Abstract
Detections of second-harmonic components generated from fatigue-tested plates using finite amplitude Lamb waves were carried out using a double-layered piezoelectric transducer (DLPT) with a pulse-echo method. Three pure magnesium (Mg) plates subjected to fatigue tests of 0, 1×105, and 2×105 cycles were used in this experiment. In a received waveform from the plate subjected to the fatigue test of 2×105 cycles, a second-harmonic component was increased by 10 dB compared with that in the case of an unstressed plate. The usefulness of the DLPT system for detecting second-harmonic components of Lamb waves in the pulse-echo method was confirmed.