Effective magnetostriction and magnetomechanical coupling of terfenol-D composites

Guo, Z. J.; Busbridge, S. C.; Piercy, A. R.; Zhang, Z. D.; Zhao, X. G.; Wang, B. W.
May 2001
Applied Physics Letters;5/28/2001, Vol. 78 Issue 22, p3490
Academic Journal
Epoxy and glass matrix Terfenol-D composites have been produced by using a cold and hot compression-molding technique, respectively. The static and dynamic magnetic and magnetomechanical properties of samples with a volume fraction V[sub f] in the range of 10% to 82% have been investigated as functions of bias field, frequency, and ac drive field. The epoxy composites have a greater saturation magnetostrain than the glass composite with the same V[sub f]. The elastic modulus of the epoxy composites is dominated by that of the matrix, E[sub m]. Increasing the value of E[sub m] reduces the measured magnetostriction λ[sub c] of the composites. A model, based on the strain related energy equilibrium, has been developed to describe the experimental results for V[sub f] and E[sub m] dependences of λ[sub c] and the magnetomechanical coupling coefficient k[sub 33]. It is concluded that an optimum k[sub 33] value can be obtained by choosing a matrix with an appropriate elastic modulus. © 2001 American Institute of Physics.


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