Effect of hoop-stress on torque sensing using inverse magnetostriction of FeGaAlZrC alloy ring

Munekatsu Shimada, Takeo Chinen, Kazuyuki Kumabayashi, Masanori Yokoyama, Teiko Okazaki, Yasubumi Furuya

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Galfenol (FeGaAlZrC) alloy ring was used for torque-sensing by detecting a leakage flux from the ring surface based on the inverse magnetostriction effect. This leakage flux changes depending on the magnetic parameter such as magnetostrictive strain (λ), residual magnetization (Mr), applied or residual stresses (σ) of the ring. Beside, the hoop stress (σh) which is one of the residual stress factor in the ring also has strong effect on torque-sensing because this affects those magnetic parameters. The fitting gap between ring and shaft was four kinds of 6,10,20 and 30 μm and hoop stress (σh) in each case can be estimated from the elastic formula of material-mechanics. As a result, torque sensitivity showed the maximum value in the case of 10 micrometers gap and it decreased toward the gaps of 10 and 20 μm and drastically decreased in the case of minimum gap of 6 μm. This change of torque sensitivity depending fitting gap is discussed based on the magnetic domain mobility and inelastic material effect at the interface of Galfenol ring and rotating shaft.

Original languageEnglish
Pages (from-to)540-542
Number of pages3
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number8
Publication statusPublished - 2010 Aug


  • Galfenol
  • Hoop stress
  • Inverse magnetostriction effect
  • Iron-gallium alloy
  • Leakage magnetic flux
  • Smart materials
  • Torque sensor

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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