Nonlinear kinematic hardening under non-proportional loading

N.S. Ottosen

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    Abstract

    Nithin the framework of conventional plasticity theory, it is first determined under which conditions Helan-Prager's and Ziegler's kinematic hardening rules result in identical material behaviour. Next, assuming initial isotropy and adopting the von Mises yield criterion, a nonlinear kinematic hardening function
    is proposed for prediction of metal behaviour. The model assumes that hardening at a specific stress point depends on the direction of the new incremental loading. Hereby a realistic response is obtained for general reversed loading, and a smooth behaviour is assured, even when loading deviates more and more from proportional loading and ultimately results in reversed loading. The predictions of the proposed model for non-proportional loading under plane stress conditions are compared with those of the classical linear kinematic model, the isotropic model and with published experimental data. Finally, the limitations of the proposed model are discussed.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages22
    ISBN (Print)87-550-0611-6
    Publication statusPublished - 1979
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number408
    ISSN0106-2840

    Keywords

    • Risø-R-408

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