A hybrid, non-dimensional parameter descriptive of the plowing nature of surfaces is proposed for the case of sliding between a soft and a relatively hard metallic pair which are nominally flat, typically as one encounters in the case of hot forming. From a set of potential parameters which can be descriptive of the phenomenon, dimensionless groups are formulated and the influence of each one of them analyzed. Inter- dependence between certain groups are established which lead to retention of those which are independent. A non-dimensional parameter involving the root-mean square deviation (Rq) and the centroidal frequency (Fmean) deducted from the power-spectrum is found to have a high degree of correlation (as high as 0.93) with the coefficient of friction obtained in sliding experiments under lubricated condition. Variation of the coefficient of friction in dry condition (which brings in the effect of adhesion, in addition to plowing) as a function of the proposed parameter is also presented.
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