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Lookup NU author(s): Dr Jianbo Wu, Junzhen Zhu, Professor Gui Yun TianORCiD
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
© 2020 Elsevier LtdA common challenge in maintenance of critical structures is how to fast localize and quantify geometries of surface-breaking cracks. Induction thermography (IT) is a potential technique to detect this type of defects. However, for testing ferromagnetic structures, if a deep defect exists in the wall structure, only its shallower part within the skin-depth layer affects the early thermal response of IT, whereas its deeper part hardly has any influence on the early response. To extend the detectable depth range of traditional IT for ferromagnetic materials, a DC-biased magnetization based induction thermography (DCMIT) technique is introduced in this paper. Based on the permeability distortion in the skin-depth layer, DCMIT can build a monotonic relation between the thermal feature and the defect depth. Results show that when the coil direction is parallel to the notch's length direction, DCMIT can quantify the notch with a depth up to 6.0 mm whereas traditional IT can hardly achieve this depth detection.
Author(s): Wu J, Zhu J, Tian GY
Publication type: Article
Publication status: Published
Journal: Mechanical Systems and Signal Processing
Year: 2020
Volume: 141
Print publication date: 01/07/2020
Online publication date: 20/02/2020
Acceptance date: 05/02/2020
Date deposited: 15/04/2020
ISSN (print): 0888-3270
ISSN (electronic): 1096-1216
Publisher: Academic Press
URL: https://doi.org/10.1016/j.ymssp.2020.106719
DOI: 10.1016/j.ymssp.2020.106719
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