31 March 2009 Measurement and modeling of magnetomechanical coupling in magnetostrictive iron-gallium alloys
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Abstract
Measurements are performed to characterize the nonlinear and hysteretic magnetomechanical coupling of iron-gallium (Galfenol) alloys. Magnetization of production and research grade Galfenol is measured under applied stress at constant field, applied field at constant stress, and alternately applied field and stress. A high degree of reversibility in the magnetomechanical coupling is observed by comparing a series of applied field at constant stress experiments with a single applied stress at constant field experiment. Accommodation is not evident and magnetic hysteresis for both applied field and stress is shown to be coupled. A stress, field, and orientation dependent hysteron is developed from continuum thermodynamics which employs a unified hysteresis mechanism for both applied stress and field. The hysteron has an instantaneous loss mechanism similar to Coulomb-friction or Preisach-type models and is shown to satisfy the second law of thermodynamics. Stochastic homogenization is employed to account for the smoothing effect that material inhomogeneities have on the magnetization.
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Phillip G. Evans, Marcelo J. Dapino, "Measurement and modeling of magnetomechanical coupling in magnetostrictive iron-gallium alloys", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 72891X (31 March 2009); doi: 10.1117/12.815826; https://doi.org/10.1117/12.815826
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