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

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

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)345-360
    Number of pages16
    JournalEngineering Fracture Mechanics
    Volume28
    Issue number3
    DOIs
    Publication statusPublished - 1987

    ASJC Scopus subject areas

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

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