Strain Energy Density Based Assessment of Cracked Terfenol-D Specimens under Magnetic Field and Different Loading Rates

Marco Colussi, Filippo Berto, Kotaro Mori, Fumio Narita

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The purpose of this work is the characterization of the fracture behaviour of giant magnetostrictive materials subjected to a magnetic field. Both experimental and numerical investigations have been performed, focusing on iron and rare earth alloys, such as the commercially named Terfenol-D. Tests have been carried out on single-edge precracked specimens subjected to three-point bending in the presence and absence of a magnetic field and fracture loads have been measured at different loading rates. Recent studies on local stress fields in proximity of crack and notch tips have shown that Strain Energy Density (SED), averaged in a circular control volume which includes a crack tip, could be a robust parameter in the assessment of brittle fracture resistance of several materials. Coupled-field analyses have then been performed on both plane stress and plane strain finite element models and the effect of the magnetic field on fracture resistance of Terfenol-D alloy was predicted in terms of averaged SED. A relationship between the SED's control volume size and the loading rate has also been proposed.

Original languageEnglish
Pages (from-to)1837-1844
Number of pages8
JournalProcedia Structural Integrity
Volume2
DOIs
Publication statusPublished - 2016

Keywords

  • fracture toughness
  • giant magnetostrictive materials
  • magnetic field
  • smart materials
  • strain energy density
  • strain energy release rate

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

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