Mesh sensitivity effects on fatigue crack growth by crack-tip blunting and re-sharpening

Viggo Tvergaard

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Crack-tip blunting under tensile loads and re-sharpening of the crack-tip during unloading is one of the basic mechanisms for fatigue crack growth in ductile metals. Based on an elastic–perfectly plastic material model, crack growth computations have been continued up to 700 full cycles by using remeshing at several stages of the plastic deformation, with studies of the effect of overloads or compressive underloads. Recent published analyses for the first two cycles have shown folding of the crack surface in compression, leading to something that looks like striations. The influence of mesh refinement is used to study the possibility of this type of behaviour within the present method. Even with much refined meshes no indication of crack surface folding is found here.
    Original languageEnglish
    JournalInternational Journal of Solids and Structures
    Volume44
    Issue number6
    Pages (from-to)1891-1899
    ISSN0020-7683
    DOIs
    Publication statusPublished - 2007

    Keywords

    • Crack growth
    • Plasticity
    • Large strains
    • Remeshing
    • Fatigue

    Fingerprint

    Dive into the research topics of 'Mesh sensitivity effects on fatigue crack growth by crack-tip blunting and re-sharpening'. Together they form a unique fingerprint.

    Cite this