Harmonic Imaging of Plastic Deformation in Thin Metal Plates Using Nonlinear Ultrasonic Method

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概要

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• Plastic deformation in perforated SUS 304 steel strips is imaged by an immersion resonant higher harmonic technique. The higher harmonic components are extracted from resonant waveforms received through a high-pass filter. Plastic zones are imaged by higher harmonic amplitude and delay time from the start of resonance to the peak amplitude. The higher harmonic amplitude corresponds well to the extent of plastic deformation; namely, it is highest in highly deformed regions and lowest in un-deformed regions. This technique could be applied to evaluate material degradation before crack initiation.

• 2011-07-25

著者

• Kawashima Koichiro

  Ultrasonic Materials Diagnosis Lab.

• Kawashima Koichiro

  Ultrasonic Materials Diagnosis Laboratory Ltd., Nagoya 466-0062, Japan

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