2 April 2008 Fully-coupled magnetoelastic model for Galfenol alloys incorporating eddy current losses and thermal relaxation
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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.
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Phillip G. Evans, Phillip G. Evans, Marcelo J. Dapino, Marcelo J. Dapino, } "Fully-coupled magnetoelastic model for Galfenol alloys incorporating eddy current losses and thermal relaxation", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 69291W (2 April 2008); doi: 10.1117/12.776485; https://doi.org/10.1117/12.776485
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