SEDL / STP / STP1467-EB / STP37526S

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

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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.