Finite-Element Analysis of an Electromechanical Impedance–Based Corrosion Sensor with Experimental Verification
Publication: Journal of Aerospace Engineering
Volume 32, Issue 3
Abstract
Corrosion-induced metal loss in critical structures is a widespread and urgent problem across multiple industries. In this paper, a novel corrosion sensor was proposed based on the theory of electromechanical impedance (EMI). The sensor was fabricated by bonding a lead-zirconate-titanate (PZT) patch onto the metal plate of the same cross-sectional area. The principle of the corrosion sensor is that corrosion-induced thickness loss of the metal plate leads to the change in the EMI of the sensor. Therefore, the corrosion amount can be determined from the impedance response of the PZT. EMI simulation of the sensor, together with modal analysis, was performed through finite-element analysis (FEA). Experimental verification studies were also conducted to validate the simulation results. Results showed that the peak frequency of the first transverse bending mode decreases with the loss of thickness, which can be used to determine the corrosion amount quantitatively. The proposed corrosion sensor has the advantages of low cost, quantitative determination of corrosion amount, and on-line and remote monitoring capability, which shows promising application potential.
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Acknowledgments
The research reported in this paper was partially supported by the National Natural Science Foundation of China (Nos. 51808170, 51678200, and 51678205), China Postdoctoral Science Foundation (No. 2018M630362) and Program of Shenzhen Science and Technology Plan (Nos. JCYJ20170811160514862 and JCYJ20170307150200952).
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 3 • May 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 5, 2018
Accepted: Oct 22, 2018
Published online: Feb 18, 2019
Published in print: May 1, 2019
Discussion open until: Jul 18, 2019
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