Abstract:Surface roughness has a significant impact on the runningin property of frictional pairs.To investigate the influence of initial surface roughness and surface texture on runningin property,the runningin test for the samples with five different surface roughness and with different dimple diameters surface texture was carried out under given condition.The results show that the runningin quality can be improved effectively through a combination of initial surface roughness and surface texture with the right size.With the increasing of initial surface roughness,the effects of surface texture on runningin property are starting to show gradually.Moreover the larger the initial surface roughness,the larger of the corresponding optimal dimple diameter of surface texture becomes.With the increasing of dimple diameter,the corresponding optimal initial surface roughness is increased gradually.Surface roughness and surface texture follow similar trends at changing,but have different optimal values when considering runningin time and friction coefficient,respectively.