Transient effects of squeeze and starvation in an EHL contact under forced oscillation: On the film-forming capability. (October 2020)

• Record Type: Journal Article
• Authors: Yahiaoui, M.; Mazuyer, D.; Cayer-Barrioz, J.
• Is Part Of: Tribology international. Volume 150(2020)
• Publication Date: 2020-10
• Subjects: Elastohydrodynamic lubrication -- Time-varying conditions -- Reynolds equation -- Film thickness -- Reciprocating sliding; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2020.106375
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: This study provides a new insight on the EHL regime in time-varying conditions. A full-analytical resolution of the Reynolds equation was proposed considering forced oscillations. Confronted to experimental validation, the analytical film thickness equations provide perfect modeling of the film forming mechanisms: squeeze induced by the transient evolution of the film thickness with time, asymmetry and hysteresis in the film distribution resulting from the change in direction and the transport effect. Furthermore, the analytical equations combined with a modulation of the inlet flow give an accurate prediction of the effects induced by the starvation resulting from the change in direction, i.e. as the original outlet zone becomes the next inlet zone. Highlights: An analytical of the Reynold's equation by considering the time dependence. The measured and calculated lubricant film thickness time evolution is hysteretic. The squeeze and the residence time influence is retrieved in the calculation. A starvation effect is produced by the cavitation wake crossover during sliding. The starvation is calculated with an adaptation of Chevalier's reduction parameter.