Cleavage modelling with experimental particle size distribution and novel particle failure criterion

Andrey P. Jivkov, Peter James

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    Abstract

    Most of the existing local approaches for cleavage fracture derive from the assumptions that global failure is a weakest-link event and that only the tail of the size distribution of micro-crack initiating features is significant. This appears to be sufficient in predicting lower shelf toughness under high constraint conditions, but may fail when attempting to predict toughness in the transition region or for low constraint conditions when using the same parameters. While coupled ductile damage models with Beremin-like failure probability could be useful in the transition region, uncoupled models with "a posteriori" probability calculations are advantageous to the engineering community. Cleavage toughness predictions in the transition regime, which can be extended to low constraint conditions, are here made with improved criterion for particle failure and experimentally based size distribution of initiators for specific RPV steel. The model is shown to predict experimentally measured locations of cleavage initiators. Further, the model predicts the fracture toughness in a large part of the transition region and accurately predicts a measured shift with irradiation. All results are obtained without changes in model parameters. This suggests that the model can be used for assessing toughness changes due to constraint- And temperature-driven plasticity changes. Copyright © (2013) by International Conference on Fracture.
    Original languageEnglish
    Title of host publication13th International Conference on Fracture 2013, ICF 2013|Int. Conf. Fract., ICF
    Place of PublicationBeijing
    PublisherChinese Society of Theoretical and Applied Mechanics
    Pages5591-5600
    Number of pages9
    Volume7
    Publication statusPublished - 2013
    Event13th International Conference on Fracture 2013, ICF 2013 - Beijing, China
    Duration: 16 Jun 201321 Jun 2013

    Conference

    Conference13th International Conference on Fracture 2013, ICF 2013
    Country/TerritoryChina
    CityBeijing
    Period16/06/1321/06/13

    Keywords

    • Global failure probability
    • Local failure criterion
    • RPV steel
    • Transition temperature regime

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