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Proceedings Paper

Finite element modeling of multilayered electrostrictive actuators
Author(s): Craig L. Hom; Natarajan Shankar
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Paper Abstract

Nonlinear, quasi-static finite element calculations are performed for multilayered, electrostrictive, ceramic actuators. Both a stand-alone device and an array of devices embedded in a 1 - 3 composite are studied. The numerical model is based on a fully coupled constitutive law for electrostriction which uses strain and polarization as independent state variables. This law accounts for the stress dependency of ceramic's dielectric behavior and simulates polarization saturation at high electric fields. Two-dimensional plane strain computations are done for a single actuator constructed from Pb(Mg1/3Nb2/3)O3- PbTiO3-BaTiO3 (PMN-PT-BT). The stress state near an internal electrode tip is computed and a fracture mechanics analysis is performed to assess the device's reliability. The effect of compressive prestress on the actuator's induced strain response is also predicted. In a second problem, a 1 - 3 composite embedded with an array of PMN-PT-BT multilayered actuators is studied with a plane stress version of the finite element technique. A unit cell model is used to compute the surface displacements of the composite.

Paper Details

Date Published: 5 May 1995
PDF: 10 pages
Proc. SPIE 2442, Smart Structures and Materials 1995: Mathematics and Control in Smart Structures, (5 May 1995); doi: 10.1117/12.208857
Show Author Affiliations
Craig L. Hom, Martin Marietta Labs. (United States)
Natarajan Shankar, Martin Marietta Labs. (United States)

Published in SPIE Proceedings Vol. 2442:
Smart Structures and Materials 1995: Mathematics and Control in Smart Structures
Vasundara V. Varadan, Editor(s)

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