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Open AccessArticle

Monitoring of Fiber-Reinforced Composite Single-Lap Joint with Electromechanical Impedance of Piezoelectric Transducer

School of Aerospace Engineering, Xiamen University, Xiamen 361002, China
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Materials 2019, 12(19), 3241; https://doi.org/10.3390/ma12193241
Received: 10 September 2019 / Revised: 29 September 2019 / Accepted: 1 October 2019 / Published: 4 October 2019
The single-lap joint of fiber-reinforced composites is a common structure in the field of structure repair, which has excellent mechanical properties. To study and monitor its quasi-static response behavior under external load, two methodologies called effective structural mechanical impedance (ESMI) and reduced-ESMI (R-ESMI) are presented in this article. A two-dimensional electromechanical impedance (EMI) model for a surface-bonded square piezoelectric transducer (PZT) is adopted to extract more sensitive signatures from the measured raw signatures. There are two major advantages of the monitoring scheme based on ESMI and R-ESMI signatures: (1) excellent monitoring results with less signatures to process, (2) the ability to monitor the quasi-static behavior of a single-lap joint with previously ignored susceptance signatures. Combining the extracted ESMI signatures with the index of root-mean-square deviation, the quasi-static behavior of single-lap joints can be effectively quantified. To test the effectiveness of ESMI methodology, verifying experiments were conducted. The experimental results convincingly demonstrated that the presented ESMI and R-ESMI methodologies have good feasibility in monitoring the quasi-static behavior of a fiber-reinforced composite single-lap joint. The proposed method has potential application in the field of structural health monitoring (SHM). View Full-Text
Keywords: fiber-reinforced composites; single-lap joint; quasi-static behavior; electromechanical impedance; piezoelectric transducer; structural health monitoring fiber-reinforced composites; single-lap joint; quasi-static behavior; electromechanical impedance; piezoelectric transducer; structural health monitoring
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Zhu, J.; Qing, X.; Liu, Q.; Liu, X.; Wang, Y. Monitoring of Fiber-Reinforced Composite Single-Lap Joint with Electromechanical Impedance of Piezoelectric Transducer. Materials 2019, 12, 3241.

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