Numerical investigation of the ability of eddy current testing to size surface breaking cracks

Yusa, Noritaka; Hashizume, Hidetoshi

doi:10.1080/10589759.2015.1135918

Cited by 14 publications

(1 citation statement)

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“…Eddy current testing (ECT) which is based on the principle of electromagnetic induction is regarded as an effective nondestructive testing method [1]. It can be used to detect surface [2,3] and subsurface [4,5] defects in conductive materials and measure thicknesses [6,7] of metallic plates.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate

Zeng

Ding

et al. 2019

Chin. J. Mech. Eng.

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In eddy current testing, the law of attenuation of eddy current (EC) is of great concern. In conductive half space under the excitation of uniform magnetic field, the EC density decreases exponentially in the depth direction. However, in conductor with finite thickness tested by coil, the distribution of EC in the depth direction is more complicated. This paper studies the characteristics of EC attenuation in metallic plate of finite thickness. Simulation results show that there is an EC reflection at the bottom of plate, which changes the law of EC attenuation. A new concept, namely the equivalent attenuation coefficient, is proposed to quantify the speed of EC attenuation. The characteristics of EC attenuation are utilized to explain the nonmonotonic relation between coil voltage and plate thickness. Procedure of selecting frequency is discussed. Thereafter, measurement of plate thickness is carried out and accurate result is obtained.

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Section: Introductionmentioning

confidence: 99%