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A New Micro Magnetic Bridge Probe in Magnetic Flux Leakage for Detecting Micro-cracks

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Abstract

Magnetic flux leakage (MFL) testing has been widely used as an efficient non-destructive testing method to detect damage in ferromagnetic materials. It’s of great importance to improve the testing capability of MFL sensors. In this paper, a micro magnetic bridge method in MFL of high sensitivity is proposed to detect micro-cracks. This method consists of a micro magnetic bridge core and an induction coil. Furthermore, a novel micro magnetic bridge probe (MMBP) of higher spatial resolution is designed and developed with \(10~\upmu \hbox {m}\) width between the two sides of this MMBP in the testing magnetic bridge. The lift-off effect of this new MMBP is studied via finite element method and experimental verification. The results show this MMBP can achieve high sensitivity only when working with a micro-lift-off value. To examine the detecting capability of this MMBP, micro-cracks in magnetic particle inspection sensitivity testing pieces are all inspected, and the lowest depth value is only \(7~\upmu \hbox {m}\). The MMBP in this paper improves the testing capability of MFL to the micrometre scale and can be widely used to detect grinding micro-cracks in bearing rings.

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Authors and Affiliations

  1. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Erlong Li, Yihua Kang & Jian Tang

  2. School of Manufacturing Science and Engineering, Sichuan University, Chengdu, 610065, China

    Jianbo Wu

Authors
  1. Erlong Li
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  2. Yihua Kang
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  3. Jian Tang
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  4. Jianbo Wu
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Correspondence to Erlong Li.

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Li, E., Kang, Y., Tang, J. et al. A New Micro Magnetic Bridge Probe in Magnetic Flux Leakage for Detecting Micro-cracks. J Nondestruct Eval 37, 46 (2018). https://doi.org/10.1007/s10921-018-0499-8

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  • DOI: https://doi.org/10.1007/s10921-018-0499-8

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