Dissertation/ Thesis
A novel treatment of Greenwood-Johnson's mechanism of transformation plasticity for steels and alloys ; Approche renouvelée du mécanisme de Greenwood-Johnson de la plasticité de transformation pour les aciers et alliages
| العنوان: | A novel treatment of Greenwood-Johnson's mechanism of transformation plasticity for steels and alloys ; Approche renouvelée du mécanisme de Greenwood-Johnson de la plasticité de transformation pour les aciers et alliages |
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| المؤلفون: | El Majaty, Youssri |
| المساهمون: | Institut Jean Le Rond d'Alembert (DALEMBERT), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université, Jean-Baptiste Leblond, Renald Brenner |
| المصدر: | https://theses.hal.science/tel-03628806 ; Matériaux. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS092⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Transformation plasticity, Greenwood-Johnson's mechanism, Limit-analysis and homogenization, FFT-based simulations, Spherical and spheroidal phase nucleation/growth, JMAK's model, Plasticité de transformation, Mécanisme de Greenwood-Johnson, Analyse-limite et homogénéisation, Simulations à base de FFT, Germination/croissance de phase sphérique et sphéroïdal, Modèle JMAK, [SPI.MAT]Engineering Sciences [physics]/Materials |
| الوصف: | The work exposed in this manuscript relates to the analytical and numerical modeling of Greenwood-Johnson’s mechanism of transformation plasticity for metals and alloy. This is essential for the numericalsimulations of industrial metal subjected to thermomechanical processes at high temperature such as welding and quenching.A model to describe the phenomenon of transformation plasticity was developed in 1989 by J.B. Leblond,based on a simplified micromechanical approach. One of the objectives of this work is to take up this model, but from a more rigorous approach based on the combination of the theories of limit analysis and homogenization.This not only makes it possible to relax the excessive hypotheses introduced in the 1989’s analysis, but above all to describe effects that are known experimentally, but which this analysis could not by nature understand, such as the non linear growth of the plasticity effect of transformation with applied stress, or even to be able to investigate in the effects of shapes of nuclei in non-spherical growth.In order to check the consistency of the new theoretical approach as well as to improve it, the study is devoted to numerical simulations using an FFT-based calculation method more robust than the standard finite element method. Numerical modeling will also make it possible to analyze the effects of interactions between nuclei and the effects of nucleation and growth. ; Le travail exposé dans ce manuscrit concerne la modélisation analytique et numérique du mécanisme de Greenwood-Johnson de la plasticité de transformation des métaux et des alliages. Cette étude est primordiale pour les simulations numériques de pièces métalliques industrielles soumises à des procédés thermo-mécaniques à haute température, tels que le soudage et la trempe.Un modèle fondée sur une approche micro-mécanique simplifiée permettant de décrire le phénomène de la plasticité de transformation a été développé en 1989 par J.B. Leblond. L’objectif de cette thèse est alors de reprendre les bases de ce ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| Relation: | NNT: 2021SORUS092; tel-03628806; https://theses.hal.science/tel-03628806; https://theses.hal.science/tel-03628806/document; https://theses.hal.science/tel-03628806/file/EL_MAJATY_Youssri_2021.pdf |
| الاتاحة: | https://theses.hal.science/tel-03628806 https://theses.hal.science/tel-03628806/document https://theses.hal.science/tel-03628806/file/EL_MAJATY_Youssri_2021.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.8FBE000D |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |