An ageing elasto-viscoplastic model for ceramics
dc.contributor.author
hal.structure.identifier | SOULACROIX, Julian
|
dc.contributor.author
hal.structure.identifier | MICHEL, Bruno
|
dc.contributor.author
hal.structure.identifier | GATT, Jean-Marie
|
dc.contributor.author | KUBLER, Régis |
dc.contributor.author
hal.structure.identifier | BARRALLIER, Laurent
|
dc.date.accessioned | 2014 |
dc.date.available | 2014 |
dc.date.issued | 2014 |
dc.date.submitted | 2014 |
dc.identifier.issn | 0749-6419 |
dc.identifier.uri | http://hdl.handle.net/10985/8335 |
dc.description | This 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.abstract | A 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.iso | en_US |
dc.publisher | Elsevier |
dc.rights | Post-print |
dc.subject | Ceramics |
dc.subject | Uranium dioxide |
dc.subject | Strain softening |
dc.subject | Mechanical behavior |
dc.subject | Ageing |
dc.title | An ageing elasto-viscoplastic model for ceramics |
dc.typdoc | Article dans une revue avec comité de lecture |
dc.localisation | Centre de Aix en Provence |
dc.subject.hal | Sciences de l'ingénieur: Mécanique |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des matériaux |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des structures |
ensam.audience | Internationale |
ensam.page | 1-29 |
ensam.journal | International Journal of Plasticity |
hal.identifier | hal-01021798 |
hal.version | 1 |
hal.status | accept |