2 April 2008 Fully-coupled model for the direct and inverse effects in cubic magnetostrictive materials
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A fully-coupled, nonlinear model is presented that characterizes the 3-D strain and magnetization response of magnetostrictive materials to magnetic fields and mechanical stresses. The model provides an efficient framework for characterization, design, and control of Galfenol (Fe1-xGax) devices with 3-D functionality subjected to combined magnetic field and stress loading. A thermodynamic approach is taken to determine possible domain orientations considering the magnetocrystalline anisotropy, magnetomechanical, and Zeeman energies. The domain configuration is determined through minimization of the total Gibbs energy of a collection of domains. To incorporate material texture, the orientation of the applied field and stress with respect to the local crystal orientation is included as a statistically distributed parameter. Hysteresis due to irreversible domain wall motion is modeled by accounting for the energy loss due to domain wall pinning sites.
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Phillip G. Evans, Phillip G. Evans, Marcelo J. Dapino, Marcelo J. Dapino, "Fully-coupled model for the direct and inverse effects in cubic magnetostrictive materials", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 692922 (2 April 2008); doi: 10.1117/12.776558; https://doi.org/10.1117/12.776558

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