Eddy current inspection of closed fatigue and stress corrosion cracks

Yusa, Noritaka; Perrin, Stéphane; Mizuno, Kazue; Chen, Zhenmao; Miya, Kenzo

doi:10.1088/0957-0233/18/11/021

Cited by 51 publications

(20 citation statements)

References 12 publications

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“…Most modern EC testers are hand-held devices. [92][93][94] ECs are sensitive to the electrical conductivity, magnetic permeability, geometry of the component and defects. This method applies only to electrically conductive materials.…”

Section: Eddy Currentmentioning

confidence: 99%

Non-destructive techniques for corrosion detection: A review

Vasagar,

Hassan,

Abdullah

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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Corrosion detection (CD) has become a high priority in chemical industries, defense and transportation sectors to extend the life of existing or new systems while ensuring the safety of the existing components and reducing downtime to minimise economic losses. Here, this article is aimed to review and discuss non-destructive techniques used widely in the industry to detect, monitor and repair corrosion problems early on. The comprehensive review provides a detailed discussion, a functional mechanism, advantages and disadvantages of crucial non-destructive CD techniques widely used in the industry, helping the reader choose the type of corrosion monitoring methods effectively. An extensive literature review of visual and optical testing techniques, acoustic emissions, eddy current, guided wave and equipment, infrared thermography, radiographic, microwave and millimeter wave, and terahertz imaging is discussed. The underlying mechanism, its merits and limitations, along with the usage scenario, is explained that can be related across different areas making it interdisciplinary research for corrosion monitoring techniques.

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Section: Eddy Currentmentioning

confidence: 99%

Non-destructive techniques for corrosion detection: A review

Vasagar,

Hassan,

Abdullah

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…Plus-point sensors, which are a type of differential sensors, were used in this study [11]. The plus-point sensors crossed the "I"-shaped coils crosswise to differentially detect the defects; as the lift-off (the gap between the specimen and the sensor) changes, the crossed coils are simultaneously affected and canceled, thus minimizing the effect of lift-off and reducing noise [12,13]. Furthermore, defects in various directions rather than in one direction can be detected [14].…”

Section: Ch Eddy Current Sensorsmentioning

confidence: 99%

Natural Rail Surface Defect Inspection and Analysis Using 16-Channel Eddy Current System

Kwon¹,

Lee²,

Park³

et al. 2021

Applied Sciences

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Trains are used as the fastest mode of transportation for both people and cargo. The train moves along a special path called 'rail,' where fatigue can be accumulated due to wheel-rail contact load as a result of continuous train operation. Consistent and regularly scheduled safety management is required since corrosion rate of the rails located on outside environment is very high. Researchers have actively investigated and developed rail defect inspection systems employing non-destructive techniques to address these problems. In particular, the eddy current inspection technique does not involve contact with the surface of the test specimen and offers the advantage of excellent rail defect detection sensitivity. Therefore, a 16 Ch array eddy current inspection device was developed to inspect the surface defects of the rail. An equation was derived to predict the correlation between the depth and phase of an artificial defect using the eddy current inspection device, and the derived equation was applied to the natural defect specimen.

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“…Up to now, the sizing of SCC in key structural components is conducted using ultrasonic testing (UT) [5,6], eddy current testing (ECT), etc [7][8][9][10][11][12]. UT is the major NDT tool for SCC sizing in nuclear power plants.…”

Section: Introductionmentioning

confidence: 99%

Quantitative evaluation of electrical conductivity inside stress corrosion crack with electromagnetic NDE methods

Cai

Jomdecha

Zhao

et al. 2020

Phil. Trans. R. Soc. A.

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This paper presents a comparison of studies on the local distributed electrical conductivity in stress corrosion crack (SCC) from signals of eddy current testing (ECT) and direct current potential drop (DCPD) aiming to improve SCC sizing accuracy when using electromagnetic non-destructive testing (NDT) methods. Experimental setups of ECT and DCPD were established, respectively, to collect measurement signals due to artificial SCCs in a plate of austenitic stainless steel. The local conductivity in the SCC region was reconstructed from the feature parameters extracted from the measured ECT and DCPD signals through inverse analyses. The inversion strategies for ECT and DCPD, each including an efficient forward simulation and an optimization scheme, were introduced from the viewpoint of conductivity reconstruction. Inversion results obtained from the measured ECT and DCPD signals showed the consistent trend which proved the validity of the predicted electrical conductivity indirectly. It is clarified that the electrical conductivity in a SCC is relatively high at the crack tip area and may become as high as 17% of that of the base material. These results provide a good reference to enhance the sizing accuracy of SCC with an electromagnetic NDT method such as ECT by updating the conductive crack model based on the results of this work. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Eddy current inspection of closed fatigue and stress corrosion cracks

Cited by 51 publications

References 12 publications

Non-destructive techniques for corrosion detection: A review

Non-destructive techniques for corrosion detection: A review

Natural Rail Surface Defect Inspection and Analysis Using 16-Channel Eddy Current System

Quantitative evaluation of electrical conductivity inside stress corrosion crack with electromagnetic NDE methods

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