As well recognized, a functional surface finish can determine how well the surface wears, transmits heat, and distributes a lubricant. Among the large number of surface parameters available to describe surface finish requirements, the arithmetic mean of surface roughness, Ra, is the most specified surface finish parameter across most industries and applications. However, Ra may not fully describe the functional requirement of the surface. This study is focused on the selection of surface parameters based on local contact pressure, an important indicator of friction and wear. Surface parameters are obtained from measured or generated three-dimensional topographies. Surface performance responses, evaluated by local contact pressures, are calculated from micro-contact analysis based on the rough surfaces. The analysis of correlation, indicated by Pearson correlation coefficient that is a measure of correlation strength of linear relationship, is performed among these surface parameters and between surface parameters and responses. A set of functional parameters is identified to properly specify a surface evaluated by local contact pressure.

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