STP722

    Development of Theoretical Models for Nondestructive Testing Eddy-Current Phenomena

    Published: Jan 1981


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    Abstract

    Eddy-current methods of nondestructive testing rely for their operation on the interaction of induced alternating currents and fields with defects to produce noticeable changes in search coil impedance. To date, analytical techniques have been largely ineffective in providing a model suitable for the basis of a general defect characterization scheme because of the inherent complexity of the field equations describing the phenomena. After an overview of the available analytical models, this paper describes the development of a numerical model that shows promise of providing a solution to the inverse eddy-current problem. Impedance plane trajectories are predicted for a differential probe passing through a tube with axisymmetric inside-diameter and outside-diameter slots to illustrate the use of the numerical approach.

    Keywords:

    nondestructive testing, eddy currents, theoretical modeling, finite element analysis, defect characterization


    Author Information:

    Lord, W
    Professor and graduate research assistant, Colorado State University, Fort Collins, Colo.

    Palanisamy, R
    Professor and graduate research assistant, Colorado State University, Fort Collins, Colo.


    Paper ID: STP27575S

    Committee/Subcommittee: E07.10

    DOI: 10.1520/STP27575S


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