STP722: Finite-Element Analysis of Eddy-Current Flaw Detection

    Chari, MVK
    Manager, Electromagnetics Program, and manager, Nondestructive Testing and Measurement Program, General Electric Company, Schenectady, N.Y.

    Kincaid, TG
    Manager, Electromagnetics Program, and manager, Nondestructive Testing and Measurement Program, General Electric Company, Schenectady, N.Y.

    Pages: 17    Published: Jan 1981


    Abstract

    The eddy-current nondestructive evaluation (NDE) inversion problem is to determine flaw parameters from eddy-current sensor impedance changes. Two approaches to solving this problem are discussed for geometries with two components of eddy current. The first is to use the finite-element method of numerical analysis to compute the sensor impedance change for each flaw parameter value. The second approach is to combine the finite-element method with an analytical scattering technique. These two approaches are applied to the problem of an infinitely long coil surrounding an infinitely long conducting bar with an infinitely long surface crack. The calculated impedance changes show good agreement with known analytical and experimental results.

    Keywords:

    eddy current testing, nondestructive testing, nondestructive evaluation, finite-element method


    Paper ID: STP27578S

    Committee/Subcommittee: E07.10

    DOI: 10.1520/STP27578S


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