FE validation of R6 elastic-plastic J estimation for circumferentially cracked pipes under mechanical and thermal loadings

Chang Young Oh, Hyun Suk Nam, Yun Jae Kim, Robert A. Ainsworth, Peter J. Budden

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Objective: This paper provides validation of R6 elastic-plastic J-estimation methods, via elastic-plastic finite element analyses for circumferentially cracked pipes under combined mechanical and thermal loads. Materials method: In the FE analyses, the relative magnitudes of the mechanical and thermal loads, types of thermal loads, the crack sizes and material hardening are systematically varied. Loading sequence effects for the mechanical and thermal loads are also considered. The FE elastic-plastic J values are compared with those derived using R6 elastic-plastic J-estimation methods. Results: It is shown that there are significant load order effects on elastic-plastic J for large secondary stress cases, but these are conservatively estimated using newly proposed methods in R6. © 2014 Elsevier Ltd.
    Original languageEnglish
    Pages (from-to)64-79
    Number of pages15
    JournalEngineering Fracture Mechanics
    Volume124-125
    DOIs
    Publication statusPublished - 2014

    Keywords

    • Combined mechanical and thermal loads
    • Elastic-plastic J
    • FE analysis
    • Loading sequence effect
    • V-factor

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