Effect of the Loading Rate on the Brittle Fracture of Terfenol-D Specimens in Magnetic Field: Strain Energy Density Approach

M. Colussi, F. Berto, K. Mori, Fumio Narita

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The aim of the present study is to characterize the fracture behavior of the giant magnetostrictive Terfenol-D alloy, both experimentally and numerically. Three-point bending tests have been carried out on single-edge precracked specimens, and fracture loads have been measured at different loading rates, in the presence or absence of a magnetic field. In recent years, it has been shown that the strain energy density (SED), averaged in a finite control volume, can successfully predict brittle failures of cracked, U- and V-notched specimens made of several materials. By performing coupled-field finite element analyses, the effects of the magnetic field and he loading rate on Terfenol-D failures have been analyzed, and the capability of SED criterion to capture these effects has been discussed. A relationship between the SED control volume size and the loading rate has been proposed, and failures have been quite accurately predicted in terms of the averaged SED.

Original languageEnglish
Pages (from-to)791-800
Number of pages10
JournalStrength of Materials
Volume48
Issue number6
DOIs
Publication statusPublished - 2016 Nov 1

Keywords

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

ASJC Scopus subject areas

  • Mechanics of Materials

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