Résistance thermique de contact statique. Évaluation expérimentale des performances d'un modèle à deux résistances issu d'une description probabiliste des déformations de l'interface

Abstract

The thermal contact resistance (TCR) has been measured for two pairs of metallic samples, at different pressures, with the aim of checking the performances of a theoretical model issued from a statistical description of interfacial deformation. The model used the theories of Greenwood and Williamson on the one hand, Whitehouse, Archard and Onions on the other hand, for pressed roughs contacts. The model predicts the thermal contact resistance as a function of contact load P by the computation of three parameters: n (number of contact spots per unit area), ζ 2 (surfacic contact factor) and e (mean interfacial gap). Microgeometry measurements provide the values of surfacic parameters σ and τ. The test apparatus allows the comparison between theoretical predictions for TCR and measurements.