Multi-source effect in magnetizing-based eddy current testing sensor for surface crack in ferromagnetic materials

Deng, Zhiyang; Kang, Yihua; Zhang, Jikai; Song, Kai

doi:10.1016/j.sna.2018.01.009

Cited by 28 publications

(10 citation statements)

References 43 publications

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“…According to the equivalent source method, the defect is equivalent to a current source and the disturbed field caused by the crack is equivalent to a field due to the equivalent current source. In the MB-ECT method, the total disturbed field mainly consists of the disturbed field caused by the crack, the disturbed field caused by the permeability distortion, and the magnetic leakage field, which is equivalent to the current source

, as described in Equations (8) and (9) [ 28 ]. Actually, the skin effect always limits the eddy current to reach the far-side surface defect (buried depth > three times penetration depth) even if the permeability decreases to one, and then Equation (5) can be expressed as Equation (10).…”

Section: Discussionmentioning

confidence: 99%

Mechanism of Magnetic Permeability Perturbation in Magnetizing-Based Eddy Current Nondestructive Testing

Deng

Yuan

et al. 2022

Sensors

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DC magnetization is generally considered to suppress the usual local magnetic permeability variation and increase the penetration depth for magnetizing-based eddy current testing (MB-ECT) of ferromagnetic materials. In fact, such simple explanations lead to rough nondestructive evaluation and cause new neglected non-uniform magnetic characteristics. Hence, the “perturbation” of the internal magnetic field variation is analyzed using a magnetic dipole model and the mechanism of magnetic permeability perturbation in MB-ECT is revealed. The theoretical analysis and simulations show that a significant permeability perturbation always appears around a defect and presents opposite features with strong and weak magnetization. Furthermore, experimental results indicate that the hidden signal component arising from the local permeability perturbation is critical for both far-side surface and near-side surface defects in the MB-ECT method.

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Section: Discussionmentioning

confidence: 99%

Mechanism of Magnetic Permeability Perturbation in Magnetizing-Based Eddy Current Nondestructive Testing

Deng

Yuan

et al. 2022

Sensors

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“…Moreover, the precision of estimation results is also analyzed through the relative error-RE, defined as in equation (12)…”

Section: Implementation Of the Inversionmentioning

confidence: 99%

“…3,[8][9][10] Recently, there are many reports on the PEC thermography technique. Most of them aim to detect and localize cracks in different structures and materials, for example, in alloy plates, 11 in ferromagnetic materials, 12,13 in aeronautical structures, 14,15 or in carbon fiber-reinforced plastic. 16,17 Many other works focus on the improvement of the defect detection efficiency through the improvement of feature extraction or image processing algorithms.…”

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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“…Thus, for example, ACFM has been used to detect and characterize cracks in tubes and pipe strings [9,10]. Eddy current techniques can detect surface and near surface cracks [11] and cracks near faster holes [12], and also to measure metal thickness [13], quantify pocket length of an angled crack [14], and detect fibre waviness in carbon fibre composite [15].…”

Section: Introductionmentioning

confidence: 99%

A capacitive-inductive dual modality imaging system for non-destructive evaluation applications

Yin

et al. 2020

Mechanical Systems and Signal Processing

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Multi-source effect in magnetizing-based eddy current testing sensor for surface crack in ferromagnetic materials

Cited by 28 publications

References 43 publications

Mechanism of Magnetic Permeability Perturbation in Magnetizing-Based Eddy Current Nondestructive Testing

Mechanism of Magnetic Permeability Perturbation in Magnetizing-Based Eddy Current Nondestructive Testing

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

A capacitive-inductive dual modality imaging system for non-destructive evaluation applications

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