Scale effects of specimens on the creep crack initiation (incubation state of creep crack growth)

A. Toshimitsu Yokobori, Ryuji Sugiura, Hideo Tomizawa, Hiroshi Sakata

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The definition of the incubation time of creep crack growth has been discussed from the view points of scale effects of specimens. The crack length corresponding to the stage of creep deformation was found to be sensitive to the scale effects of specimens. Therefore, crack length at the early stage of creep deformation such as transient creep is different depending on specimen size. These results were assured by in situ observational and electrical potential methods. Based on these results, it was found to be reasonable to relate the definition of the incubation time of creep crack growth to the stage of creep deformation which concerns creep damage composed of micro cracks.

    Original languageEnglish
    Pages (from-to)133-141
    Number of pages9
    JournalStrength, Fracture and Complexity
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - 2009 Dec 1

    Keywords

    • Creep crack growth
    • Creep crack initiation
    • Creep damage
    • Incubation time
    • Micro-crack
    • RNOD

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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