Development of a multi-scale creep modeling approach PhD Carlos ROJAS
Development of a multi-scale creep modeling approach
Creep is the dominant deformation and damage mechanism occurring in metallic materials exposed to long-term high-temperature loadings. Additionally, the combination of thermal and environmental conditions may induce changes in the material microstructure. This results in a complex creep deformation response where classical models cannot be reliably applied.
In this research, a multi-scale creep-fatigue model is developed by coupling a micro-scale approach and a macro-scale law. The first consists in a mean-field creep approach, where the creep deformation is calculated from terms representing the physical interaction between key microstructural features involved in creep (e.g., dislocation densities, precipitate kinetics, solid-solution atoms, material substructure, etc). The latter consists in a Chaboche-type unified viscoplastic constitutive model implemented in Lagamine, where the viscoplastic function is adapted to address the complex creep response of the alloy in a phenomenological and computationally efficient manner.
PhD candidate : ROJAS ULLOA Carlos Eduardo
Supervisor : Anne Marie Habraken
