Summary: J. Am. Ceram. Soc., 80 [5] 1073­78 (1997)
Scaling Analysis for the Axial Displacement and Pressure of
Flextensional Transducers
Wan Y. Shih,,
Wei-Heng Shih,*,
and Ilhan A. Aksay*,
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544­5263
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104­2875
We have examined the axial displacement, h, and maxi- varying the thickness of the metal end cap and/or the diameter
mum axial pressure, Pmax, of flextensional transducers such of the piezoelectric disk, axial displacements as high as 8% of
as the moonies and the rainbows with both scaling and the thickness of the metal end cap have been achieved at the
mechanical analyses. For a constant electric field E across center of the metal end cap.3
The rainbow is an oxide piezoelec-
the transducer, h/t E/t2
where t is the thickness of the tric disk such as lead-lanthanum-zirconate-titanate (PLZT) with
rainbow or the thickness of the metal end cap of the moonie one of the two faces of the disk reduced. The cross-section view
and h/t, the relative axial displacement. Thus, for a con- of a rainbow is schematically shown in Fig. 1(b).2
An axial dis-
stant voltage V across the transducer, h/t V/t3

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

Collections: Materials Science