Magnetomechanical properties of epoxy-bonded Terfenol-D composites

J. Hudson, Simon Busbridge, A.R. Piercy

Research output: Contribution to journalArticle

Abstract

Eddy-current loss is the principal limitation to the use of Terfenol for high frequency applications. Polymer-bonded Terfenol composites, with reduced eddy current loss, aim to complement conventional Terfenol by broadening the useful range of application into the ultrasonic regime. The dependence of the static magnetomechanical properties of the composite material, on the composition parameters of particle size (Ps) and volume fraction of Terfenol (Vf) are investigated as functions of applied field and stress bias. At zero stress bias magnetisation (M) is independent of Ps and directly proportional to V f It is found that magnetostriction (λ) and differential strain coefficient (d) are both independent of V f and Ps, with saturation strains being higher then the values predicted from the simple dilution model. These higher than expected values are explained by particle connectivity within the microstructure. When stress-bias up to 20 MPa is applied to the material, the average increase in saturation strain is 28%. Normalised plots of λ versus M indicate that the magnetisation process within the material consists of both domain wall motion and rotation
Original languageEnglish
Pages (from-to)283-295
Number of pages13
JournalFerroelectrics
Volume228
Issue number1
Publication statusPublished - 1 Jan 1999

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composite materials
eddy currents
saturation
magnetization
magnetostriction
complement
domain wall
dilution
ultrasonics
plots
microstructure
polymers
coefficients

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Hudson, J. ; Busbridge, Simon ; Piercy, A.R. / Magnetomechanical properties of epoxy-bonded Terfenol-D composites. In: Ferroelectrics. 1999 ; Vol. 228, No. 1. pp. 283-295.
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Hudson, J, Busbridge, S & Piercy, AR 1999, 'Magnetomechanical properties of epoxy-bonded Terfenol-D composites', Ferroelectrics, vol. 228, no. 1, pp. 283-295.

Magnetomechanical properties of epoxy-bonded Terfenol-D composites. / Hudson, J.; Busbridge, Simon; Piercy, A.R.

In: Ferroelectrics, Vol. 228, No. 1, 01.01.1999, p. 283-295.

Research output: Contribution to journalArticle

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T1 - Magnetomechanical properties of epoxy-bonded Terfenol-D composites

AU - Hudson, J.

AU - Busbridge, Simon

AU - Piercy, A.R.

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N2 - Eddy-current loss is the principal limitation to the use of Terfenol for high frequency applications. Polymer-bonded Terfenol composites, with reduced eddy current loss, aim to complement conventional Terfenol by broadening the useful range of application into the ultrasonic regime. The dependence of the static magnetomechanical properties of the composite material, on the composition parameters of particle size (Ps) and volume fraction of Terfenol (Vf) are investigated as functions of applied field and stress bias. At zero stress bias magnetisation (M) is independent of Ps and directly proportional to V f It is found that magnetostriction (λ) and differential strain coefficient (d) are both independent of V f and Ps, with saturation strains being higher then the values predicted from the simple dilution model. These higher than expected values are explained by particle connectivity within the microstructure. When stress-bias up to 20 MPa is applied to the material, the average increase in saturation strain is 28%. Normalised plots of λ versus M indicate that the magnetisation process within the material consists of both domain wall motion and rotation

AB - Eddy-current loss is the principal limitation to the use of Terfenol for high frequency applications. Polymer-bonded Terfenol composites, with reduced eddy current loss, aim to complement conventional Terfenol by broadening the useful range of application into the ultrasonic regime. The dependence of the static magnetomechanical properties of the composite material, on the composition parameters of particle size (Ps) and volume fraction of Terfenol (Vf) are investigated as functions of applied field and stress bias. At zero stress bias magnetisation (M) is independent of Ps and directly proportional to V f It is found that magnetostriction (λ) and differential strain coefficient (d) are both independent of V f and Ps, with saturation strains being higher then the values predicted from the simple dilution model. These higher than expected values are explained by particle connectivity within the microstructure. When stress-bias up to 20 MPa is applied to the material, the average increase in saturation strain is 28%. Normalised plots of λ versus M indicate that the magnetisation process within the material consists of both domain wall motion and rotation

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