Electromagnetic pulsed thermography for natural cracks inspection

Yunlai Gao, Gui Yun Tian, Ping Wang, Haitao Wang, Bin Gao, Wai Lok Woo, Kongjing Li

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)
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Abstract

Emerging integrated sensing and monitoring of material degradation and cracks are increasingly required for characterizing the structural integrity and safety of infrastructure. However, most conventional nondestructive evaluation (NDE) methods are based on single modality sensing which is not adequate to evaluate structural integrity and natural cracks. This paper proposed electromagnetic pulsed thermography for fast and comprehensive defect characterization. It hybrids multiple physical phenomena i.e. magnetic flux leakage, induced eddy current and induction heating linking to physics as well as signal processing algorithms to provide abundant information of material properties and defects. New features are proposed using 1st derivation that reflects multiphysics spatial and temporal behaviors to enhance the detection of cracks with different orientations. Promising results that robust to lift-off changes and invariant features for artificial and natural cracks detection have been demonstrated that the proposed method significantly improves defect detectability. It opens up multiphysics sensing and integrated NDE with potential impact for natural understanding and better quantitative evaluation of natural cracks including stress corrosion crack (SCC) and rolling contact fatigue (RCF).
Original languageEnglish
Article number42073
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 7 Feb 2017

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