Abstract
To reduce the error of crack orientation determination in alternating current field measurement, the mechanism of crack detection and crack orientation determination error due to crack width were studied, a crack direction determination formula was proposed, and the accuracy of crack orientation determination was improved. The influence of the sensor sensitive axis and crack size on the magnetic field disturbance amplitude was studied. The relationship between crack orientations and magnetic field disturbance amplitude was deduced, the detection method and orientation determination formula were proposed. Simulation and experimental results show that there is a large determination error using the traditional Bx–By method, a positive correlation was found between the determination error and crack width. The triaxial signal Bx–By–Bxy method proposed in this paper largely reduces the determination error, the experimental result shows that the maximum error is 3.37 degrees.
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This work is supported by National Key Research and Development Program of China under Grant 2017YFF0209701 and the National Natural Science Foundation of China under Grant 51671216, and in part by Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Yan, L., Wan, B., Hu, B. et al. Crack Orientation Determination of 304 Austenitic Stainless Steel Based on Alternating Current Field Measurement. J Nondestruct Eval 41, 58 (2022). https://doi.org/10.1007/s10921-022-00886-x
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DOI: https://doi.org/10.1007/s10921-022-00886-x