Abstract:In order to explore the effect of different surface topography on the liquid lubrication characteristics of rough contact interface,based on the finite difference method combined with the Reynolds equation and the film thickness equation,the load distribution and regularity of the four different rough contact interfaces during step lubrication were studied,including ripple shape,random shape and canyon shape.It is found that the threedimensional load distribution laws of these four rough surfaces all correspond to their surface topography,the load is large at the “peak” of the wave,and the friction force is increased with the increase of the load.While the load at the “valley” of the wave is small,and the friction force is decreased with the decrease of the load.However,the change trend of the load of these four rough surfaces with the surface expansion area ratio is different.With the increase of the surface expansion area ratio,the load on the stepped morphology surface is increased linearly,the load on the corrugated morphology surface remains unchanged,the load on the randomly distributed morphology surface is increased,and the load on the canyon morphology surface is increased at first and then decreased.The research results can be used to supplement the existing researches on surface characterization and fluid lubrication.