Coupled fracture criterion and prefracture zone during out-of-plane shear

Vladimir Kurguzov, Vladimir Kornev

    Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

    Abstract

    The initiation of a longitudinal shear crack (mode III fracture) in homogeneous structures and weld joints of elastoplastic materials with the limiting strain is considered. To obtain critical fracture parameters, a coupled (sufficient) fracture criterion in an elastoplastic material is used. Simple relations for critical shear stresses, lengths of pre-fracture zones and critical stress intensity factor (SIF) for mode III fracture were obtained. There is a limiting transition from a sufficient fracture criterion to the necessary criterion, when the length of the prefracture zone tends to zero. Critical stresses obtained according to necessary and sufficient criteria differ significantly. In the framework of the proposed model, the critical SIF obtained by a sufficient criterion is a variable, it depends on the grain diameter, the parameters of the material strain diagram and the crack length. The rule of selection of the parameters of the proposed fracture model is indicated by two laboratory experiments: by approximating the material strain diagram with a simple shear and critical SIF. The obtained critical parameters are conservative estimates of critical stresses. These estimates should be used in the calculation of steel structures operating at temperatures below the cold brittleness.

    Original languageEnglish
    Title of host publication28th Russian Conference on Mathematical Modelling in Natural Sciences
    EditorsValeriy P. Matveenko, Peter V. Trusov, Anton Yu Yants, Vladimir A. Faerman
    PublisherAmerican Institute of Physics Inc.
    Number of pages8
    ISBN (Electronic)9780735419704
    DOIs
    Publication statusPublished - 1 Apr 2020
    Event28th Russian Conference on Mathematical Modelling in Natural Sciences, RuMoNaS 2019 - Perm, Russian Federation
    Duration: 2 Oct 20195 Oct 2019

    Publication series

    NameAIP Conference Proceedings
    Volume2216
    ISSN (Print)0094-243X
    ISSN (Electronic)1551-7616

    Conference

    Conference28th Russian Conference on Mathematical Modelling in Natural Sciences, RuMoNaS 2019
    CountryRussian Federation
    CityPerm
    Period02.10.201905.10.2019

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