Elastohydrodynamic Lubrication Characteristics Analysis Of Polymer Materials In Microscale Surface Texture

As an important mechanical component supporting bearing parts,sliding bearings bear the main role of relative motion between bearings.The tribological properties of sliding bearings directly affect the service life and working efficiency of the entire mechanical component.Recent studies have shown that surface texture technology can effectively reduce the friction and wear of sliding bearings,extend the mechanical maintenance cycle,reduce energy consumption,and thus improve economic efficiency.Reasonable texture design of the sliding bearing surface can effectively improve the tribological performance of the sliding bearing.Polymer materials have good properties:high strength,light weight,excellent thermal stability,wear resistance and corrosion resistance.Compared with traditional bearings,polymer materials can improve the wear resistance and corrosion resistance of bearings.Experiments show that as the size decreases,the mechanical properties of polymer materials show a strengthening trend with scale effects,and the traditional EHL theory cannot consider the effects of scale effects based on the classic elastic theory.Therefore,based on the Cosserat elastomer theory,this paper proposes an elastic fluid lubrication model considering the scale effect to study the lubrication performance of micro-scale sliding bearings,and iteratively solves the elastic deformation of the sliding bearings in the model through the Cosserat basic equations and the two-dimensional Reynolds equation And the pressure distribution of the lubricating film,using the proposed Cosserat elastic fluid lubrication model to study the effect of the microtexture design parameters of the polymer surface and the Cosserat theoretical characteristic length on the EHL performance.By analyzing the liquid film pressure distribution cloud map,liquid film thickness distribution cloud map,bearing capacity and friction loss power calculated by MATLAB software,the following conclusions are obtained:texture depth,texture diameter,texture distribution area size,etc.Big influence;when the texture depth is0.8?m,the bearing capacity is the largest and the friction loss power is the smallest;for the surface texture diameter,in the bearing entrance texture area,as the surface texture diameter increases,the sliding bearing's The bearing capacity continues to increase,and the friction loss power continues to decrease;for the surface texture distribution size,as the surface texture distribution size increases,the bearing capacity of the polymer sliding bearing increases first and then decreases,and there is an optimal surface texture The size of the texture distribution,when the surface texture diameter is 10?m,the optimal surface texture distribution area is 70?m×70?m;Cosserat characteristic length l_b has a great influence on the performance of polymer sliding bearings,and a slight change in the bending characteristic length l_b will cause load With a large change in capacity,the torsional characteristic length l_t has little effect on the performance of polymer sliding bearings.