Étude numérique et expérimentale de la résistance thermique de contact aux interfaces LAITON-SAPHIR

Abstract

The thesis topic relied to the theme of mechanics and thermal interaction of solid-solid contact. It focuses on the analysis of the mechanical phenomena involved in metal interfaces and their effect on heat transfers through the very thin heterogeneous layer known as the transition layer which extends on both sides of the theoretical plane of contact. For a long time, this theme raised an interest and there are numerous articles dedicated to the characterization of interfaces as well as to the modeling of thermal resistance of contact. It, should also be noted that in all industrial sectors, including the automobile, aeronautics and the material shaping industry, the knowledge requirements and the mastery of mechanical and thermal phenomena at metal interactions are becoming increasingly important. In practice, the analysis of heat transfer phenomena at this level uses the concept of thermal contact resistance (TCR). This resistance is related to the actual contact pressure and geometric parameters characterizing the surfaces of the solids at the interface. Thus the mechanical deformation of the surfaces involved in contact and the evolution of their mechanical properties during loading have a decisive effect on the heat transfers in this area. This work completes the study of B. Bensaad’s thesis on sapphire-brass thermal contact resistance with an experimental approach. The objective of the study is to develop a mixed approach (numerical/semi- empirical) which consists of using semi-empirical model sempirical using as input variables quantities determined by numerical simulations by finite elements which allow the TCR to be calculated taking into account the phenomena involved in the contact: roughness of the contact surfaces, pressure, temperatures, etc. The numerical model will be validated using the results obtained by B. Bensaad study.