Abstract
Detections of second harmonic components generated from micro 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 received waveforms from the plate had fatigue test of 100,000 and 200,000 cycles, second harmonic components were increased by 6 dB and 10 dB, respectively, compared with in the plate had 0 cycles. Their waveforms and spectra were captured in real time by our DLPT system. Detection of second harmonic component is resulted in the useful tool in evaluating defect in the material.
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