Deformation Analysis on Shear-Bending of Ring-Shaped Piezoelectric Actuator

Deformation of a simple single piezoelectric actuator is usually quite small. A ring shaped piezoelectric actuator with large piezoelectrically generated displacement was proposed. The thickness of the actuator was 1 mm, and the inner and outer diameters were 4 mm and 40 ram, respectively. The ring-shaped actuator was made of BiScOa-PbTiOa （BS-PT） ceramic and polarized in radial direction. An electric field was applied to thick ness direction and a large shear-bending deformation emerged. Then Rayleigh-Ritz method and Bessel functions were adopted to analyze the shea〉bending deformation. Results show that under an electric field of 7.5 kV/cm, the maximum displacement at the inner edge of the actuator reached 5.07 μm, which agreed well with the corresponding experimental results.