Study by laser interferometry of the resonance modes of the shear plate used in the standards characterization of piezoceramics

摘要

Recent Finite Element Analysis (FEA) modeling of a Standard shear plate of Navy II type PZT-based ceramics was carried out based on the full matrix material characterization Material coefficients in the linear range, including all losses, were obtained by an iterative automatic method from impedance measurements at resonance. FEA modeling has shown that the shear plate used in the standard characterization of piezoceramics is dynamically clamped at resonance, which results in an underestimation of the related shear coefficients. This work aims to examine experimentally the resonance modes of such standard shear sample by the use of the laser interferometry technique to map the displacement pattern at its free surfaces.