Characterizations of creep-fatigue crack initiation and growth life for P92 using circular notched round bar specimen

R. Sugiura, A. T. Yokobori, T. Nakagawa, T. Adachi, I. Nonaka, M. Tabuchi, Y. Hasegawa, T. Matsuzaki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    A testing method under creep-fatigue interaction conditions has been proposed as the ASTM standard E2714-09. In accordance with the ASTM standard, round bar smooth specimens have been recommended as a testing specimen. Additionally, creep-fatigue crack initiation and growth life are usually defined as the attainment of a specific rate of decrease in the maximum tensile stress or the modulus of elasticity ratios. However, these criterions of crack initiation and growth life on ASTM standard are not characterized in terms of physical crack size. In this study, the creep-fatigue crack initiation and growth tests for P92 were conducted using circular notched round bar specimens. An attempt is made to measure the crack length during the tests by the direct current potential drop method, which results in the establishment of a high accuracy crack length measurement. Additionally, the life of creep-fatigue crack growth was characterized by linear cumulative damage law combined with the Qconcept which has been proposed as fracture parameter to describe the life of creep crack growth.

    Original languageEnglish
    Title of host publicationCreep-Fatigue Interactions
    Subtitle of host publicationTest Methods and Models
    PublisherASTM International
    Pages67-86
    Number of pages20
    ISBN (Print)9780803175259
    Publication statusPublished - 2011 Jan 1
    EventASTM International Symposium on Creep-Fatigue Interactions: Test Methods and Models - San Antonio, TX, United States
    Duration: 2010 Nov 172010 Nov 19

    Publication series

    NameASTM Special Technical Publication
    Volume1539 STP
    ISSN (Print)0066-0558

    Other

    OtherASTM International Symposium on Creep-Fatigue Interactions: Test Methods and Models
    CountryUnited States
    CitySan Antonio, TX
    Period10/11/1710/11/19

    Keywords

    • Circular notched round bar specimen
    • Crack growth life
    • Crack initiation life
    • Creep-fatigue
    • Linear cumulative damage law
    • P92
    • Q* concept

    ASJC Scopus subject areas

    • Materials Science(all)

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