STP1245

    Modeling of Damage in Cold Pilgering

    Published: Jan 1994


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    Abstract

    Surface defects may occur in cold pilgering of Zircaloy-4 tubes caused by the stress and strain history. Because the low frequency of these defects makes their direct study difficult, a model has been built to describe the mechanical conditions that prevail during the pass, as a function of tool design, rolling parameters, and friction. It is based upon the geometrical definition of strains that is transformed into stresses via the Von Mises plastic flow rule and a slab method. Rolling forces are deduced and compared with experiments, and the damage function is computed. A number of experimental observations has been performed (axial movements of tube and mandrel, bulge wave propagation, contact length, shearing strains, etc.) that provides the correct hypotheses for the model. A correlation is established between the computed damage function and the frequency and severity of the studied defects.

    Keywords:

    zirconium, zirconium alloys, nuclear materials, nuclear applications, radiation effects, cladding tubes, cold pilgering, mechanical modeling, surface defects, damage (materials)


    Author Information:

    Aubin, JL
    Docteur ingénieur, adjoint au service production, Zircotube, Paimboeuf,

    Girard, E
    Agrégé génie mécanique, I. U. T. de Saint-Nazaire, L. A. M. M., Saint-Nazaire,

    Montmitonnet, P
    Chargé de Recherche, Ecole des Mines de Paris-CEMEF-UA CNRS 1374, Sophia-Antipolis,


    Paper ID: STP15193S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP15193S


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