Dissertation/ Thesis
Crack growth in welded structures submitted to fatigue complex loading ; Fissuration en fatigue des structures mécano-soudées soumises à un environnement mécanique complexe
| العنوان: | Crack growth in welded structures submitted to fatigue complex loading ; Fissuration en fatigue des structures mécano-soudées soumises à un environnement mécanique complexe |
|---|---|
| المؤلفون: | Lebaillif, David |
| المساهمون: | Laboratoire de Mécanique et Ingénieries (LAMI), Institut Français de Mécanique Avancée (IFMA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Université Blaise Pascal - Clermont-Ferrand II, Naman Recho |
| المصدر: | https://theses.hal.science/tel-00695047 ; Matériaux. Université Blaise Pascal - Clermont-Ferrand II, 2006. Français. ⟨NNT : ⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2006 |
| المجموعة: | HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand / Université d'Auvergne) |
| مصطلحات موضوعية: | Fatigue Crack Initiation, Crack Growth, Crack Box, Welded Structures, Weld Bead Quality, Crack Opening, Overload, Automatic Remeshing, Mixed-Mode Fracture, Monotonic and Variable loading, Amorçage de Fissures de Fatigue, Propagation de Fissures, Boîtes A Fissures, Structures Soudées, Qualité de Soudure, Ouverture des Fissures, Surcharge, Maillage Automatique Mode Mixte, Chargement Variable et Monotone, [SPI.MAT]Engineering Sciences [physics]/Materials |
| الوصف: | The aim of a fatigue analysis on industrial welded structures submitted to complex loadings is to evaluate the lifetime to initiate a crack and to propagate it, until the failure of the structure occurs. In this study, we present a multi-scale approach, based on the use of finite elements from the global cartography of the damaged zones to the local calculation with cracks inserted in the models. Crack propagation is performed using multi-initiation of cracks at weld toes, Line Spring elements to take into account the flexibility due to cracks and Crack Box Technique allowing to precisely calculate the stress intensity factors. CBT is also used to determine the crack path and to calculate crack closure under variable loads. All these developments have been included in the software VERICRACK to assess crack initiation until failure. This approach has been applied to an overall aluminium welded structure in which, results are in good agreement with calculations. ; Dans ce travail, une démarche d'analyse en fatigue des structures mécano-soudées industrielles soumises à des environnements mécaniques complexes est proposée. Basée sur une approche multi-échelle et sur le principe de superposition, elle utilise la méthode des éléments finis pour déterminer une carte du dommage de la structure avant de se focaliser sur l'amorçage de fissures. La propagation est traitée en couplant l'approche locale du dommage - le multi amorçage -, avec la prise en compte de la souplesse de la stucture fissurée au moyen d'éléments ressorts et grâce au developpement de Boites à Fissures, utilisées pour le calcul des facteurs d'intensité de contrainte, l'analyse de la bifurcation et de l'ouverture des fissures pour les chargements variables. Tous ces développements ont permis de créer une démarche et un outil permettant de traiter, sans remaillage, de l'amorçage d'une fissure jusqu'à la ruine, et qui ont été mis en oeuvre sur une structure industrielle |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| Relation: | tel-00695047; https://theses.hal.science/tel-00695047; https://theses.hal.science/tel-00695047/document; https://theses.hal.science/tel-00695047/file/2006CLF21669.pdf |
| الاتاحة: | https://theses.hal.science/tel-00695047 https://theses.hal.science/tel-00695047/document https://theses.hal.science/tel-00695047/file/2006CLF21669.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.EB0CFBB9 |
| قاعدة البيانات: | BASE |
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edsbas BASE edsbas.EB0CFBB9 758 3 Dissertation/ Thesis dissertation 758.004333496094 |
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