Eddy-Current Characterization of Materials and Structures 1981
DOI: 10.1520/stp27575s
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Development of Theoretical Models for Nondestructive Testing Eddy-Current Phenomena

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 … Show more

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Cited by 27 publications
(12 citation statements)
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“…That is, ~Z3D = (.17 x 10-5 )/1 2 ohms, where I is the drive current required to produce a current density of 10 6 amps/m 2 in the coil whereas the 2D finite element code predicted ~Z2D = (0.425 x 1O-4 }/I2 ohms/m. Assuming that W=0.16" (= 0.004 meter), these results imply 0.17 x 10-5 /1 2 0.1 (4) (0.425xlO-4 /I2}xO.004…”
Section: -D Field Scattering Theorymentioning
confidence: 90%
“…That is, ~Z3D = (.17 x 10-5 )/1 2 ohms, where I is the drive current required to produce a current density of 10 6 amps/m 2 in the coil whereas the 2D finite element code predicted ~Z2D = (0.425 x 1O-4 }/I2 ohms/m. Assuming that W=0.16" (= 0.004 meter), these results imply 0.17 x 10-5 /1 2 0.1 (4) (0.425xlO-4 /I2}xO.004…”
Section: -D Field Scattering Theorymentioning
confidence: 90%
“…Modeling of steady state eddy currents has been extensively treated and reported as part of a practical defect characterization scheme [9][10][11] while moving eddy current coils have also been successfully modeled [12][13][14]. A number of three dimensional models have also been reported in the literature using finite ele ments and boundary elements independently [15][16][17][18][19][20].…”
Section: Scope Of the Thesismentioning
confidence: 99%
“…The FEM was popularized in the area of electromagnetic NDT by Lord et al [3]- [6]. Two-dimensional (2-D) models and axisymmetric models simulating axisymmetric coils and induced currents are particularly simple and are based on single-component (vertical component or circumferential-component) magnetic vector potential (MVP) formulation.…”
Section: Introductionmentioning
confidence: 99%