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

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

    研究成果: Article査読

    抄録

    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.

    本文言語English
    ページ(範囲)11-19
    ページ数9
    ジャーナルStrength, Fracture and Complexity
    2
    1
    出版ステータスPublished - 2004 11 16

    ASJC Scopus subject areas

    • 凝縮系物理学
    • 材料力学
    • 機械工学

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