Stress-holding time effects on creep-fracture cracking in a notched specimen

Kikuchi Kenji, Yokobori Toshimitsu, Futakawa Masatoshi, Muto Yasushi, Yokobori Takeo

    研究成果: Article査読

    抄録

    The cracking behavior of Ni-based heat-resisting alloy was investigated in a vacuum environment at 1073 K using the double-edged notch specimens, with varying the stress-holding time Th and the stress-rising time Tr during the cycle. The results showed that the crack initiation was only time-dependent regardless of Tr and Th. The stress-rising time in the creep-fatigue mode had only a pausing effect against the creep damage because the crack initiation time in the fatigue mode was much longer than that in the creep mode. Although the crack growth was also time-dependent in the fatigue mode of Tr ≧ 6 s, it was rather cyclic-dependent in the fatigue mode of Tr = 1 s. As long as the crack initiation or growth is only time-dependent, the life of the crack initiation or growth can be evaluated by a single parameter of Th/Tr, in the trapezoidal load wave.

    本文言語English
    ページ(範囲)345-360
    ページ数16
    ジャーナルEngineering Fracture Mechanics
    28
    3
    DOI
    出版ステータスPublished - 1987

    ASJC Scopus subject areas

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

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