36 months

[Filled] Surface hardening and fatigue behaviour of titanium alloys induced by multi-interstitial followed by mechanical surface treatments: effect of property gradient

This PhD offer has already been filled. The objective of our project is to open new routes to the improvement of the tribological properties of titanium alloys. To achieve this objective, a combination of thermochemical (multi-interstitial diffusion at moderate temperature) and mechanical (Surface Mechanical Attrition: SMAT) surface treatments will be considered. The underlying hypothesis of this research is that this combination will allow the formation of hard layers supported by a thick supporting layer with smooth mechanical property gradients together with the preservation of the macroscopic mechanical resistance of the alloys. Surface hardness will be used as an indicator for the treatment’s efficiency, and mechanical testing (including in situ tensile tests operated in SEM and fatigue testing) will be conducted to study the evolution of the damaging mechanisms of the material.
PICHON Luc - Contacter
GUITTON Antoine - Contacter
Institut Pprime / LEM3
Poitiers / Metz

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Instability development at the interface of viscous heterocharged fluids

The proposed studies will relate to a low Reynolds laminar flow of a two-dimensional mixture layer of a highly viscous dielectric fluid. The fluid / fluid interface will be studied experimentally under different conditions. This subject is part of action 5.1 of the INTERACTIVES labex, action which concerns the manipulation of internal flow by electrical discharge and charge injection.

3 ans


We propose to numerically derive closed-loop control strategies of different flows. We will treat the numerical simulation aspects of physical mechanisms (electrodynamics and fluid mechanics) and the development of innovative control strategies (Data Driven approaches based on machine learning methods). We will study two rather emblematic types of flows: - The flow behind an obstacle (cylinder, wing profile, backward facing step). This type of strongly separated flow is particularly interesting in cases where the objective of the control is to increase aircraft stealth.