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- W2601673815 abstract "For new fast-neutron sodium-cooled Generation IV reactors, the candidate cladding materials for the very strong rates of combustion are the ferritic and martensitic oxide dispersion strengthened (ODS) grades. Classically the cladding tube is cold formed by a sequence of cold pilger rolling passes with intermediate heat treatments. Within the framework of a finite element model, the cold pilgering process is investigated. The numerical model takes into account the complex kinematics of the process as well as the material constitutive behavior under cyclic elastic-plastic loadings. Cyclic behaviour of ODS steels was modeled using an elastic-plastic model developed by Chaboche. A procedure for identifying the model parameters was proposed using an inverse analysis method. This procedure was applied to the experimental cyclic test data of only one specimen, using a sequence of cycles with several strain amplitudes. Moreover, the use of numerical sensors to follow the deformation path of a volume element during the process allows estimating the nature and the amplitude of the cyclic deformations. The identification of the deformation path is the first step toward a better understanding of the critical conditions leading to damage and cracking. The ODS steel is highly textured and mechanically anisotropic. Therefore, the possible influence of this anisotropy on the deformation path is analyzed using (i) an isotropic constitutive law, and (ii) an anisotropic law using the Hill quadratic criterion. Integration of a proper damage law or failure criterion as well as the choice of an appropriated constitutive model into the proposed numerical model leads to the possibility of analyzing conditions for which (a) cracking may develop, and (b) recrystallization may take place upon heat treatment." @default.
- W2601673815 created "2017-04-07" @default.
- W2601673815 creator A5032148978 @default.
- W2601673815 date "2011-12-13" @default.
- W2601673815 modified "2023-09-27" @default.
- W2601673815 title "Numerical modeling of ODS steel tubes pilgering" @default.
- W2601673815 hasPublicationYear "2011" @default.
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