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    Numerical Model for the Anisotropic Creep of Zircaloy


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    A model that considers slip to occur on prism planes in hexagonal close packed (hcp) polycrystalline materials is used to determine anisotropic creep rates. The model uses basal pole figures to determine the orientation of individual grains and incorporates certain flow rules to predict creep rates in any direction for any applied stress state. Three combinations of two slip systems, one of which is taken as prism slip, are investigated. A computer code that performs the calculations is described and is used to, determine constants for a phenomenological creep description. The results of this model are compared to available experimental results on the creep of zirconium alloys and are used to study the ovalization of Zircaloy tubes during irradiation.


    zirconium, anisotropy, creep properties, slip, deformation methods

    Author Information:

    Franklin, DG
    Institute for Atom Energy, Halden,

    Franz, WA
    EG & G Idaho, Inc., Idaho Falls, Idaho

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP35581S