A Comparison between 2d and 3d Surface Parameters for Evaluating the Quality of Surfaces

This paper presents a comparison of the results for roughness parameters obtained with the help of two methods of evaluating the quality of the finished surfaces: 2D profilometry and 3D profilometry. There were investigated square areas from finished steel rings and polymeric blocks, these elements being used for tests on a block-on-ring tribotester. There were calculated the average values of the 3D parameters characterizing three square areas on each part and the average values of nine 2D profiles extracted from the already investigated square areas. There were also discussed the scattering ranges for the roughness parameters as given by each of the two methods. When evaluating the worn surfaces, the parameters Ssk, Sku, Sy, Sp are Sv, are more relevant, as the high peaks affect the tribological parameters, especially when dealing with polymeric composites.