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首页> 外文期刊>Structural health monitoring >Real-time strain monitoring and damage detection of composites in different directions of the applied load using a microscale flexible Nylon/Ag strain sensor
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Real-time strain monitoring and damage detection of composites in different directions of the applied load using a microscale flexible Nylon/Ag strain sensor

机译：使用微观柔性尼龙/ AG应变传感器的施加负荷不同方向上复合材料的实时应变监测和损伤检测

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摘要

Composites are prone to failure during operating conditions and that is why vast research studies have been carried out to develop in situ sensors and monitoring systems to avoid their catastrophic failure and repairing cost. The aim of this research article was to develop a flexible strain sensor wire for real-time monitoring and damage detection in the composites when subjected to operational loads. This flexible strain sensor wire was developed by depositing conductive silver (Ag) nanoparticles on the surface of nylon (Ny) yarn by electroless plating process to achieve smallest uniform coating film without jeopardizing the integrity of each material. The sensitivity of this Nylon/Ag strain sensor wire was calculated experimentally, and gauge factor was found to be in the range of 21-25. Then, the Nylon/Ag strain sensor wire was inserted into each composite specimen at different positions intentionally during fabrication depending upon the type of damage to detect. The specimens were subjected to tensile loading at a strain rate of 2 mm/min. Overall mechanical response of composite specimens and electrical response signal of the Nylon/Ag strain sensor wire showed good reproducibility in results; however, the Nylon/Ag sensor showed a specific change in resistance in each direction because of the respective position. The strain sensor wire designed not only monitored the change in the mechanical behavior of the specimen during the elongation and detected the strain deformation but also identified the type of damage, whether it was compressive or tensile. This sensor wire showed good potential as a flexible reinforcement in composite materials for in situ structural health monitoring applications and detection of damage initiation before it can become fatal.
机译：在操作条件下，复合材料易于发生故障，这就是为什么正在进行巨大的研究研究，以便在原位传感器和监测系统中开发，以避免其灾难性的故障和修复成本。本研究制品的目的是在经过运营负载时开发一种柔性应变传感器线，用于在复合材料中的实时监测和损坏检测。该柔性应变传感器线是通过通过化学镀工艺在尼龙（NY）纱线表面上的导电银（Ag）纳米颗粒而开发的，以实现最小的均匀涂膜，而不会危及每种材料的完整性。实验计算该尼龙/ AG应变传感器线的灵敏度，并且发现量因子在21-25的范围内。然后，根据要检测的损坏的类型，在制造期间，在制造过程中有意地将尼龙/ Ag应变传感器线插入每个复合样品中。以2mm / min的应变速率对样品进行拉伸载荷。尼龙/ AG应变传感器线的复合试样的整体机械响应和尼龙/ AG应变传感器线的电响应信号显示出良好的成果再现性;然而，由于位置，尼龙/ Ag传感器在每个方向上显示出的特定变化。应变传感器线设计不仅在伸长率期间监测样品的机械行为的变化，并检测到应变变形，而且还确定了损坏的类型，无论是压缩还是拉伸。该传感器线显示出良好的潜力，作为用于原位结构健康监测应用的复合材料中的柔性加强件，并在它变得致命之前检测损伤启动。

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