STP1467: Identification of Crystalline Behavior on Macroscopic Response and Local Strain Field Analysis: Application to Alpha Zirconium Alloys

    Gélébart, L
    Research Engineer, CEA Saclay /DEN/DMN/SRMA,

    Crépin, J
    Research Engineer, LMS Ecole Polytechnique,

    Dexet, M
    Ph.D. Student, CEA Saclay /DEN/DMN/SRMA,

    Sauzay, M
    Research Engineer, CEA Saclay /DEN/DMN/SRMA,

    Roos, A
    Research Engineer, ONERA,

    Pages: 19    Published: Jan 2005


    Abstract

    The purpose of this paper is to present an identification method of the crystalline behavior of a material from a mechanical test performed on a polycrystalline sample. Because of the lack of knowledge about its crystalline behavior, this method is applied to a Zirconium alloy. This identification is based on a finite element modeling of the microstructure, and the results are compared to both the macroscopic and the microscopic experimental results. On the microscopic scale, the plastic strains are obtained using a micro-extensometry technique and the crystalline orientation using an EBSD technique. In order to validate the method, an identification is performed with only two free parameters: the evolutions of the macroscopic and microscopic errors appear to be regular and exhibit a well-defined minimum so that the parameters can be clearly identified.

    Keywords:

    identification, crystalline plasticity, zirconium, finite-element, micro-extensometry, EBSD


    Paper ID: STP37526S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP37526S


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