TY - JOUR

T1 - Influences of solid and lubricant thermal conductivity on traction in an EHL circular contact

AU - Liu, Haichao

AU - Zhang, Bing

AU - Bader, Norbert

AU - Poll, Gerhard

AU - Venner, C. H.

N1 - Funding information: The authors would like to thank Dr. Björling for providing the measured WAM traction curves with squalane. This work is partly supported by FVV-Research Association for Combustion Engines e.V., Germany, through Grant No. 6012773 . The first two authors, Liu and Zhang, would like to acknowledge the China Scholarship Council (CSC) for providing the scholarship.

PY - 2020/6

Y1 - 2020/6

N2 - The influences of thermal conductivity of both the contacting solids and the lubricant on the traction in a rolling/sliding EHL contact have been studied numerically. For through-hardened AISI 52100 bearing steel (k was measured as 21W/mK by Reddyhoff et al. see Tribol Lett 67(1):22, 2019), with the improper but widely used thermal conductivity of 46W/mK in literature, the friction coefficient can be overestimated and the maximum temperature in the lubricating film would be underestimated. The effect of solid thermal conductivity on traction depends on the entrainment speed and the resulting film thickness. For the thermal conductivity of the lubricant, its pressure dependence affects the traction mainly at high speeds and/or at high sliding-to-rolling ratio (SRR) conditions.

AB - The influences of thermal conductivity of both the contacting solids and the lubricant on the traction in a rolling/sliding EHL contact have been studied numerically. For through-hardened AISI 52100 bearing steel (k was measured as 21W/mK by Reddyhoff et al. see Tribol Lett 67(1):22, 2019), with the improper but widely used thermal conductivity of 46W/mK in literature, the friction coefficient can be overestimated and the maximum temperature in the lubricating film would be underestimated. The effect of solid thermal conductivity on traction depends on the entrainment speed and the resulting film thickness. For the thermal conductivity of the lubricant, its pressure dependence affects the traction mainly at high speeds and/or at high sliding-to-rolling ratio (SRR) conditions.

KW - Bearing steel

KW - Thermal conductivity

KW - Thermal EHL

KW - Traction

UR - http://www.scopus.com/inward/record.url?scp=85075362068&partnerID=8YFLogxK

U2 - 10.1016/j.triboint.2019.106059

DO - 10.1016/j.triboint.2019.106059

M3 - Article

AN - SCOPUS:85075362068

VL - 146

JO - Tribology International

JF - Tribology International

SN - 0301-679X

M1 - 106059

ER -