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    Volume 3, Issue 2 (September 2014)

    Special Issue Paper

    Creep-Fatigue Interaction Models for Grade 91 Steel

    (Received 30 September 2013; accepted 9 January 2014)

    Published Online: 20 September 2014


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    Different approaches for modelling creep–fatigue (CF) interaction are used on strain controlled creep fatigue data of 9Cr–1Mo-VNb (P91) steel and assessed with the target of finding suitable candidates for use in design rules. The assessed models include time, ductility, and strain energy-based creep-fatigue interaction methods and two simplified models. For the interaction diagram-based models, the challenge of acquiring representative creep damage fractions from the dynamic material response, i.e., cyclic softening with changing relaxation behaviour is addressed. In addition, the interaction diagram approaches are discussed in the light of known (fatigue) material scatter and defining representative cycles for CF data. The performance of the model are presented and also compared against the RCC–MR design code methodology. It is shown that the fitting accuracy of the complex interaction models vary significantly and that modified ductility based models seem to be less susceptible to changes in supporting creep and relaxation models. Successful and also superior prediction of the CF number of cycles to failure for Grade 91 steel was accomplished by simplified methods with much less fitting parameters. The practicality in using interaction diagram methods for design purposes, where simplicity is a key issue, is questioned.

    Author Information:

    Holmström, Stefan
    European Commission, Joint Research Centre – IET, Petten,

    Pohja, Rami
    VTT Technical Research Centre of Finland, Espoo,

    Payten, Warwick
    Ansto, Australian Nuclear Science and Technology Organization, Kirrawee,

    Stock #: MPC20130054


    DOI: 10.1520/MPC20130054

    Title Creep-Fatigue Interaction Models for Grade 91 Steel
    Symposium ,
    Committee E08