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dc.contributor.author
 hal.structure.identifier
SOULACROIX, Julian
92792 CEA-Direction de l'Energie Nucléaire [CEA-DEN]
dc.contributor.author
 hal.structure.identifier
MICHEL, Bruno
92792 CEA-Direction de l'Energie Nucléaire [CEA-DEN]
dc.contributor.author
 hal.structure.identifier
GATT, Jean-Marie
92792 CEA-Direction de l'Energie Nucléaire [CEA-DEN]
dc.contributor.authorKUBLER, Régis
dc.contributor.author
 hal.structure.identifier
BARRALLIER, Laurent
211915 Mechanics surfaces and materials processing [MSMP]
211915 Mechanics surfaces and materials processing [MSMP]
dc.date.accessioned2014
dc.date.available2014
dc.date.issued2014
dc.date.submitted2014
dc.identifier.issn0749-6419
dc.identifier.urihttp://hdl.handle.net/10985/8335
dc.descriptionThis work has been achieved in the framework of the PLEIADES project, financially supported by CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives), EDF (Électricité de France) and AREVA.
dc.description.abstractA model reproducing strain softening behavior in ceramic materials is proposed, base on a critical treatment of previous mechanical experimental results on uranium dioxide. The main hypothesis is that the strain softening phenomenon is related to an ageing process, where some point defects move towards the dislocations and modify their velocity. This is different from most of models used up to now, as they were based on the hypothesis that only the initial lack of dislocations was responsible of the strain softening behavior. A model is first developed in a simple 1D framework. Evolution of the mechanical behavior with strain rate and temperature is well reproduced by this model. Then, the 1D model is extended to a 3D mechanical model, and mechanical compressive tests on UO2 pellets are simulated. The 3D model well reproduces the observed asymmetrical shape of the compressed pellet if one considers that the material is not initially perfectly homogeneous, which highlights the importance of accounting for spatial heteregeneity of materials in models.
dc.language.isoen_US
dc.publisherInternational Journal of Plasticity
dc.rightsPost-print
dc.subjectCeramics
dc.subjectUranium dioxide
dc.subjectStrain softening
dc.subjectMechanical behavior
dc.subjectAgeing
dc.titleAn ageing elasto-viscoplastic model for ceramics
dc.typdocArticles dans des revues avec comité de lecture
dc.localisationCentre de Aix en Provence
dc.subject.halSciences de l'ingénieur: Mécanique
dc.subject.halSciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des matériaux
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des structures
ensam.audienceInternationale
ensam.page1-29
ensam.journalInternational Journal of Plasticity
hal.identifierhal-01021798
hal.version1


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