Assessment of elasto-viscoplasticity mean-field homogenization rules applied to FCC polycrystals

International audienceNumerical approaches have been extensively developed to predict the mechanical behavior ofpolycrystalline metals and alloys. In particular, micro-mechanical approaches have been usedto take into account the physical mechanisms of deformation at different scales. Self-consistentapproaches are common mean-field homogenization methods used to link crystal deformationmechanisms to the overall behavior of heterogeneous materials

Prediction of the cyclic behavior of 316ln stainless steel at room temperature by a dislocation-based cyclic viscoplastic model

International audienceA polycrystalline dislocation-based cyclic viscoplastic model is proposed to predict the cyclic behaviour of 316LN austenitic stainless steels at room temperature (RT). The evolution laws of the densities of different populations of dislocations are described, by taking into account the physical mechanisms of crystal viscoplasticity. The comparison between the predictions and corresponding experimental results shows that the cyclic behaviour of 316LN stainless steel is reasonably well described, particularly since a very reduced number of adjusted parameters is used and only tensile and relaxation curves are used in the adjustment procedure

Experimental study and analysis of microplastic behavior of microheterogeneous metallic materials

International audienceno abstrac

Étude expérimentale et analyse du comportement microplastique de matériaux microhétérogènes à base métallique

International audienceno abstrac

Development of a standard for fusion needs example of introduction of Eurofer in RCC-MRX

International audienceThe 2018 edition of the RCC-MRx Code [1] will be issuedby the end of the 2018, in French and English versions byAFCEN (Association Francaise pour les regles de Conceptionet de Construction des Materiels des Chaudieres Electronucleaires).This Code set up design and construction rules ofresearch reactor components (coming from the RCC-MX 2008code developed within the context of the Jules HorowitzReactor project), and to components operating at hightemperature and to the Vacuum Vessel of ITER (coming fromthe RCC-MR 2007).The extension of the scope of the code to innovativesystems such as fusion reactors leads to revisit the backgroundof the code to define the requirements to introduce a newprocess or a new material.The developed methodology has been applied to theintroduction of the Fe9%Cr1%WTaV steel (Eurofer), todayin the Probationary Phase Rules of RCC-MRx. It was the firsttime to introduce a new material into the code, new in thesense of non-existing in any current standardization. Thisprocess, still in progress, highlights the need to have aminimum of information on the expectation of the coderegarding the material data.This paper describes the different steps of the introductionof the Eurofer in the RCC-MRx code as well as the toolsdeveloped to facilitate the process