1 May 1996 Measured Terfenol-D material properties under varied applied magnetic field levels
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Abstract
An experimental approach is used to identify Terfenol-D material properties under magnetic bias and mechanical prestress conditions typical of transducer applications for the magnetostrictive material Terfenol-D. The approach is based on low signal transduction models, a mechanical model of the test transducer, and on the theory of vector impedance and admittance analysis. The material properties being investigated, measured directly or calculated from measured quantities, are: two Young's moduli, magnetomechanical coupling factor (or 'figure of merit' of the material), linear coupling coefficient or axial strain coefficient (d33) and two magnetic permeabilities. Electrical impedance and admittance and acceleration per unit current complex functions are measured at frequencies from 100 Hz to 5 kHz using a swept sine excitation at five applied magnetic field levels. Ten Terfenol-D samples are used in randomized performance tests to obtain the preliminary material property information that is presented. Of these ten rods, two were used in randomized performance repeatability tests for which data is also presented. These data sets demonstrate the dependence of material properties on applied magnetic field levels, and provide a preliminary assessment of the variability in material properties given known operating conditions.
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Marcelo J. Dapino, Marcelo J. Dapino, Frederick T. Calkins, Frederick T. Calkins, Alison B. Flatau, Alison B. Flatau, David L. Hall, David L. Hall, } "Measured Terfenol-D material properties under varied applied magnetic field levels", Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); doi: 10.1117/12.239072; https://doi.org/10.1117/12.239072
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