An Eddy Current-Based Structural Health Monitoring Technique for Tracking Bolt Cracking
School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
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Sensors 2020, 20(23), 6843; https://doi.org/10.3390/s20236843
Received: 28 October 2020
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Revised: 26 November 2020
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Accepted: 27 November 2020
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Published: 30 November 2020
(This article belongs to the Section Electronic Sensors)
Bolted joints are the primary structures for the load transfer of large-scale structures. It is vital to monitor the process of bolt cracking for enduring structural safety. In this paper, a structural health monitoring technique based on the embedding eddy current sensing film has been proposed to quantify the crack parameters of bolt cracking. Two configurations of the sensing film containing one-dimensional circumferential coil array and two-dimensional coil array are designed and verified to have the ability to identify three crack parameters: the crack angle, the crack depth, and the crack location in the axial direction of the bolt. The finite element method has been employed not only to verify the capacity of the sensing film, but also to investigate the interaction between the crack and the eddy current/magnetic field. It has been demonstrated that as the crack propagates, the variations of the induced voltage of the sensing coils are influenced by both eddy current effect and magnetic flux leakage, which play different roles in the different periods of the crack propagation. Experiments have been performed to verify the effectiveness and feasibility of the sensing film to quantify three crack parameters in the process of the bolt cracking.
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MDPI and ACS Style
Sun, H.; Wang, T.; Lin, D.; Wang, Y.; Qing, X. An Eddy Current-Based Structural Health Monitoring Technique for Tracking Bolt Cracking. Sensors 2020, 20, 6843. https://doi.org/10.3390/s20236843
AMA Style
Sun H, Wang T, Lin D, Wang Y, Qing X. An Eddy Current-Based Structural Health Monitoring Technique for Tracking Bolt Cracking. Sensors. 2020; 20(23):6843. https://doi.org/10.3390/s20236843
Chicago/Turabian StyleSun, Hu, Tao Wang, Dawei Lin, Yishou Wang, and Xinlin Qing. 2020. "An Eddy Current-Based Structural Health Monitoring Technique for Tracking Bolt Cracking" Sensors 20, no. 23: 6843. https://doi.org/10.3390/s20236843
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