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

Abstract

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