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Proceedings Paper

Fully-coupled magnetoelastic model for Galfenol alloys incorporating eddy current losses and thermal relaxation
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Paper Abstract

A general framework is developed to model the nonlinear magnetization and strain response of cubic magnetostrictive materials to 3-D dynamic magnetic fields and 3-D stresses. Dynamic eddy current losses and inertial stresses are modeled by coupling Maxwell's equations to Newton's second law through a nonlinear constitutive model. The constitutive model is derived from continuum thermodynamics and incorporates rate-dependent thermal effects. The framework is implemented in 1-D to describe a Tonpilz transducer in both dynamic actuation and sensing modes. The model is shown to qualitatively describe the effect of increase in magnetic hysteresis with increasing frequency, the shearing of the magnetization loops with increasing stress, and the decrease in the magnetostriction with increasing load stiffness.

Paper Details

Date Published: 2 April 2008
PDF: 12 pages
Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 69291W (2 April 2008); doi: 10.1117/12.776485
Show Author Affiliations
Phillip G. Evans, The Ohio State Univ. (United States)
Marcelo J. Dapino, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 6929:
Behavior and Mechanics of Multifunctional and Composite Materials 2008
Marcelo J. Dapino; Zoubeida Ounaies, Editor(s)

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