Dissertation/ Thesis
Field measurements and finite element simulations of the interaction between dynamic strain ageing and ductile damage in metallic alloys ; Mesures de champs et simulations par élément finis de l'interaction entre vieillissement dynamique et endommagement dans les alliages métalliques
| العنوان: | Field measurements and finite element simulations of the interaction between dynamic strain ageing and ductile damage in metallic alloys ; Mesures de champs et simulations par élément finis de l'interaction entre vieillissement dynamique et endommagement dans les alliages métalliques |
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| المؤلفون: | Ren, Sicong |
| المساهمون: | Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres, Thilo Morgeneyer, Matthieu Mazière, Samuel Forest |
| المصدر: | https://pastel.archives-ouvertes.fr/tel-01843228 ; Materials. Université Paris sciences et lettres, 2018. English. ⟨NNT : 2018PSLEM001⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2018 |
| المجموعة: | Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
| مصطلحات موضوعية: | Portevin–Le Chatelier effect, Industrial alloys, Finite element simulation, 3D in-Situ laminography, Digital image correlation, Ductile fracture, Effet Portevin-Le Chatelier, Simulation par éléments finis, Alliages industriels, Corrélation d'image, Laminographie 3D in-Situ, Rupture ductile, [SPI.MAT]Engineering Sciences [physics]/Materials |
| الوصف: | Recently, in-situ observations by X-ray laminography (at synchrotron) show that the multiple localization bands are the precursors of damage and possibly the slant fracture. These bands can be related to the strain ageing effect (L"uders or Portevin-Le Chatelier (PLC)) whose influence on the fracture is still poorly understood. These effects are observed in many industrial alloys such as 2000 or 5000 series aluminium alloys, or, for example, in the C-Mn steels for which a ductility drop is observed in the temperature range where these effects are most pronounced.The aim of the thesis is to characterize the PLC effect and to evaluate its influence on the development of ductile damage and therefore on the final fracture. Firstly, the influence of strain ageing on strain hardening was introduced in a model based on the dislocation density using results from the literature. Secondly, several 2000 series aluminium alloys and a C-Mn steel were investigated by mechanical tests combined with Digital Image Correlation. The premature triggering of localization bands was observed in tensile tests involving relaxation, unloading and strain rate jump for certain aluminium alloys. The bands around the notch in the specimens of C-Mn steel were observed at high temperature. Two different modes of fracture were observed at the two temperatures. These results are compared with those produced with the KEMC model. Thirdly, a constitutive model combining the strain ageing (type KEMC) and damage (type Rousselier) was developed in order to explain the experimentally observed interactions between these two phenomena. ; Récemment, les observations in-situ par laminographie aux rayons X (au synchrotron) montrent que les multiples bandes de localisation sont les précurseurs de l'endommagement et éventuellement de la rupture en biseau. Ces bandes peuvent être liées aux phénomènes de vieillissement par la déformation (type effet de L"uders ou Portevin-Le Chatelier (PLC)) dont l'influence sur la rupture est encore mal compris. Ces effets ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| Relation: | NNT: 2018PSLEM001; tel-01843228; https://pastel.archives-ouvertes.fr/tel-01843228; https://pastel.archives-ouvertes.fr/tel-01843228/document; https://pastel.archives-ouvertes.fr/tel-01843228/file/2018PSLEM001_archivage.pdf |
| الاتاحة: | https://pastel.archives-ouvertes.fr/tel-01843228 https://pastel.archives-ouvertes.fr/tel-01843228/document https://pastel.archives-ouvertes.fr/tel-01843228/file/2018PSLEM001_archivage.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.C94D571E |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |