Soundness Evaluation for Edge of Round Hole Opened in Plate Using Second Harmonic Lamb Waves

The soundness of the edge round hole made in aluminum fl at plate is confi rmed by using second harmonic Lamb wave. To efficiently generate waves S0 mode and detect waves, from velocity dispersion curve we created a probe wedge that has an appropriate critical angle. As result experiment, increases because peripheral part plastically deformed making hole. On other hand, case scratched, scattered. amount components detection would decrease was discussed