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Fabrication and analysis of integrated multifunctional MWCNTS sensors in glass fiber reinforced polymer composites

机译：玻璃纤维增​​强聚合物复合材料中集成多功能MWCNTS传感器的制造与分析

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Glass Fiber Reinforced Polymer (GFRP) composites have been widely used in advanced engineering applications, mainly in the automotive and aerospace industries. Due to its anisotropic nature, the damage and failure detection in composites under real-time loading are very complicated. Focusing on this problem, Multi-Walled Carbon Nanotubes (MWCNTs) based strain sensor for Structural Health Monitoring (SHM) of Fibre Reinforced Polymer (FRP) composites is proposed in this research. This study primarily aims to detect induced flexural strains and damages occurring in the composites in real-time for which glass fibers coated with carboxy and amide functionalized MWCNTs have been used as sensors. The interactions between MWCNTs and fiber surface were confirmed with FTIR. Carbon fiber sensors have been used for comparison. The sensors were embedded into GFRP composites which were subjected to three-point bending tests coupled with electrical resistance measurement to correlate the induced strain and damages with the fractional change in resistance across sensors. The electromechanical test results indicated that MWCNT coated sensors in GFRP composites show promising piezoresistive sensing characteristics with good cyclic reproducibility that is significant for in-situ strain monitoring and damage detection. Overall the highest strain sensitivity was observed with amide functionalized MWCNT sensors. The electrical response to temperature cycles showed a reproducible behavior with -8% relative resistance change within the temperature range of -10 degrees C to 80 degrees C which also signifies multifunctional characteristics of developed sensors.
机译：玻璃纤维增​​强聚合物（GFRP）复合材料已广泛用于先进的工程应用，主要是在汽车和航空航天行业。由于其各向异性性质，实际负载下复合材料的损伤和失效检测非常复杂。专注于该问题，在本研究中提出了用于纤维增强聚合物（FRP）复合材料的结构健康监测（SHM）的多壁碳纳米管（MWCNT）的应变传感器。该研究主要旨在检测诱导的弯曲菌株和在复合材料中发生的损伤，实时用于涂有羧基和酰胺官能化MWCNT的玻璃纤维已被用作传感器。用FTIR确认MWCNT和纤维表面之间的相互作用。碳纤维传感器已被用于比较。将传感器嵌入到GFRP复合材料中，该GFRP复合材料与电阻测量相结合的三点弯曲试验，以将诱导的应变和损坏与传感器的抗性的分数变化相关联。机电测试结果表明，GFRP复合材料中的MWCNT涂层传感器显示出具有良好的压阻性传感特性，具有良好的循环再现性，这对于原位应变监测和损坏检测具有重要意义。总体而言，用酰胺官能化MWCNT传感器观察到最高应变敏感性。对温度循环的电气响应表明，在-10摄氏度至80摄氏度的温度范围内具有-8％相对电阻变化的可再现行为，这也意识到了开发传感器的多功能特性。

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