Premium
Effects of thermally induced inhomogeneous shear and surface thermal boundary conditions on the shear stress in sliding elastohydrodynamic contacts
Author(s) -
Chang Liming
Publication year - 2009
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.84
Subject(s) - shear stress , materials science , shear (geology) , critical resolved shear stress , shear rate , thermal , composite material , lubricant , mechanics , pure shear , lubrication , simple shear , thermodynamics , rheology , physics
Numerous research work has shown that significant thermally induced cross‐film inhomogeneous shear or thermal shear localisation may be developed in sliding elastohydrodynamic lubrication (EHL) contacts with pronounced consequences. This paper uses the theoretical framework established in previous research to further analyse the effects of the shear localisation on the lubricant shear stress and thus the EHL traction. Results obtained suggest that the shear localisation significantly accelerates the thermally induced reduction of the shear stress in sliding EHL contacts. The study also shows dramatic reduction of the shear stress in EHL contacts with one‐insolated surface, which is significantly attributed to the more intensified thermal shear localisation near the insolated surface. The practical significance of the dramatic shear stress reduction is discussed. Copyright © 2009 John Wiley & Sons, Ltd.