The master curve method: A new concept for brittle fracture

Kim Wallin

    Research output: Contribution to journalArticleScientificpeer-review

    78 Citations (Scopus)

    Abstract

    The term fracture toughness usually refers to the linear elastic fracture resistance parameter KIC. In the case of structural steels. The estimation of KIC is limited to the lower shelf of toughness or requires extremely large specimens. This specimen size requirement has been one major obstacle for applying fracture mechanics in structural integrity assessment outside aviation, nuclear and off-shore industries. During the last decade, a statistical data treatment methodology, based on a micro-mechanistic cleavage fracture model, combined with elastic plastic finite element analysis has enabled the fracture toughness to be characterised with small specimens in Ihe ductile to brittle transition region. The development has led to a new testing standard for fracture toughness testing of ferritic steels in the transition range (ASTM E1921-97). Here, the premises for the methodology are described and its validity range is discussed. Presently the methodology has been validated for as small as 10 x 10 mm² bend specimens, but the use of even smaller specimens is under investigation.
    Original languageEnglish
    Pages (from-to)342-354
    Number of pages13
    JournalInternational Journal of Materials and Product Technology
    Volume14
    Issue number2/3/4
    DOIs
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Brittle fracture
    Fracture toughness
    Ferritic steel
    Testing
    Structural integrity
    Fracture mechanics
    Aviation
    Toughness
    Plastics
    Finite element method
    Steel
    Industry

    Cite this

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    title = "The master curve method: A new concept for brittle fracture",
    abstract = "The term fracture toughness usually refers to the linear elastic fracture resistance parameter KIC. In the case of structural steels. The estimation of KIC is limited to the lower shelf of toughness or requires extremely large specimens. This specimen size requirement has been one major obstacle for applying fracture mechanics in structural integrity assessment outside aviation, nuclear and off-shore industries. During the last decade, a statistical data treatment methodology, based on a micro-mechanistic cleavage fracture model, combined with elastic plastic finite element analysis has enabled the fracture toughness to be characterised with small specimens in Ihe ductile to brittle transition region. The development has led to a new testing standard for fracture toughness testing of ferritic steels in the transition range (ASTM E1921-97). Here, the premises for the methodology are described and its validity range is discussed. Presently the methodology has been validated for as small as 10 x 10 mm² bend specimens, but the use of even smaller specimens is under investigation.",
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    The master curve method : A new concept for brittle fracture. / Wallin, Kim.

    In: International Journal of Materials and Product Technology, Vol. 14, No. 2/3/4, 1999, p. 342-354.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - The master curve method

    T2 - A new concept for brittle fracture

    AU - Wallin, Kim

    N1 - Project code: V7SU00063

    PY - 1999

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    AB - The term fracture toughness usually refers to the linear elastic fracture resistance parameter KIC. In the case of structural steels. The estimation of KIC is limited to the lower shelf of toughness or requires extremely large specimens. This specimen size requirement has been one major obstacle for applying fracture mechanics in structural integrity assessment outside aviation, nuclear and off-shore industries. During the last decade, a statistical data treatment methodology, based on a micro-mechanistic cleavage fracture model, combined with elastic plastic finite element analysis has enabled the fracture toughness to be characterised with small specimens in Ihe ductile to brittle transition region. The development has led to a new testing standard for fracture toughness testing of ferritic steels in the transition range (ASTM E1921-97). Here, the premises for the methodology are described and its validity range is discussed. Presently the methodology has been validated for as small as 10 x 10 mm² bend specimens, but the use of even smaller specimens is under investigation.

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