TY - JOUR
T1 - A numerical study on the impact of lubricant rheology and surface topography on heavily loaded non-conformal contacts
AU - Prajapati, Deepak K.
AU - Ahmad, Dilshad
AU - Katiyar, Jitendra K.
AU - Prakash, Chander
AU - Ajaj, Rafic M.
N1 - Publisher Copyright:
© 2023 IOP Publishing Ltd.
PY - 2023/9
Y1 - 2023/9
N2 - The increasing requirement of high-power density (power throughput/ weight) in modern day machines lead to thin film lubrication condition in various machine components (rolling element bearings, gears, cams, etc,) due to severe loading conditions. Surface roughness features and lubricant rheology plays a vital role in thin film lubrication, and significantly affects the lubrication performance and lifetime of machine components. The present work demonstrates surface topography and lubricant rheology effects on the traction coefficient for heavily loaded non-conformal contacts. The load-sharing concept considering elastic-plastic deformation of asperities, and Carreau shear-thinning rheological model is employed to describe the dry rough contacts and non-Newtonian behavior of lubricant. An influence of surface topography parameters such as roughness, skewness, kurtosis, and pattern ratio on the traction coefficient is discussed. From results, it is found that among different surface topographies, negatively skewed surfaces having isotropic surface pattern exhibit minimum traction coefficient. The load share function and the critical rolling speed are determined for various surface topographies which provides further insights into the surface topography effect on traction coefficient. The findings of present study are noteworthy as they provide a theoretical basis for an assessment of the lubrication performance of heavily loaded non-conformal contacts.
AB - The increasing requirement of high-power density (power throughput/ weight) in modern day machines lead to thin film lubrication condition in various machine components (rolling element bearings, gears, cams, etc,) due to severe loading conditions. Surface roughness features and lubricant rheology plays a vital role in thin film lubrication, and significantly affects the lubrication performance and lifetime of machine components. The present work demonstrates surface topography and lubricant rheology effects on the traction coefficient for heavily loaded non-conformal contacts. The load-sharing concept considering elastic-plastic deformation of asperities, and Carreau shear-thinning rheological model is employed to describe the dry rough contacts and non-Newtonian behavior of lubricant. An influence of surface topography parameters such as roughness, skewness, kurtosis, and pattern ratio on the traction coefficient is discussed. From results, it is found that among different surface topographies, negatively skewed surfaces having isotropic surface pattern exhibit minimum traction coefficient. The load share function and the critical rolling speed are determined for various surface topographies which provides further insights into the surface topography effect on traction coefficient. The findings of present study are noteworthy as they provide a theoretical basis for an assessment of the lubrication performance of heavily loaded non-conformal contacts.
KW - mixed lubrication regime
KW - non-Newtonian lubricant rheology
KW - surface topography
KW - traction coefficient
UR - http://www.scopus.com/inward/record.url?scp=85166046506&partnerID=8YFLogxK
U2 - 10.1088/2051-672X/ace6c2
DO - 10.1088/2051-672X/ace6c2
M3 - Article
AN - SCOPUS:85166046506
VL - 11
JO - Surface Topography: Metrology and Properties
JF - Surface Topography: Metrology and Properties
IS - 3
M1 - 035006
ER -