Abstract:To investigate the influence of surface roughness and thermal effect on nonNewtonian mixed lubrication,based on the average flow model,considering the surface roughness and thermal effect,a nonNewtonian mixed lubrication model of line contact was established.The effects of surface roughness on the film thickness,the film thickness ratio,the average friction coefficient,the load ratio and the temperature distribution were studied,and the thermal and isothermal solution was compared.The results show that,with the increase of surface roughness,the temperature of oil film is increased gradually,especially in the exit and entrance areas,and the higher the oil film temperature rise,the larger the load ratio and the average friction coefficient,the smaller the film thickness ratio.Compared with the isothermal solution,the film thickness ratio and the average friction coefficient of thermal solution are smaller,and the load ratio is greater.The difference of variation in the central and minimum film thickness versus the surface roughness between the isothermal and thermal conditions is significant.Therefore,thermal effect in mixed lubrication can not be neglected.