Abstract: According to the rheological behavior of visco-plastic fluid lubricants in convergent wedge at high-speed and high-pressure, the visco-plastic hydrodynamic lubrication equation considering boundary slip is extracted by selecting the Smith rheological model. And for the hydrodynamic lubrication with constant viscosity and incompressible lubricants at isothermal condition, the initial boundary slip position, the development process and distribution of boundary slip field are determined in the light of shear stress distribution and maximum shear stress position of lubricants. The performance and wall slip behavior of visco-plastic hydrodynamic lubrication in various film thickness ratio convergent wedge at different moving lubrication surface speed are also analyzed and contrasted with the solutions at traditional hydrodynamic lubrication by means of solving visco-plastic hydrodynamic lubrication equations at different fields together, results indicate significant influences of film thickness ratio and moving lubrication surface speed on visco-plastic hydrodynamic lubrication performance and boundary slip behavior.

Key words: visco-plastic;limiting shear stress;boundary slip;lubrication performance