36 months

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

[TheChamp-Sharing]
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
France
Poitiers / Metz

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12 months

POST-DOC (M/F) - Control by Machine Learning of bluff body wakes

At the CNRS-Laboratory PPRIME, based at the Futuroscope, this post-doctorate position is part of the French ANR COWAVE program between the laboratories PRISME in Orleans, Pprime in Poitiers, LHEEA in Nantes and the PSA automotive industry. This Post-Doc position concerns the Pprime contribution to the COWAVE project which aims the experimental exploration of closed-loop wake control strategies with mobile flaps in a water tunnel facility. Three-dimensional bluff-body wakes generate pressure drag and side forces and thus contribute significantly to the fuel consumption and pollutant emission of road vehicles. Despite this crucial impact and the numerous attempts to reduce harmful environmental effect of bluff body wakes by flow control it is still unclear what is the most efficient control strategy! In this context, the ANR project COWAVE addresses two fundamental aspects of wake control: - First, what kind of actuators are most efficient? While most closed-loop control strategies use viscous entrainment effects to actuate the shear layers in the wake, the exploitation of pressure forces produced by mobile deflectors could be an interesting alternative to be tested. - Second, for the implementation of closed-loop control, we want to test if control strategies obtained by machine learning techniques allow to obtain better efficiency and robustness than the more classical model-based approaches? The proposed Post-Doc position is part of the French ANR COWAVE program between the laboratories PRISME in Orleans, Pprime in Poitiers, LHEEA in Nantes and the PSA automotive industry. This Post-Doc position concerns the Pprime contribution to the COWAVE project which aims the experimental exploration of closed-loop wake control strategies with mobile flaps in a water tunnel facility. APPLY Follow link / Application Deadline : 12 March 2021 https://bit.ly/3qDG6Ml