Effect of uneven thickness of adhesive layer on EMI method

Rui Hao , Yuanfan Wang , Yu Bao , Guoquan Shi

Abstract

The electromechanical impedance (EMI) method is utilized for monitoring corrosion damage in pipelines. However, the variable thickness of the adhesive layer at the planar and cylindrical interfaces presents a challenge. To investigate the impact of uneven adhesive layer thickness on the EMI method, a theoretical model has been developed. This model analyzes the distribution of shear stress in the adhesive layer and the root-mean-square deviation (RMSD) of the impedance of the PZT. It was observed that the energy conversion efficiency decreased with a thicker adhesive layer. In monitoring cylindrical surface structures using the EMI method, the thicker adhesive layer locations experienced concentrated shear stresses, exacerbating energy attenuation and reducing monitoring sensitivity. In an experimental corrosion monitoring study of an aluminum alloy pipeline, two groups of PZTs with different forms of pasting were compared. The analysis of the RMSD of the PZT impedance before and after corrosion revealed that the group with poorer homogeneity exhibited lower sensitivity. Additionally, the theory provides a permissible error range for the pasting process.

Key Words

corrosion monitoring; EMI method; uneven thickness of adhesive layer

Address

(1) Rui Hao, Yuanfan Wang, Yu Bao — Institute of Electronic and Electrical Engineering, Civil Aviation Flight University of China, 46 Nanchang Road, Guanghan, Sichuan 618307, China
(2) Rui Hao — Sichuan Province Engineering Technology Research Center of General Aircraft Maintenance, Civil Aviation Flight, University of China, Guanghan, Sichuan 618307, China
(3) Guoquan Shi — Guangdong Excellence Shengda Anti-Corrosion Engineering Technology Co., Ltd., 1 Chongmin Road, Foshang, Guangdong 528211, China.

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