method for effecting a repair that employs standard processes and maintains the high gauge factor is demonstrated. With these advances, the paint-xGnP sensors are ready for in-the-field testing on aircraft.
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来源期刊
CiteScore
12.80
自引率
12.10%
发文量
181
审稿时长
4.8 months
期刊介绍: Structural Health Monitoring is an international peer reviewed journal that publishes the highest quality original research that contain theoretical, analytical, and experimental investigations that advance the body of knowledge and its application in the discipline of structural health monitoring.
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