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Proceedings Paper

Time-dependent behavior in a Terfenol-D actuated visco-elastic polymer matrix composite
Author(s): William D. Armstrong; Cosmina S. Hogea
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Paper Abstract

The present paper develops a one dimensional magneto-elastic model of a magnetostrictive fiber actuated polymer matrix composite material which accounts for a strong visco-elastic response in the polymer matrix. The visco-elastic behavior of the composite polymer matrix is modeled with a three parallel Maxwell element visco-elastic model, the magneto-elastic behavior of the composite fibers is modeled with an anhysteric directional potential based domain occupation theory. Example calculations are performed to identify and explain the dynamical behavior of the composite. We observed that the increasing and decreasing limbs of the magnetization and magnetostriction loops are offset at middle levels of applied field. This offset is a consequence of the interaction of the time varying fiber stress caused by matrix viscosity with a multi-domain state in the fiber. The small increase in fiber longitudinal compressive stress due to matrix viscosity under increasing field inhibits the occupation of domains with magnetization orientations near the fiber longitudinal direction. As a consequence, the summed longitudinal magnetization and magnetostriction is reduced as compared to the decreasing field limb. This results in an apparent hysteresis loop in the magnetization and magnetostriction curves even though the model does not include magneto-elastic hysteresis in the fibers.

Paper Details

Date Published: 11 July 2002
PDF: 11 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.475006
Show Author Affiliations
William D. Armstrong, Univ. of Wyoming (United States)
Cosmina S. Hogea, SUNY/Binghamton (United States)


Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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