Abstract
Second-harmonic components generated from plastic-deformed metal rods are detected in real time using a double-layered piezoelectric transducer (DLPT). The DLPT is composed of two transducers with the resonance frequency f0; its resonance frequencies are f0/2 when the transducers are connected in parallel and f0 when the transducers are connected in series. The performance of the DLPT used in this ultrasonic system is evaluated. Samples of plastic-deformed metal rods are prepared using tensile test equipment. The relative amplitude of the second-harmonic component of the metal rod increased by approximately 25 dB after the tensile tests compared with that before the tensile tests. The variation in tensile load of the second-harmonic components generated by plastic-deformed metal rods is accurately measured by our system.
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