Quantitative estimation of the effect of stress rising, holding and descending time on fatigue crack growth rate under corrosion environment

Toshimitsu Yokobori, Noboru Chiba, Tetsuya Yamada, Tomokazu Kosumi, Takeo Yokobori

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    The corrosion fatigue tests were carried out for Cr-Mo steel (SCM440) by varying the stress rising time (tR), holding time (tH) and descending time (tD). In the present paper, for the case of symmetrical stress wave (tR=tH), the constitutive equation of corrosion fatigue crack growth rate, da/dN|CF, was derived explicitly in terms of tR and tH. The experimental results of corrosion fatigue crack growth rate under various stress rising and holding time conditions were found to be well expressed. The equation does not satisfy the critical condition. A more satisfied constitutive equation was derived. From this equation, it can be found that the corrosion fatigue crack growth rate is affected by the time dependent effect and the fatigue effect under the symmetrical stress wave condition. The mechanism of the tR process is controlled by the fatigue effect coupled with the time dependent effect controlling the tR process, while the tD process is controlled mainly by the time dependent effect although it includes some fatigue effect.

    Original languageEnglish
    Pages (from-to)945-950
    Number of pages6
    JournalZairyo/Journal of the Society of Materials Science, Japan
    Volume37
    Issue number419
    Publication statusPublished - 1988 Aug

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Metals and Alloys
    • Polymers and Plastics

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