The ‘Best Poster Award’ went to Marie Bouyx at the 10th International Conference on Fatigue Design organized by CETIM on November 29 and 30, 2023 in Senlis for her poster Numerical modeling of fatigue testing for small crack propagation from artificial defect.
Marie, PhD student at GeM within the UTR MELANI under the supervision of Julien Réthoré, is preparing a thesis on “Propagation of short cracks in interaction with the microstructure” at ONERA Châtillon (Office National d’Études et de Recherches Aérospatiales).
Her work focuses on studying the damage tolerance of aeronautical parts in the presence of a defect. The aim is to understand the regime of short fatigue cracks. The material studied is a nickel-based superalloy used to manufacture turbine disks in aircraft turbojet engines. The microcracks studied are initiated by an artificially generated surface defect.
The objective is to study the specific regime of short cracks and analyze the effects of the surrounding microstructure (in particular the influence of grain boundaries) on crack characteristics and propagation mechanisms. Since such simulations, representing the entire microstructure, are not feasible (either at part or specimen scale), a patch-based approach recently developed at ONERA is used. The poster below presents its application to realistic numerical reproductions of experimental tests with crack propagation in a material currently restricted to anisotropic heterogeneous elastic behavior.