Ceramics-Silikáty 42 (1) 29-38 (1998)

BENDING OF PIEZOELECTRIC ACTUATORS 

F. Kroupa, K. Nejezchleb 

An analytical solution of total deformations and stresses due to piezoelectric deformations and to external force is given for piezoelectric bending actuators composed generally of n layers. The deflection w(L) of the free end and the blocking force P_B are discussed in detail for actuators composed of two or three layers. Actuators made from piezoelectric ceramics show some deviations, i.e. hysteresis and non-linearity, from predicted linear dependence of w(L) on the applied voltage. These deviations are due to the voltage dependence of piezoelectric parameters in this material.

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