Effects of surface texturing on the frictional behavior of cast iron surfaces

The purpose of this study is to investigate the effects of the geometry and distribution of microdimples on the frictional behavior of surfaces for applications in automotive engines. A square array of microscale circular dimples was selected as the texture pattern. A laser beam was used to create microdimples with various dimensions on cast iron surfaces. Frictional tests were performed with selected loads and speeds to simulate the operation conditions of automotive engine parts. The effects of dimple distribution were also investigated. The aspect ratio of the dimples was found to be the most significant factor, while the effect of the surface density of the dimples on the coefficient of friction was found to be only marginal.