Dissertation/ Thesis
Link between the microstructure and the durability of polycrystalline materials at high temperature : numerical study of intergranular damage ; Modèle d'endommagement de fatigue en lien avec la microstructure dans un alliage d'aluminium
| العنوان: | Link between the microstructure and the durability of polycrystalline materials at high temperature : numerical study of intergranular damage ; Modèle d'endommagement de fatigue en lien avec la microstructure dans un alliage d'aluminium |
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| المؤلفون: | Lenglet, Manon |
| المساهمون: | Centre des Matériaux (CDM), Mines Paris - PSL (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, Samuel Forest |
| المصدر: | https://pastel.hal.science/tel-04673328 ; Matériaux. Université Paris sciences et lettres, 2024. Français. ⟨NNT : 2024UPSLM007⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2024 |
| المجموعة: | MINES ParisTech: Archive ouverte / Open Archive (HAL) |
| مصطلحات موضوعية: | Microstructure, Intermetallic phases, Fatigue damage, Crystal plasticity, Aluminum alloy, Short crack, Phases intermétalliques, Fatigue, Plasticité cristalline, Alliage d'aluminium, Fissure courte, [CHIM.MATE]Chemical Sciences/Material chemistry |
| الوصف: | In the aeronautical field, a major challenge lies in optimizing the sizing of components, taking into account their fatigue life. Fatigue phenomena in metallic structures, such as those in the aluminum 2139 fuselage, depend on microstructure. However, understanding and modeling these phenomena at such a fine scale are expenseive. So far, fatigue damage, defined by the initiation and propagation of fatigue cracks, is only considered at the macroscopic scale: this underestimates the life of components, leading to oversizing and expensive testings.On one hand, experimentally, the mechanical behavior of 2139 under monotonic loading at the microscopic scale and cyclic loading at the macroscopic scale is well understood. However, the behavior of this alloy under both cyclic loading and at the microscopic scale is not documented. On the other hand, numerous numerical methods have been developed to predict the initiation of fatigue cracks. Fatigue Indicator Parameters (FIPs) offer an economical and easy-to-implement approach, but there is no consensus on the most relevant FIP. Moreover, although methods exist to model crack propagation in polycrystals, there is no single method using FIPs to model both crack initiation and propagation.Thus, this thesis aims to develop a method to model the initiation and propagation of fatigue cracks at the microstructure scale. To apply this method to the case of 2139, various tools have been used, including finite element simulations with Z-set. The structural zoom has been used to model intermetallic phases, sites of crack initiation, and the adaptive remeshing module Z-cracks has been employed to model crack initiation and propagation in the alloy. An experimental campaign has also characterized the cyclic behavior of the alloy for simulations, and with optical and electron microscopy, it has been possible to track crack initiation and propagation on the surface at the scale of a few microns. ; Dans le domaine aéronautique, un défi majeur réside dans l'optimisation du ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| Relation: | NNT: 2024UPSLM007; tel-04673328; https://pastel.hal.science/tel-04673328; https://pastel.hal.science/tel-04673328/document; https://pastel.hal.science/tel-04673328/file/2024UPSLM007_archivage.pdf |
| الاتاحة: | https://pastel.hal.science/tel-04673328 https://pastel.hal.science/tel-04673328/document https://pastel.hal.science/tel-04673328/file/2024UPSLM007_archivage.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.217998F7 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |