Abstract
The dependence of the dynamic magneto-mechanical properties of epoxy-bonded Terfenol on the composition parameters of particle size ( P s) and volume fraction of Terfenol ( V f) is investigated as functions of bias field ( H) and high frequency ( f). Samples were prepared with powder in five size ranges between 106 and 710 μm using three volume fractions. The dynamic strain coefficient ( d) and magneto-mechanical coupling coefficient ( k) were found to be independent of P s and V f while the dynamic relative permeability ( μ r) was proportional to V f. d showed less variation with H up to 100 kA m −1, than for bulk Terfenol with d also exhibiting a flat response with frequency, up to 20 kHz. The frequency dependence of μ r, up to 200 kHz, was also flat apart from the occurrence, at ∼15 kHz, of a fundamental shape resonance which was also experienced by d. Classical eddy current theory was used to model the behaviour of μ r with f and it was found that experiment and theory were qualitatively similar.
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