Piezoelectric-electrostrictive monolithic bi-layer composite flextensional actuator

Piyalak Ngernchuklin, E. Koray Akdoǧan, Ahmad Safari

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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 m, 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 m at +Emax and 6.6 μm at -E max with an asymmetry factor ξ of 1.75 for which u33 33 at +Emax for the capped PE-MBLC is 19 m while that for -E max is 8 m with ξ = 2.4, for which u33 > 0 at -E max 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.

Original languageEnglish (US)
Article number5075095
Pages (from-to)1131-1138
Number of pages8
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number6
StatePublished - Jun 2009

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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