Use of abrupt strain path change for determining subsequent yield surface: Illustrations of basic idea

Mitsutoshi Kuroda, Viggo Tvergaard

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    For elastic-plastic materials, a new method is proposed for determining the shape of the subsequent yield surface in the Vicinity of a current loading point. A proportional strain path is prescribed until the loading point of interest has been reached, then an abrupt strain path change is prescribed, which makes the stress point move quickly along the yield surface. It is assumed that a closed-loop testing machine is used for the experiment, so that the strain path can be prescribed according to strain gauge measurements. Relative to the standard method of determining yield surface shapes by probing in many different stress directions from the elastic region, using some chosen plastic strain offset, the main advantage of the proposed method is that elastic unloading is not needed prior to tracing the yield surface. The method is illustrated here by a few analyses, first for the simplest how theory of plasticity, and subsequently for crystal plasticity, using the Taylor model to represent a polycrystal. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalActa Materialia
    Volume47
    Pages (from-to)3879-3890
    DOIs
    Publication statusPublished - 1999

    Keywords

    • Metals
    • Yield phenomena
    • Constitutive equations
    • Experimental method

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