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On-line measurement of plastic strain ratio of steel sheet using resonance mode EMAT

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Abstract

We have developed an on-line system for the measurement of plastic strain ratio of steel sheet using a thickness resonance EMAT that measures the thickness resonance frequencies of three different modes of bulk ultrasonic waves. The effective size of the EMAT is small, about 20 mm in diameter. A good correspondence was obtained between the in-plane average Young's modulus measured by this method and the in-plane average plastic strain ratio measured by tensile testing, with a standard deviation smaller than 0.04 in units of plastic strain ratio. The effects of temperature, lift-off, tensile stress, speed of the moving sheet and zinc coats were experimentally and theoretically analyzed. We show that none of them have a sizable effect on the measurement accuracy.

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Authors and Affiliations

  1. Applied Electronics Laboratory, Electronics Research Laboratories, Nippon Steel Corporation, 5-10-1 Fuchinobe, 229, Sagamihara, Kanagawa, Japan

    Katsuhiro Kawashima, Takao Hyoguchi & Toshio Akagi

Authors
  1. Katsuhiro Kawashima
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  2. Takao Hyoguchi
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  3. Toshio Akagi
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Kawashima, K., Hyoguchi, T. & Akagi, T. On-line measurement of plastic strain ratio of steel sheet using resonance mode EMAT. J Nondestruct Eval 12, 71–77 (1993). https://doi.org/10.1007/BF00565910

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  • DOI: https://doi.org/10.1007/BF00565910

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