A review of a time-dependent fracture life law (or model) based on a proposed multi-scale analysis

A. Toshimitsu Yokobori, Ryuji Sugiura, Toshihito Ohmi, Robert A. Ainsworth

    Research output: Contribution to journalReview articlepeer-review

    5 Citations (Scopus)

    Abstract

    To solve the problem of structural safety under time-dependent fracture conditions, an algorithm of multi-scale hybrid mechanics from the nano-scale to the macro-scales is described. The paper presents an algorithm that links the physics of materials with life prediction determined by creep crack growth and addresses practical application which enables "prediction of fracture" to be developed from "the science of clarification of fracture mechanism" on the basis of the algorithm. In particular, in order to predict the fracture life of real components, the importance of the link between void mechanics caused by vacancy diffusion (micro mechanical factor), the stress tri-axiality, TF (a structural mechanical factor), and the material structure (a meso-mechanical factor) is shown in the proposed formulation for the activation energy of the thermally activated process of creep crack growth. A detailed discussion on these issues as well as on the algorithm relevant to the establishment of the law of creep crack growth life based on the multi-scale analysis is included ranging from the scale of micro damage to structural brittleness.

    Original languageEnglish
    Pages (from-to)205-218
    Number of pages14
    JournalStrength, Fracture and Complexity
    Volume8
    Issue number4
    DOIs
    Publication statusPublished - 2013 Jan 1

    Keywords

    • Multi-scale
    • Q∗ parameter
    • creep crack growth life
    • material structure
    • stress multi-axiality
    • vacancy diffusion

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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