New microfocus bremsstrahlung source based on betatron B-18 for high-resolution radiography and tomography

Rychkov, M. M.; Kaplin, V. V.; Malikov, Evgeniy; Smolyanskiy, V. A.; Stepanov, I.B.; Lutsenko, A.S.; Gentsel’man, V.; Vaskovskiy, I. K.

doi:10.1088/1757-899x/289/1/012044

Cited by 3 publications

(1 citation statement)

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“…One of the main obstacles in detecting corrosion by a typical NDT method, visual testing (VT), is that the steel bars are usually inside the RC structures. Except for VT, studies over the past three decades have provided many practical NDT methods on metals, such as ultrasonic diffraction time difference (TOFD) [5], acoustic emission (AE) [6][7][8], ultrasonic testing (UT) [9][10][11], radiographic testing (RT) [12], and electromagnetic detection. Among these methods, electromagnetic detection has been popular in recent years.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of Corrosion Degrees of Steel Bars Based on Self-Magnetic Flux Leakage

Yang

Qiu

Di³

et al. 2019

Metals

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Corrosion is among the most critical factors leading to the failure of reinforced concrete (RC) structures. Less work has been devoted to nondestructive tests (NDT) to detect the corrosion degree of steel bars. The corrosion degree was investigated in this paper using an NDT method based on self-magnetic flux leakage (SMFL). First, a mathematic model based on magnetic dipole model was settled to simulate the SMFL of a V-shaped defect caused by corrosion. A custom 3-axis scanning device equipped with a magnetometer was used to scan the SMFL field of the 40 corroded steel bars. Experimental data obtained by scanning the 40 steel bars showed that the BZ curve of SMFL was consistent with the theoretical model analysis. Inspired by the qualitative analysis of the results, an index “K” based on a large number of experimental data was established to characterize the corrosion degree of steel bars. The experimental index “K” was linearly related to the corrosion degree α of steel bars. This paper provides a feasible approach for the corrosion degree NDT, which is not affected by the magnetization history and the initial magnetization state of steel bars.

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