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

Vladimir Kurguzov, Vladimir Kornev

    Результат исследования: Публикации в книгах, отчётах, сборниках, трудах конференцийстатья в сборнике материалов конференциинаучнаярецензирование

    Аннотация

    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.

    Язык оригиналаанглийский
    Название основной публикации28th Russian Conference on Mathematical Modelling in Natural Sciences
    РедакторыValeriy P. Matveenko, Peter V. Trusov, Anton Yu Yants, Vladimir A. Faerman
    ИздательAmerican Institute of Physics Inc.
    Число страниц8
    ISBN (электронное издание)9780735419704
    DOI
    СостояниеОпубликовано - 1 апр 2020
    Событие28th Russian Conference on Mathematical Modelling in Natural Sciences, RuMoNaS 2019 - Perm, Российская Федерация
    Продолжительность: 2 окт 20195 окт 2019

    Серия публикаций

    НазваниеAIP Conference Proceedings
    Том2216
    ISSN (печатное издание)0094-243X
    ISSN (электронное издание)1551-7616

    Конференция

    Конференция28th Russian Conference on Mathematical Modelling in Natural Sciences, RuMoNaS 2019
    СтранаРоссийская Федерация
    ГородPerm
    Период02.10.201905.10.2019

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