20 April 2007 Magnetomechanical characterization and unified actuator/sensor modeling of ferromagnetic shape memory alloy Ni-Mn-Ga
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Abstract
A unified thermodynamic model is presented which describes the bulk magnetomechanical behavior of singlecrystal ferromagnetic shape memory Ni-Mn-Ga. The model is based on the continuum thermodynamics approach, where the constitutive equations are obtained by restricting the thermodynamic process through the Clausius-Duhem inequality. The total thermodynamic potential consists of magnetic and mechanical energy contributions. The magnetic energy consists of Zeeman, magnetostatic, and anisotropy energy contributions. The microstructure of Ni-Mn-Ga is included in the continuum thermodynamic framework through the internal state variables domain fraction, magnetization rotation angle, and variant volume fraction. The model quantifies the following behaviors: (i) stress and magnetization dependence on strain (sensing effect), and (ii) strain and magnetization dependence on field (actuation effect).
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Neelesh N. Sarawate, Neelesh N. Sarawate, Marcelo J. Dapino, Marcelo J. Dapino, } "Magnetomechanical characterization and unified actuator/sensor modeling of ferromagnetic shape memory alloy Ni-Mn-Ga", Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 652629 (20 April 2007); doi: 10.1117/12.715924; https://doi.org/10.1117/12.715924
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