Abstract
The fundamental shear horizontal (SH0) wave is highly desired for structural health monitoring (SHM) applications because of its advantageous non-dispersive, and minimal energy loss properties. However, the generation and detection of a pure SH0 wave solely using traditional piezoelectric materials possess a considerable challenge owing to their complex piezoelectric response. To effectively address this issue, a new piezoelectric crystal GdBa3(PO4)3 (GdBP) featuring a pure face-shear vibration mode was successfully grown using the Czochralski method. Notably, The GdBP crystal showcases a stronger shear piezoelectric strain coefficient (d14=15.2 pC/N), surpassing some of the extensively studied crystals. A GdBP-based SH0 wave transducer was first designed guided by the numerical simulation. The experiment results show the functions of exciting and detecting stable SH0 wave signals along four main directions (i.e. 0°, 90°, 180°, and 270°) with the operation temperature exceeding 500 °C, and further manifest the reliable capability in defect detection. Our results highlight the great potential of GdBP-based SH0 wave piezoelectric transducer and lead to an effective SHM applications, particularly in harsh environments.
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