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    Volume 45, Issue 5 (September 2017)

    LOI-Based Pulsed Eddy Current Evaluation of Hidden Material Degradation in Coated Nonmagnetic Conductors

    (Received 15 April 2016; accepted 5 July 2016)

    Published Online: 2016

    CODEN: JTEVAB

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    Abstract

    Coated nonmagnetic conductors are subject to material degradation hidden under nonmetallic coating. It is formidable to evaluate the degradation degree and thickness of degradation region without removing the non-conductive coating. In light of this, in this paper the feasibility of pulsed eddy current (PEC) probes for nondestructive assessment of hidden material degradation in coated nonmagnetic conductors was investigated. The characteristics of lift-off intersection (LOI) of signals from PEC probes were utilized in a bid to cancel out the influence of coating thickness on signals. A fast inverse scheme based on LOI was proposed, along with the probe to implement simultaneous evaluation of the degradation degree and thickness. A series of experiments revealed that the proposed probe is high-efficiency and capable of assessing hidden material degradation without much loss of accuracy.

    Author Information:

    Li, Y.
    State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, School of Aerospace, Xi'an Jiaotong Univ., Xi'an,

    Jing, H.
    State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, School of Aerospace, Xi'an Jiaotong Univ., Xi'an,

    Yan, B.
    State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, School of Aerospace, Xi'an Jiaotong Univ., Xi'an,

    Zhang, X.
    State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, School of Aerospace, Xi'an Jiaotong Univ., Xi'an,


    Stock #: JTE20160210

    ISSN:0090-3973

    DOI: 10.1520/JTE20160210

    Author
    Title LOI-Based Pulsed Eddy Current Evaluation of Hidden Material Degradation in Coated Nonmagnetic Conductors
    Symposium ,
    Committee E07