Punit Kumar and Niraj Kumar
Traction Behavior of Linear PiezoViscous Lubricants in Rough Elastohydrodynamic Lubrication Contacts
1254 - 1261
2016
10
7
International Journal of Mechanical and Mechatronics Engineering
https://publications.waset.org/pdf/10004901
https://publications.waset.org/vol/115
World Academy of Science, Engineering and Technology
The traction behavior of lubricants with the linear pressureviscosity response in EHL line contacts is investigated numerically for smooth as well as rough surfaces. The analysis involves the simultaneous solution of Reynolds, elasticity and energy equations along with the computation of lubricant properties and surface temperatures. The temperature modified DoolittleTait equations are used to calculate viscosity and density as functions of fluid pressure and temperature, while Carreau model is used to describe the lubricant rheology. The surface roughness is assumed to be sinusoidal and it is present on the nearly stationary surface in nearpure sliding EHL conjunction. The linear PV oil is found to yield much lower traction coefficients and slightly thicker EHL films as compared to the synthetic oil for a given set of dimensionless speed and load parameters. Besides, the increase in traction coefficient attributed to surface roughness is much lower for the former case. The present analysis emphasizes the importance of employing realistic pressureviscosity response for accurate prediction of EHL traction.
Open Science Index 115, 2016