Fracture toughness of SmBaCuO bulk superconductors at cryogenic temperatures

Yasuhiro Yoshino, Akira Iwabuchi, Naoki Takahashi, Kazumune Katagiri, Koshichi Noto, Naomichi Sakai, Masato Murakami

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Fracture toughness of Sm123 bulk superconductors with 16.7 and 28.6 mol% of Sm211 particles have been investigated by Vickers hardness test at cryogenic temperatures. The hardness test was carried out on (001) plane for two types of SmBCO bulk materials during 40-293 K. The hardness of Sm17 became constant to 5,000 MPa during 40-293 K. However, the hardness of Sm29 increased to 7,380 MPa with decreasing temperatures. In addition, fracture toughness of Sm17 and Sm29 will be discussed calculating from Vickers hardness, Median crack length, Young's modulus and applied load. The fracture toughness of Sm17 became constant to 0.8 MPa√m following the hardness property. The fracture toughness of Sm29 decreased from 0.73 MPa√m at 293 K to 0.67 MPa√m at 40 K.

Original languageEnglish
Pages (from-to)1118-1121
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - 2004 Jun
Externally publishedYes


  • Cryogenic temperatures
  • Deformation mechanism
  • Fracture toughness
  • Vickers hardness

ASJC Scopus subject areas

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


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