Description

This PhD project aims to understand and model the deformation and ductile fracture mechanisms in notch-sensitive Ni-based superalloys (such as René 65), used for aeronautical turbine disks. An approach combining advanced experimental methods (DIC, in situ X-ray tomography) and numerical simulations will be developed to identify the initiation and propagation mechanisms of strain and damage under complex loading conditions.

Skills required

Typical profile for a thesis at MINES Paris: Engineer and / or Master of Science - Good level of general and scientific culture. Good level of knowledge of French (B2 level in french is required) and English. (B2 level in english is required) Good analytical, synthesis, innovation and communication skills. Qualities of adaptability and creativity. Teaching skills. Motivation for research activity. Coherent professional project. Prerequisite (specific skills for this thesis): Applicants should supply the following : • a detailed resume • a copy of the identity card or passport • a covering letter explaining the applicant’s motivation for the position • detailed exam results • two references : the name and contact details of at least two people who could be contacted • to provide an appreciation of the candidate • Your notes of M1, M2 • level of English equivalent TOEIC to be sent to recrutement_these@mat.mines-paristech.fr

Bibliography

[1] Guillermin, N. (2022). Détection et simulation d'instabilités viscoplastiques dans les disques de turbines (Doctoral dissertation, Université Paris sciences et lettres).
[2] Barrot, E. (2026). Evolution de surface de charge et identification d'un comportement prédictif des redistributions de contraintes dans un disque de turbine (Doctoral dissertation, Université Paris sciences et lettres).
[3] Ren, S. C., Morgeneyer, T. F., Rousselier, G., Mazière, M., & Forest, S. (2025). Re-straining induced triggering of Portevin-Le Chatelier effect in recrystallized 2198 T3 and T8 aluminium alloy: Experimental observations and FE simulations for smooth and notched samples. International Journal of Solids and Structures, 113636
[4] Morgeneyer, T. F., Taillandier-Thomas, T., Helfen, L., Baumbach, T., Sinclair, I., Roux, S., & Hild, F. (2014). In situ 3-D observation of early strain localization during failure of thin Al alloy (2198) sheet. Acta Materialia, 69, 78-91.
[5] Gille, M., Proudhon, H., Oddershede, J., Quey, R., & Morgeneyer, T. F. (2024). 3D strain heterogeneity and fracture studied by X-ray tomography and crystal plasticity in an aluminium alloy. International Journal of Plasticity, 183, 104146.

Keywords

Experimental, ductile fracture , size effect , initiation, propagation ; plasticity , localization ; Ni-based superalloy