Abstract
The plastic zone in front of a small fatigue crack in an SM 400 steel plate of 4 mm thickness is imaged by immersion local resonance technique, in which a plate sample is excited to resonance vibrations in the thickness direction by long-tone burst waves of large amplitude and a high-pass filter extracts higher-harmonic components from the received ultrasonic signal. For a sample with Luders’ lines, the crack tip plastic zone and cracked area are clearly imaged by the 5th harmonic amplitude of the incident resonance frequency. Also, a higher-harmonic time-delay image exhibits the crack tip plastic zone.
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