Abstract
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.
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