Modeling and measurement of piezoelectric fibers and interdigitated electrodes for the optimization of piezofibre composites

Luke Nelson; Chris Bowen; Ron Stevens; Markys Cain; Mark Stewart

doi:10.1117/12.484738

13 August 2003 Modeling and measurement of piezoelectric fibers and interdigitaded electrodes for the optimization of piezofibre composites

Luke Nelson, Chris Bowen, Ron Stevens, Markys Cain, Mark Stewart

Author Affiliations +

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.484738
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

Commercially available PZT-5A composition fibres fabricated using four production methods were incorporated into 1-3 composites with fibre volume fractions ranging from 0.02 to 0.72. Measurements of the piezoelectric induced strain constants (d33 and d31), relative dielectric constants (e33), longitudinal coupling factors (k33) and stiffness' (s33) of the varying volume fraction composites are compared to analytical expressions in order to extract the fibre properties. Results show 1-3 composite data accurately follows the analytical trends. The Viscous Plastic Process (VPP) fibres are found to exhibit optimum material properties, which approach bulk material values. Reduced piezoelectric activity in extruded fibres is thought to be associated with a small grain size and high porosity. A second study, an optimisation of interdigitated electrode design, was performed using the finite element software ANSYS. The effect of the IDE geometry (electrode width and spacing) and PZT substrate thickness on the strain output of bulk PZT substrates was modelled. Results show optimal actuation occurs at electrode widths equal to half the substrate thickness, and for thin substrates the electrode finger spacing can be reduced to enable lower driving voltages.

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Luke Nelson, Chris Bowen, Ron Stevens, Markys Cain, and Mark Stewart "Modeling and measurement of piezoelectric fibers and interdigitaded electrodes for the optimization of piezofibre composites", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.484738

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