Tensile Strength and Fracture Toughness of YBCO Superconductor and Resistivity during Fracture Test

Yutaka Watanabe, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

Abstract

Tensile strength of sintered YBCO superconductor at 77K was evaluated by Brazilian test and fracture toughness at 85K was measured by use of round compact tention specimen. Superconductivity of specimens during Brazilian tests were examined by the four-point terminal method. Density of a specimen was the principal factor of tensile strength and the fracture surface exhibited the cleavage-intergranular mixed pattern. No change in superconductivity of specimens was observed until mechanical fracture occurred. Namely, no stress dependence on superconductivity was observed for these material tested. Fracture toughness Ko of sintered YBCO was also measured by use of a round compact specimen. The Ko value of sintered YBCO with a density of 4.84g/cm3 was l.lMPa-m1/2. The obtained Ko shows the value of one third or quarter compared with that of ordinary ceramics (Zr02, AI2O3).

Original languageEnglish
Pages (from-to)843-846
Number of pages4
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Volume55
Issue number512
DOIs
Publication statusPublished - 1989

Keywords

  • Ceramic Superconductor
  • Fracture Toughness
  • Quench Phenomenon
  • Strength
  • Stress Effect
  • Superconductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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