Research Article Open Access

Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field

Marco Colussi1, Filippo Berto2, Kotaro Mori3 and Fumio Narita4
  • 1 University of Padua, Italy
  • 2 NTNU, Norway
  • 3 Ibaraki University, Japan
  • 4 Tohoku University, Japan
American Journal of Engineering and Applied Sciences
Volume 9 No. 4, 2016, 1239-1246

DOI: https://doi.org/10.3844/ajeassp.2016.1239.1246

Published On: 28 December 2016

How to Cite: Colussi, M., Berto, F., Mori, K. & Narita, F. (2016). Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field. American Journal of Engineering and Applied Sciences, 9(4), 1239-1246. https://doi.org/10.3844/ajeassp.2016.1239.1246

Abstract

The following investigation has the purpose of describing, both experimentally and numerically, the fracture behavior of a giant magnetostrictive alloy commercially known as Terfenol-D. Single-edge precracked specimens have been analyzed via three-point bending tests, measuring fracture loads in the presence and absence of a magnetic field at various loading rates. The Strain Energy Density (SED), averaged in a finite control volume, has recently proved to be an excellent method of predicting brittle failures of cracked, U- and V-notched specimens made out of different materials. The effects of the magnetic field and of the loading rate on Terfenol-D failures have been studied, as well as discussing the ability of SED criterion to seize these effects, by performing coupled-field finite element analyses. Finally, a relationship between the size of the SED's control volume and the loading rate has been proposed and failures have then been estimated in terms of averaged SED.

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Keywords

  • Terfenol-D
  • Strain Energy Density
  • Magnetostriction
  • Fracture