Experimental estimation of transient evolution of three thermal parameters characterizing a dry friction interface

Several studies have been performed to understand the occurred phenomena in a sliding contact interface. Due to a generated heat flux, the sliding contact necessarily induces an increase of the temperature. These temperatures could reach critical value for the system. Thus, it is imperative to anticipate the temperature increase to avoid severe issues. The aim of this study is to be able to determine the evolution of the thermal parameters characterizing sliding interfaces. In order to do this, we develop a new methodology which involves three transient parameters, the intrinsic partition coefficient, the thermal contact resistance and the heat flux generated by friction. The estimation of time dependent thermal sliding contact parameters is performed by an inverse heat conduction problem (IHCP) from temperature measurements. A parametrization technic with a constrained Levenberg Marquardt algorithm is used to regularize and decorrelate the IHCP. An experimental estimation of the evolution of the thermal contact parameters is performed. Several friction scenarios are investigated and show the relevance of the developed methodology.