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Piezoelectric-electrostrictive monolithic bi-layer composite flextensional actuator

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3 Author(s)
Ngernchuklin, P. ; Dept. of Mater. Sci. & Eng., Rutgers Univ., Piscataway, NJ ; Akdogan, E.K. ; Safari, A.

We propose a new type of flextensional actuator comprised of an electromechanically active element which is a piezoelectric-electrostrictive monolithic bi-layer composite (PE-MBLC) capped by truncated thin brass sheets. The PE-MBLC contains equal amounts of 0.65{Pb(Mg1/3Nb2/3)O3}-0.35PbTiO3 and 0.9{Pb(Mg1/3Nb2/3)O3}-0.1PbTiO3 by volume, and is obtained by a co-sintering process. With applied Emax = 10 kV/cm unipolar drive, the maximum axial displacement (u33) produced by the uncapped and capped PEMBLC is 11 and 21 mum, respectively. The hysteresis in unipolar u33 at 0.5 Emax is 4.6% for the uncapped PE-MBLC, while that for the capped one is 11%. Under bipolar excitation, the maximum u33 for uncapped is 11.6 mum at +Emax and 6.6 mum at -Emax with an asymmetry factor (xi)of 1.75 for which u33 < 0 for all E < 0. Under bipolar excitation, the maximum u33 at +Emax for the capped PE-MBLC is 19 mum while that for -Emax is 8 mum with xi = 2.4, for which u33 > 0 at +Emax but is smaller than the u33 at +Emax. The origins of the observed asymmetry in u33 are discussed in the context of symmetry superposition and deformation mechanics of the endcaps.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:56 ,  Issue: 6 )