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Shear Mode Ultrasonic Transducers from Flexible Piezoelectric PLLA Fibers for Structural Health Monitoring

机译：Shear Mode Ultrasonic Transducers from Flexible Piezoelectric PLLA Fibers for Structural Health Monitoring

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摘要

Shear mode guided waves are highly demanded for underwater structuralhealth monitoring (SHM) applications due to their simplified non-dispersivefeature and minimal acoustic energy loss in the presence of liquid. Excitationand detection of pure shear wave are challenging using conventional piezoelectricmaterials used in the current ultrasonic transducers because theyhave complex piezoelectric responses mixed with multiple longitudinal, transverse,and shear modes. They also suffer from aging issue due to depoling.Here, conformable shear mode ultrasonic transducers are designed andmade of flexible piezoelectric poly (L-lactic acid) (PLLA) fibers on both flat andtubular structures. The electromechanical responses over a macroscopic areaof the transducers are evaluated in a wide frequency range up to 500 kHz.The PLLA fiber-based shear mode ultrasonic transducers exhibit a consistentsensitivity of detecting defects in liquid and air. In addition, the only shearmode in PLLA fibers originates from crystal structure without requiring electricalpoling to render piezoelectricity, thus does not depole due to aging. Thetheoretical analyses including ab initio calculations and experimental resultson both flat and tubular structures show the great potential of PLLA materialand significant advantage of PLLA fiber-based shear mode ultrasonic transducersfor underwater SHM applications.

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