A quantitative solution for the full shear-thinning EHL point contact problem including traction

作者：Liu Yuchuan^*; Wang Q Jane; Bair Scott; Vergne Philippe

来源：Tribology Letters, 2007, 28(2): 171-181.

DOI：10.1007/s11249-007-9262-5

• EHL
• non-Newtonian
• numerical simulation
• film thickness
• traction

We present a realistic elastohydrodynamic lubrication (EHL) simulation in point contact using a Carreau-like model for the shear-thinning response and the Doolittle-Tait free-volume viscosity model for the piezoviscous response. The liquid lubricant modeled is a high-viscosity polyalphaolefin which has been shown by high-pressure viscometry to possess a relatively low threshold for shear-thinning as a single-component liquid lubricant. As a result, the measured EHL film thickness is about one-half of the Newtonian prediction. We derived and numerically solved the two-dimensional generalized Reynolds equation for the modified Carreau model based on Greenwood. In this simulation, viscosity was not treated as an adjustable parameter; the models used for the pressure and shear dependence of viscosity were obtained entirely from viscometer measurements. Truly remarkable agreement is found in the comparisons of simulation and experiment for traction coefficient and for film thickness in both pure rolling and sliding cases.

• 出版日期2007-11
• 单位西北大学