Scale and contact geometry effects on friction in thermal EHL
twin-disc versus ball-on-disc
- verfasst von
- Haichao Liu, Bing Zhang, Norbert Bader, C. H. Venner, Gerhard Poll
- Abstract
Plint (IMechE 182 (1):300–306,1967) reported a reduced coefficient of friction with increasing roller sizes in EHL traction measurements. In this study, a similar scale effect has been observed when comparing measured traction curves at the same operating conditions between a ball-on-disc rig and a twin-disc machine of different geometrical sizes. This scale effect has been studied numerically for point contacts of different radii of curvature Rx based on thermal EHL simulations. Results show that the reduced friction for large Rx is caused by an increase in film thickness and the enhanced thermal effects. The mechanisms are: (1) heat is hard to conduct across a thicker EHL film due to bad thermal conductivity; (2) shear is mainly localized in the middle film.
- Organisationseinheit(en)
-
Institut für Maschinenkonstruktion und Tribologie
- Externe Organisation(en)
-
University of Twente
- Typ
- Artikel
- Journal
- Tribology International
- Band
- 154
- ISSN
- 0301-679X
- Publikationsdatum
- 02.2021
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Werkstoffmechanik, Maschinenbau, Oberflächen und Grenzflächen, Oberflächen, Beschichtungen und Folien
- Elektronische Version(en)
-
https://doi.org/10.1016/j.triboint.2020.106694 (Zugang:
Geschlossen)
