Defect localization and characterization in eddy current nondestructive testing by change detection and global optimization

Kermadi, Majda; Moussaoui, Saïd; Brahimi, Abdelhalim Taieb; Féliachi, Mouloud

doi:10.1108/compel-05-2017-0201

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…In this paper, ANSYS simulation software is used to establish a 3D finite element (Kermadi et al , 2018; Yang and Yoon, 2001) simulation model for the RFECT of aluminum plate specimens with damping coating. The magnetic circuit and magnetic field shielding structure of planar RFEC sensor are optimized systematically.…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimental study of remote field current testing for hidden defects of aluminum alloy plate with damping coating

Jiang¹,

Lu²,

Wang³

et al. 2022

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Purpose Detection of hidden defects of aluminum alloy plate with damping coating is a challenging problem. At present, only a few non-destructive testing methods exist to address this engineering problem. Without the restriction of skin effect, remote field eddy current (RFEC) overcomes the interference caused by the damping coating. The RFEC, which has potential advantages for detecting the hidden defects of aluminum plate with damping coating, can penetrate the metal plate to detect buried depth defects. This study aims to test how thick the RFEC sensor can penetrate the metal plate to detect the buried defects. Design/methodology/approach The magnetic field distribution characteristics are analyzed, the magnetic field intensity distribution is calculated, and the structure and parameters of the coil, magnetic circuit and shielding damping are determined through the two- and three-dimensional finite element simulation methods. Optimal excitation frequency is obtained, and the distance between the excitation coil and detection coil is determined by analyzing the relationship between excitation frequency and remote field points. Findings Simulation and experimental results verify the feasibility of applying the RFEC detection technology in detecting the hidden defects of aluminum alloy plate with damping coating. Originality/value In this paper, the RFEC testing model of hidden defects in aluminum plate sample with damping coating is established by using the finite element method.

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Section: Introductionmentioning

confidence: 99%

Simulation and experimental study of remote field current testing for hidden defects of aluminum alloy plate with damping coating

Jiang¹,

Lu²,

Wang³

et al. 2022

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“…This method is easy to implement, sensitive, robust and eco-aware. It allows characterizing defects (Kermadi et al, 2018;Le Diraison et al, 2009) or evaluating physical parameters under certain conditions (Vernon, 1989) with sufficient accuracy. However, it is still an "ill-posed" problem and limited in applications .…”

Section: Introductionmentioning

confidence: 99%

A model-based approach for inspection of aeronautical multi-layered structures by eddy currents

Cung

Nguyen

Joubert

et al. 2019

COMPEL

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Purpose The purpose of this paper is to propose an approach, which is easy to implement, for estimating the thickness of the air layer that may separate metallic parts in some aeronautical assemblies, by using the eddy current method. Design/methodology/approach Based on an experimental study of the coupling of a magnetic cup core coil sensor with a metallic layered structure (consisting of first metal layer/air layer/second metal layer), which is confirmed by finite element modelling simulations, an inversion technique relying on a polynomial forward model of the coupling is proposed to estimate the air layer thickness. The least squares and the nonnegative least squares algorithms are applied and analysed to obtain the estimation results. Findings The choice of an appropriate inversion technique to optimize the estimation results is dependent on the signal-to-noise ratio of measured data. The obtained estimation error is smaller than a few percent, for both simulated and experimental data. The proposed approach can be used to estimate both the air layer thickness and the second metal layer thickness simultaneously/separately. Originality/value This model-based approach is easy to implement and available to all types of eddy current sensors.

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“…The non-destructive evaluation (NDE) of metal massive structures by eddy current (EC) technique is widely considered in industry. It allows characterizing defects [1][2][3] or evaluating physical parameters under certain conditions 4,5 with sufficient accuracy. However, it is still an "ill-posed" problem and limited in applications 6,7 due to the difficulty of feature extraction and the complex of algorithm of inverse problem solution.…”

Section: Introductionmentioning

confidence: 99%

A model-based approach for estimation of the crack depth on a massive metal structure

Cung

Dao

Nguyen

et al. 2018

Measurement and Control

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This paper deals with the eddy current technique for nondestructive evaluation of the crack depth on a massive specimen used in aeronautical industry. A set of C-scan eddy current images is analyzed to reduce the noise and to select suitable features, which can be used to estimate the crack depth. Based on this study, a method relying on polynomial forward models of the relationship between crack depth and the maximum value of the sensor impedance is proposed. The least square and the non-negative least square techniques are applied to analyze the usability of proposed models. The error of obtained estimations is smaller than 10%, for almost used experimental data.

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Defect localization and characterization in eddy current nondestructive testing by change detection and global optimization

Cited by 5 publications

References 37 publications

Simulation and experimental study of remote field current testing for hidden defects of aluminum alloy plate with damping coating

Simulation and experimental study of remote field current testing for hidden defects of aluminum alloy plate with damping coating

A model-based approach for inspection of aeronautical multi-layered structures by eddy currents

A model-based approach for estimation of the crack depth on a massive metal structure

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