Enhancement of a full field finite element framework to model recrystallization in context of strong anisotropies of mobility and grain boundary energy

par David alejandro Ruiz Sarrazola

Projet de thèse en Mécanique numérique et Matériaux

Sous la direction de Marc Bernacki et de Daniel Pino muñoz.

Thèses en préparation à Paris Sciences et Lettres , dans le cadre de SFA - Sciences Fondamentales et Appliquées , en partenariat avec Centre de Mise en Forme des Matériaux (laboratoire) et de École nationale supérieure des mines (Paris) (établissement de préparation de la thèse) depuis le 07-11-2017 .


  • Résumé

    In order to accurately describe the 3D evolution of polycrystals (recrystallization, phase transformations…), full-field methods such as the phase-field (PF) or the level-set (LS) methods have to be employed. In this context, a new FE numerical framework to model grain growth (GG) and recrystallization (ReX) based on a LS description of the interfaces and meshing/remeshing capabilities has been recently developeda. Nowadays, the LS approach is used for Rex/GG modeling in the context of uniform grids with a finite-difference formulation or in a FE framework on unstructured mesh. LS method is also particularly interesting for the modeling of Smith-Zener pinning. These PhD works will be dedicated to the enhancement of the existing formalism in order to be able, in a smart and efficient way, to deal with strong and local anisotropies of mobility and grain boundary energy. This aspect is today a strong numerical difficulty for existing full field numerical approaches. Moreover a new modular crystal plasticity finite element method will be employed/ improved during the PhD. DRX (as illustrated in the figure) and SRX phenomema for different austenitic stainless steels will be investigated with these developments and validated thanks to existing experimental results. Finally, the resulting developments will be prepared for integration in the DIGIMU® software package.

  • Titre traduit

    Enhancement of a full field finite element framework to model recrystallization in context of strong anisotropies of mobility and grain boundary energy


  • Résumé

    In order to accurately describe the 3D evolution of polycrystals (recrystallization, phase transformations…), full-field methods such as the phase-field (PF) or the level-set (LS) methods have to be employed. In this context, a new FE numerical framework to model grain growth (GG) and recrystallization (ReX) based on a LS description of the interfaces and meshing/remeshing capabilities has been recently developeda. Nowadays, the LS approach is used for Rex/GG modeling in the context of uniform grids with a finite-difference formulation or in a FE framework on unstructured mesh. LS method is also particularly interesting for the modeling of Smith-Zener pinning. These PhD works will be dedicated to the enhancement of the existing formalism in order to be able, in a smart and efficient way, to deal with strong and local anisotropies of mobility and grain boundary energy. This aspect is today a strong numerical difficulty for existing full field numerical approaches. Moreover a new modular crystal plasticity finite element method will be employed/ improved during the PhD. DRX (as illustrated in the figure) and SRX phenomema for different austenitic stainless steels will be investigated with these developments and validated thanks to existing experimental results. Finally, the resulting developments will be prepared for integration in the DIGIMU® software package.