Abstract
Friction and lubrication regimes are usually characterized using generalized Stribeck curves. Lubricated friction experiments were carried out using the IRIS tribometer, which allows simultaneous measurement of film thickness distribution in the high-pressure zone and friction force by controlling, accurately and independently, the motions of solids. Transient kinematics combining pure rolling, acceleration, pure sliding and deceleration phases was chosen in order to get access to friction and lubrication mechanisms. It is shown that these transient operating conditions cover all the lubrication regimes that are traditionally obtained through steady-state Stribeck curves. The analytical modelling proposed here emphasizes the role of the local shear rate distribution in full-film regime and the influence of surface in the mixed and boundary regimes.
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