Time-dependent behavior in a Terfenol-D actuated visco-elastic polymer matrix composite

William D. Armstrong; Cosmina S. Hogea

doi:10.1117/12.475006

11 July 2002 Time-dependent behavior in a Terfenol-D actuated visco-elastic polymer matrix composite

William D. Armstrong, Cosmina S. Hogea

Proceedings Volume 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics; (2002) https://doi.org/10.1117/12.475006
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

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.

Citation Download Citation

William D. Armstrong and Cosmina S. Hogea "Time-dependent behavior in a Terfenol-D actuated visco-elastic polymer matrix composite", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); https://doi.org/10.1117/12.475006

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