Elastohydrodynamic Film Collapse During Rapid Deceleration. Part I—Experimental Results

摘要: This paper describes a study of the behavior elastohydrodynamic lubricated contacts subjected to rapid halting. Experiments have been carried out using ultrathin interferometry coupled high-speed camera measure change in lubricant film thickness and shape during fast, controlled deceleration, both pure sliding rolling conditions. Film collapse is seen occur two stages. The first persists throughout deceleration period and, this stage geometry remains almost constant across contact. In collapse, lags behind value predicted from steady-state theory, which means that when motion ceases, thicker than expected present. second ensues entrainment speed falls below critical approximately 0.002 m/s characterized by formation central entrapment classical, normal approach, squeeze behavior.