The effect of filtering processes on surface roughness parameters and their correlation with the measured friction, Part I: quarry tiles

It is known that surface roughness affects friction, but it is unclear whic h surface characteristics are better correlated with friction. Moreover, th e filter process used in surface roughness measurement affects the values o f surface parameters and, therefore, affects surface representations. The e ffect of filter selection on the surface parameters and their correlation w ith the measured friction was investigated in this study. Surface roughness on unglazed quarry tiles was measured. Friction was measured with two comm ercially available slipmeters. The results indicated that some parameters, such as R-sk, were significantly affected by the filter type, while some ot her parameters, such as Delta(a), were significantly affected by the band w idth. The filter type 2CR PC could generate surface parameters that had sli ghtly higher linear correlation coefficients with friction than two other f ilter types, ISO 2CR and Gaussian, and the filter band width of 1000 is not recommended. The surface parameter R-pk had a very high correlation with f riction, but it was highly location dependent and somewhat ambiguous in how it was generated. The surface parameter R-pm had a very small location dep endence and a very high correlation coefficient. Therefore, the surface par ameter R-pm was a better choice for an indicator of surface friction. (C) 2 000 Elsevier Science Ltd. All rights reserved.