PhD of MAHO Loic on theses.fr

Abstract :

The objective is to analyze the behavior of the contact (local sliding regimes, effort necessary to induce macroscopic sliding between the two parts, plasticization of the asperities during sliding) as a function of the microgeometry of each of the two parts in contact. This work will be based on a theoretical model of the local behavior of a pair of elastic asperities under normal and tangential (exitant) loading, which will give rise to a step digital implementation for scaling the contact surface (development in Python or Matlab). This model must be completed to take into account local plasticity (use of theoretical models, Abaqus simulations then taken into account in a macro model in Python or Matlab). The results of this digital model will be compared with internal SAE test data and will make it possible to identify the functional elements with respect to a given performance in static friction. Among these are in particular microgeometric parameters describing one and the other of the two surfaces in contact. This would reveal potential for optimizing the microgeometry for a given assembly. This approach will make it possible to arrive at recommendations concerning the specification of surface conditions for controlling the phenomenon of static friction.

CIFRE thesis with Safran Aircraft Engines.

Supevision : Dir. Pr. Tony Da Silva, MCF Maria-Letizia Raffa, MCF Julien Fortes Da Cruz