Abstract
A magnetoelastic constitutive theory of nonlinear anhysteretic behaviors based on domain rotation is presented in this paper for giant magnetostrictive materials (GMMs). For a Tb-Dy-Fe polycrystal with preferred orientations, the magnetic moments of domains are constrained by the anisotropy to lie along the easy magnetization directions. Thus, the fractional occupancies of only the eight directions and the field direction are calculated using an in verse exponential distribution function for simplicity. The linear fitting of the potential distribution parameter with the pre-stress i s obtained from the magnetization curves under different compressive stresses for a (110) oriented Tb-Dy-Fe rod, which is used to predict the magnetostriction behaviors. It shows good quantitative agreement with the experimental results under a range of constant uniaxial compressive stresses.
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