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A nonlinear modulation technique used to inspect flaws: Electromagnet-caused modulation

  • Acoustic Methods
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Abstract

Different mechanisms of local modulation of acoustic characteristics of model flaws (crack, notch) caused by a U-type electromagnet are considered with reference to a nonlinear modulation acoustic technique of crack detection. The results of an experiment on notch modulation performed by means of bending an object’s surface and applying a magnetic field and tangential forces to the surface near the foot of an electromagnet, depending on the electromagnet orientation with respect to the notch plane and amplitude of its excitation, are discussed. The specific features of two-dimensional detection of individual cracks (closed and half-open) in metal plates by linear and nonlinear techniques are discussed.

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Authors and Affiliations

  1. Institute of Applied Physics, Russian Academy of Sciences, ul. Ul’yanova 46, Nizhni Novgorod, 603950, Russia

    V. V. Kazakov & A. L. Gribkov

Authors
  1. V. V. Kazakov
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  2. A. L. Gribkov
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Original Russian Text © V.V. Kazakov, A.L. Gribkov, 2007, published in Defektoskopiya, 2007, Vol. 43, No. 3, pp. 46–54.

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Kazakov, V.V., Gribkov, A.L. A nonlinear modulation technique used to inspect flaws: Electromagnet-caused modulation. Russ J Nondestruct Test 43, 170–175 (2007). https://doi.org/10.1134/S1061830907030060

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  • DOI: https://doi.org/10.1134/S1061830907030060

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