Developments in efficiently modelling eddy current testing of narrow cracks

Theodoulidis, Theodoros

doi:10.1016/j.ndteint.2010.06.003

Cited by 22 publications

(20 citation statements)

References 13 publications

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“…The impedance changes in the defect have different trends in real and imaginary values of the input frequencies. As the frequency increases the defect signal moves in the complex impedance plane in a clockwise direction [5]. It confirms that the result is almost the same as that of the existing studies.…”

Section: An Analysis Of Defects By Impedance Changesupporting

confidence: 89%

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Comparison of ECT Probes in Diagnosis of Defects

Mun¹,

Kim²

2014

Journal of Electrical Engineering and Technology

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Section: An Analysis Of Defects By Impedance Changesupporting

confidence: 89%

“…To verify the validity of the research, the analysis method was based on the analysis of existing model in former studies with conductivity 22.5 MS/m plate [5]. Also, the dimensions of the Impedance probe coil and defect are shown in Table 2, and the analytical model -a 3D modelis shown in Fig.…”

Section: An Analysis Of Defects By Impedance Changementioning

confidence: 99%

Comparison of ECT Probes in Diagnosis of Defects

Mun¹,

Kim²

2014

Journal of Electrical Engineering and Technology

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“…The model is developed from recent works [8], [9], and it addresses this modeling in a scalable and fast manner. Any number of layers can be treated, and also there is no constraint about the material conductivities and about the number of cracks.…”

Section: Introductionmentioning

confidence: 99%

“…Such a modeling of a plate structure for nonmagnetic, linear, and isotropic media was already introduced some time ago [13], but a recent contribution has extended its limits [8]. That is, it is now amenable to a wider crack opening and arbitrary crack profile, with significant speed-up of the procedure overall.…”

Section: Introductionmentioning

confidence: 99%

“…First, the analytical BEM model is described in the general case of a planarly layered structure which contains multiple, parallel or orthogonal thin cracks, as an elaborate extension of previous works [8], [9]. Particular attention is given to the calculation of the respective dyadic Green functions, and the numerical calculation of different SIs using GPOF is detailed.…”

Section: Introductionmentioning

confidence: 99%

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Eddy Current Modeling of Narrow Cracks in Planar-Layered Metal Structures

et al. 2012

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Eddy current testing (ECT) of narrow cracks is an important issue in several industrial areas. Efficient modeling tools are required in order to better interpret measurements, to design adapted probes, and to assess the reliability of testing procedures. A dedicated boundary element model (BEM) suitable for eddy current inspection of several narrow cracks affecting a planar-stratified conductive medium is proposed. The cracks' openings can be arbitrarily small, and their respective orientations be along parallel or orthogonal directions. The approach alleviates most of the computational difficulties of classical methods in such peculiar cases. Comparisons of the results with experimental and simulated data taken from the literature, completed with in-house experiments, illustrate its good accuracy and low computational burden.Index Terms-Discrete complex image method (DCIM), dyadic Green functions (DGF), eddy current testing (ECT), narrow cracks.

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Fast and efficient inversion methods for crack sizing using Bz magnetic signature

Barrarat,

Bensaid,

Rayane

et al. 2023

Int J Numerical Modelling

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Fast estimation is a critical feature of the proposed modeling approach as a “forward” fast solver that has a key role in solving the “inverse” problem involved in crack sizing, especially for real‐time applications. To this end, two different inversion methods have been proposed to estimate the crack depth. The first one uses an interpolation model of the 3D direct model simulation data. The second approach is based on artificial neural networks (ANN). In this article, the rotating uniform eddy current (RUEC) probe is used to detect the normal magnetic component Bz which is defined as the characteristic signal for reconstructing the crack length and depth concurrently. Using the first approach, The Bz characteristic 3D surface is presented, and this can be modeled by a fitted polynomial interpolation equation. Thus, the crack depth can be inverted using this equation referring to the experimental or simulated Bz signal and the crack length. The ANN is outlined to determine the crack depth based on the simulated Bz signature. The move from the first inversion method to the second was flexible and useful, in which the interpolation model is used as a defect signal generator for fast building of a large and efficient database for ANN training. Both of the proposed methods proved the objectivity and accuracy of the inversion results and offered more robust engineering support for automated NDT, reducing production time and increasing productivity.

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Developments in efficiently modelling eddy current testing of narrow cracks

Cited by 22 publications

References 13 publications

Comparison of ECT Probes in Diagnosis of Defects

Comparison of ECT Probes in Diagnosis of Defects

Eddy Current Modeling of Narrow Cracks in Planar-Layered Metal Structures

Fast and efficient inversion methods for crack sizing using Bz magnetic signature

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