Fracture toughness evaluation of YBCO bulk superconductor

T. Okudera, A. Murakami, K. Katagiri, K. Kasaba, Y. Shoji, K. Noto, Naomichi Sakai, Masato Murakami

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Evaluation of the fracture toughness of a Y-Ba-Cu-O bulk superconductor with 28.6 mol% Y-211 and 15 wt.% Ag has been investigated by tensile tests at room temperature using specimens with a sharp V-notch. The notch was introduced into the specimens such that its direction of depth was parallel or perpendicular to the c-axis and the loading direction was in the a(b)-axis. Fracture toughness evaluation by three-point bending tests was also carried out. In addition, usual tensile tests and three-point bending tests were also carried out in the specimens without V-notch. The scatter of measured fracture toughness values by the bending tests, 1.6-2.1 MPa m1/2, was less as compared with that by the tensile tests, 1.1-2.5 MPa m1/2. However, the average value in tensile tests 1.9 MPa m1/2 coincided with that in bending tests. The maximum and the average value of bending strength, 109 and 104 MPa, were higher than those of tensile strength, 72 and 56 MPa, respectively.

Original languageEnglish
Pages (from-to)628-633
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Issue numberPART 1
Publication statusPublished - 2003 Oct
Externally publishedYes



  • Bending test
  • Fracture toughness
  • Tensile test
  • Y-Ba-Cu-O bulk

ASJC Scopus subject areas

  • Condensed Matter Physics

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