Numerical Evaluation of the Depth of Branched-Off Cracks Using Eddy Current Testing Signals

• Published in: IEEE transactions on magnetics Vol. 44; no. 6; pp. 1030 - 1033
• Main Authors: Weiying Cheng, Kanemoto, S., Komura, I.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Aerospace industry; Aerospace testing; Computer simulation; Construction; Cracks; Cross-disciplinary physics: materials science; rheology; depth sizing; Eddy current testing; Electrical capacitance tomography; Exact sciences and technology; Inspection; Inverse problems; Magnetism; Materials science; Mathematical models; Optimization; optimization methods; Other topics in materials science; Physics; Power engineering; Scattering parameters; Sizing; Surface cracks; Surface morphology; Cracks; depth sizing; optimization methods; Eddy currents; Eddy current testing; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2007.914881

Numerical simulation shows that eddy current testing (ECT) signal of a branched-off crack is much larger than that of a same deep, single crack. To avoid the overestimation of the depth of a branched-off crack, a depth sizing index, which is designed to have maximum sensitivity to crack depth, is constructed based on an optimization approach, and the depths of branched-off cracks are estimated using this index. This depth sizing approach is numerically and experimentally validated.