Equations of state including the thermal domain of piezoelectric and pyroelectric heterogeneous bimorphs

The equations of state for piezoelectric bimorphs made of a piezoelectric and a non-piezoelectric material have been determined. As these bimorphs are nonsymmetric they suffer from considerable temperature sensitivity due to the difference in thermal expansion coefficients of the constituting materials. The deflection, rotation, volume displacement, charge on the electrodes and the entropy change have been calculated for the heterogeneous bimorph.

Keywords:

• constituent equations
• bimorphs
• piezoelectric bimetallic
• bimaterial
• actuators