Fully-coupled model for the direct and inverse effects in cubic magnetostrictive materials

Phillip G. Evans; Marcelo J. Dapino

doi:10.1117/12.776558

2 April 2008 Fully-coupled model for the direct and inverse effects in cubic magnetostrictive materials

Phillip G. Evans, Marcelo J. Dapino

Proceedings Volume 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008; 692922 (2008) https://doi.org/10.1117/12.776558
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

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 (Fe_1-xGa_x) 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.

Citation Download Citation

Phillip G. Evans and 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); https://doi.org/10.1117/12.776558

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