Mixed mode fracture behavior of notched giant magnetostrictive: Mechanical characterization and comparison among failure criteria

Mirco Peron, Kenichi Katabira, Luigi Mario Viespoli, Fumio Narita, Filippo Berto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The mechanical properties of Terfenol-D, a giant magnetostrictive material used in applications such as actuators and sensors, have been barely studied, in particular in the presence of notches. Thus, the aim of this work is to fill this gap present in literature. Three point bending tests have been carried out on U-notched specimens with a notch radius of 0.15 mm. The load has been applied at different distances from the midpoint in order to obtain different combinations of mode I and mode II, with the fraction of mode I always being predominant. The results show that higher contributions of the mode II lead to higher fracture loads. In addition, the data experimentally obtained have then been compared with the predictions provided by three different failure criteria, i.e. the strain energy density (SED) approach, the U-maximum tangential stress (UMTS) criterion and the theory of critical distances (TCD) method. Finally, the fracture initiation angles obtained experimentally have been compared with those proposed by the three approaches, and their weaknesses and strengths have been reported.

Original languageEnglish
Pages (from-to)194-204
Number of pages11
JournalTheoretical and Applied Fracture Mechanics
Volume99
DOIs
Publication statusPublished - 2019 Feb

Keywords

  • Magnetostrictive material
  • Mixed mode fracture
  • Point method
  • SED
  • Strain energy density approach
  • TCD
  • Terfenol-D
  • UMTS

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

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