抄録
Analysis of transient elastohydrodynamic lubrication for wavy surface contact exposed to oscillatory entrainment velocity with a Newtonian and a non-Newtonian lubricant under various surface waviness parameters of the point contact problem are presented in this paper. A sinusoidal wave characterized by two parameters of wavelength and amplitude is utilized to depict a statistical micro-contact model. To investigate the impact of lubricant rheology for Newtonian and non-Newtonian lubricants through the Ree-Eyring model, the Newton-Raphson approach along with the Gauss-Seidel iterative technique is employed to address the time-dependent Reynolds equation alongside surface deformation and statistical asperity models. The numerical results showed that the trend of the variation in central film thickness over time for non-Newtonian lubricant resembles that of Newtonian lubricant; however, a decrease in film thickness and a pressure spike were observed, unlike what is seen with Newtonian lubricants. It is evident that as the roughness amplitude rises, the distortion in the central film thickness caused by frequency diminishes. Furthermore, the findings indicated that, the behavior of transient elastohydrodynamic lubrication is really affected by the nonlinear interaction of surface waviness and non-Newtonian lubricant rheology, which lowers the pressure spike and film thickness.
