Study On Tribology Performance Of Textured Surface Under Hydrodynamic Lubrication

The research object of Tribology is relative moving surfaces with parts. And its ultimate goalis saving energy and material, improving product quality and extending the life of mechanicalequipment as well as to increase reliability. This is an area, which include lubrication, friction andwear. Surface texturing has gained an increasing interest in recent years as a means for enhancingtribological performance of mechanical components, it is defined as a meso and micro-scalestructure with sure regulation and array, and it is mainly produced on a friction pair surface. Inorder to further understand the lubrication and antifriction mechanism on fully lubricated, andoptimize the surface texturing model. The tribological performance of surface texturing in thispaper is studied as follows:First, a computational fluid dynamics (CFD) model of asymmetric groove texture isdeveloped and solved using a commercial software FLUENT. The effect of asymmetric parameterH and Reynolds number Re on the load-bearingcapacityof oil film is simulated. It is found that theload-bearing capacity is strong depended on asymmetric parameter H and increase with reducingof asymmetric parameter H at low Reynolds number, when the geometry of groove texture isasymmetric. For example, with a Re at20, the load-bearing capacity increases by73.44%with theH varying from4to0.2. However, an increase in Reynolds number Re may reduce this effect.With a Re at160, for example, it has onlyan increase of4.68%at the same conditions.In addition,the numerical results also showed that Reynolds number may significantly influence on the load-bearing capacity, which will monotonicallyincrease with the Reynolds number.Second, a computational fluid dynamics (CFD) model is further developed to study on thehydrodynamic capability of partially surface groove texturing on fully lubricated sliding. This isbecause the improvement of tribological performance for partially surface texture has verified tobetter than tradition one in recent years.The effect of location parameter L on load bearing capacityof oil film is discussed with detail. The location parameter L is used to characterizing a pattern ofarray on friction pair surface. The results show that location parameter L has a significant effect onload bearing capacity at low Reynolds number Re. When L varies from0.4to0.05, for example,the load bearing capacity has an increase of58.99%with a Re of3and a D of0.2, and thecoefficient of friction has a reduction of59.1%at the same condition. Third, a three-dimension computational lubrication model of surface texturing is established.It is based on Reynolds equation and solved using Visual FORTRAN. The hydrodynamicperformances of some groove and cavity textures are analyzed. And a rectangular texture, which isa new type of surface texturing, is proposed. It is found that the different texture has a same optimaldepth range of0.5-0.7. Square and cylindrical cavities have an optimum area density, whichcorrespond to0.36and0.5024respectively. And square texture shows the best performance oftribological compare to other textures. In addition, it is also found that the rectangular texture hasan optimum combination parameter, which is w=0.6, c=0.8, h=0.5-0.7respectively. On the basis ofthis combination parameter, the rectangular texture shows the best load-bearing capacity. And theideal layout about rectangular texture on the friction pairs’ surface is proposed in the final part ofthe paper. This layout has a certain reference value to an actual application of surface texturing.