Details
| Original language | English |
|---|---|
| Article number | 106694 |
| Journal | Tribology International |
| Volume | 154 |
| Early online date | 1 Oct 2020 |
| Publication status | Published - Feb 2021 |
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.
Keywords
- Coefficient of friction, EHL, Friction, Thermal effects
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Tribology International, Vol. 154, 106694, 02.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Scale and contact geometry effects on friction in thermal EHL
T2 - twin-disc versus ball-on-disc
AU - Liu, Haichao
AU - Zhang, Bing
AU - Bader, Norbert
AU - Venner, C. H.
AU - Poll, Gerhard
N1 - Funding Information: The authors appreciate Dr. Björling and Prof. Vergne for sharing ball-on-disc traction curves of squalane. This work is partly supported by FVV-Research Association for Combustion Engines e.V., Germany , through Grant No. 6012773 . The first two authors would like to acknowledge the China Scholarship Council (CSC) for providing the scholarship.
PY - 2021/2
Y1 - 2021/2
N2 - 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.
AB - 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.
KW - Coefficient of friction
KW - EHL
KW - Friction
KW - Thermal effects
UR - http://www.scopus.com/inward/record.url?scp=85092524854&partnerID=8YFLogxK
U2 - 10.1016/j.triboint.2020.106694
DO - 10.1016/j.triboint.2020.106694
M3 - Article
AN - SCOPUS:85092524854
VL - 154
JO - Tribology International
JF - Tribology International
SN - 0301-679X
M1 - 106694
ER -