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Slots vs. cracks in eddy current NDE

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Abstract

The thin-skin theory of Lewis, Michael, Lugg, and Collins (LMLC) is applied to an analysis of the effects of slot closure on eddy current response. The LMLC model is shown to lead to a relatively simple expression for the ratio of the impedance change for an open slot to the impedance change for a closed slot, which represents a crack. Numerical calculations for a nonmagnetic material show that the impedance ratio is an almost linear function of the slot opening in skin depth units, and is relatively insensitive to slot length and aspect ratio. For ferromagnetic materials with large relative permeability, there is no significant slot closure effect. LMLC calculations are supplemented by volume integral calculations at low frequencies where the thin-skin theory fails.

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Authors and Affiliations

  1. Southwest Research Institute, 78228, San Antonio, Texas

    R. E. Beissner

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  1. R. E. Beissner
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Beissner, R.E. Slots vs. cracks in eddy current NDE. J Nondestruct Eval 13, 175–183 (1994). https://doi.org/10.1007/BF00742583

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  • DOI: https://doi.org/10.1007/BF00742583

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