An original experimental method for measuring friction coefficient during tribofilm formation by accumulating free sliding oscillating responses
Méthode expérimentale originale pour la mesure du coefficient de frottement concomitamment à la formation du tribofilm par accumulation des réponses oscillatoires de glissement libre
Résumé
A new experimental approach is proposed to investigate the friction behaviour and highlight the relationship
with the tribofilm formation. It is based on the accumulation of several free dynamic responses of a singledegree-
of-freedom damped oscillating system on the same sliding surfaces. By analysing the decreasing
amplitude of the damped free dynamic responses and their associated energy decays, it is not only possible
to describe the evolution of the tribological behaviour, but also to accurately identify velocity-dependent
and velocity-independent friction contributions as the gradually formation of tribofilm. To demonstrate the
relevance of this original technique, two tribosystems were studied, each lubricated with either base oil or
formulated one, and by comparing the results with those obtained by a conventional linear tribometer.