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Detections of second harmonic components generated from closed cracks created by fatigue tests using finite amplitude Lamb wave were carried out using double-layered piezoelectric transducer (DLPT) with pulse-echo method. Three pure magnesium (Mg) plates applied to fatigue test were used in this experiment. In a received waveform from the plate had fatigue test of 2 × 105 cycles, second harmonic component was increased by 6 dB compared with in the plate had 0 cycles. Thus, it was confirmed that second harmonic components detection system using DLPT was effective for detecting dislocations and closed cracks in the plates.
SICE Annual Conference (SICE), 2011 Proceedings of
Date of Conference: 13-18 Sept. 2011