The correlation between mechanical properties and electric current under thermal shock for YBa2Cu3Ox superconductors

A. Toshimitsu Yokobori, Tsukasa Kobayashi, Keizo Hashimoto, Kamel Salama

    Research output: Contribution to journalArticlepeer-review

    Abstract

    High temperature YBa2Cu3Ox- (123, YBCO) superconductors have been shown to possess high current carrying capability which is confined to currents flowing along the strongly super-conducting a-b planes within a single oriented domain. Usually, in this material, thermal cycling occurs in the temperature region ranging from -196°C (liquid nitrogen) under actual operation to room temperature under out of operation for maintenance. Micro-cracks are considered to initiate during these thermal cycles which result in the high electric resistance. Therefore, the existence of micro-cracks is considered to be a dominant factor in decreasing J c. In this study, an apparatus for thermal cycling has been designed and built to provide thermal cycles ranging from -196°C to room temperature. To clarify the time sequential deterioration on the mechanical properties of YBCO due to thermal cycles, a sharp notched RCT specimen with 20° of notch tip angle and 0.02 mm of notch tip radius was designed. By using this specimen, the time sequential deterioration of stiffness, dP/dδ and fracture toughness of YBCO for a sharp notched RCT specimen due to thermal cycles were investigated. The results show a correlation between these mechanical properties and previously obtained the super-conducting properties of this material. Thermal cycling causes the deterioration of mechanical properties which results in the deterioration of critical current density.

    Original languageEnglish
    Pages (from-to)11-19
    Number of pages9
    JournalStrength, Fracture and Complexity
    Volume2
    Issue number1
    Publication statusPublished - 2004 Nov 16

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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