Fracture toughness of Sm123 bulk superconductors evaluated by tensile and bending tests

Kazumune Katagiri, Akira Murakami, Taichi Okudera, Yasuhiro Yoshino, Akira Iwabuchi, Koshichi Noto, Naomichi Sakai, Masato Murakami

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Abstract

The effects of test temperature and Sm211 (2BaCuO5) secondary phase particles on the fracture toughness of the Sm123 (SmBa 2Cu3Ox) single grain bulk superconductors were investigated by tensile and bending tests using the V-notched specimens. The correlation between the obtained fracture toughness by tensile and bending test was not necessarily good. The fracture toughness obtained by the indentation method was lower than them. The tensile fracture toughness for the crack propagation in the c-axis, 1.2-1.3 MPa m1/2, was higher than that in the direction perpendicular to the c-axis, 1.0-1.1 MPa m1/2. Although the former increased with increase in the Sm211 molar fraction, the latter did not increase. There was no appreciable difference between the fracture toughness obtained by the tensile tests at LNT and that at RT, while the fracture toughness from the indentation method at LNT was slightly lower than that at RT.

Original languageEnglish
Pages (from-to)1046-1049
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume14
Issue number2
DOIs
Publication statusPublished - 2004 Jun 1

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Keywords

  • Bending test
  • Cryogenic temperature
  • Sm123 bulk superconductor
  • Tensile test

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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