Mesoscale modelling of crack nucleation from defects in steel

E. Mikkola, G. Marquis (Corresponding Author), Jussi Solin

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    Abstract

    Defects such as pores and non-metallic inclusions have a significant influence on the long-life fatigue strength of high strength steels. The largest of these defects in a critical material volume is in the range of tens of micrometres which is on the same size scale as the grain size. At this scale materials are non-homogeneous since each grain in a polycrystalline material will have a different orientation. Finite element-based mesoscale modelling has been used to model the stress and strain in individual grains in the vicinity of a spherical defect. Microcrack nucleation and propagation models based on shear stress and plastic shear strain have been applied. Especially for low stress amplitudes near the endurance limit, critical grain orientation and defects are both essential for cracks to initiate and propagate.
    Original languageEnglish
    Pages (from-to)64-71
    Number of pages8
    JournalInternational Journal of Fatigue
    Volume41
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed
    EventInternational Symposium on Fatigue Design & Material Defects - Trondheim, Norway
    Duration: 23 May 201125 May 2011

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    Keywords

    • Defects
    • fatigue crack nucleation
    • high strength steel
    • martensitic steel
    • mesoscale modelling

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