High-temperature creep rupture of low alloy ferritic steel butt-welded pipes subjected to combined internal pressure and end loadings

F Vakili-Tahami, David Hayhurst, M Wong

    Research output: Contribution to journalArticlepeer-review

    255 Downloads (Pure)

    Abstract

    Constitutive equations are reviewed and presented for low alloy ferritic steels which undergo creep deformation and damage at high temperatures; and, a thermodynamic framework is provided for the deformation rate potentials used in the equations. Finite element continuum damage mechanics studies have been carried out using these constitutive equations on butt-welded low alloy ferritic steel pipes subjected to combined internal pressure and axial loads at 590 and 620°C. Two dominant modes of failure have been identified: firstly, fusion boundary failure at high stresses; and, secondly, Type IV failure at low stresses. The stress level at which the switch in failure mechanism takes place has been found to be associated with the relative creep resistance and lifetimes, over a wide range of uniaxial stresses, for parent, heat affected zone, Type IV and weld materials. The equi-biaxial stress loading condition (mean diameter stress equal to the axial stress) has been confirmed to be the worst loading condition. For this condition, simple design formulae are proposed for both 590 and 620°C. © 2005 The Royal Society.
    Original languageEnglish
    Pages (from-to)2629-2661
    Number of pages32
    JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
    Volume363
    DOIs
    Publication statusPublished - 15 Nov 2005

    Keywords

    • CDM
    • Creep rupture
    • High-temperature
    • Welds

    Fingerprint

    Dive into the research topics of 'High-temperature creep rupture of low alloy ferritic steel butt-welded pipes subjected to combined internal pressure and end loadings'. Together they form a unique fingerprint.

    Cite this