Abstract
Contact of two rough surfaces at an interface occurs at a small fraction of the nominal area. The real area of contact and interfacial adhesion primarily control the friction of an interface. With the presence of a thin film of liquid lubricant or adsorbed water layer at the interface, menisci form around the contacting and near-contacting asperities. The meniscus formation results in stiction problems in the head–medium interfaces. The objective of this research is to predict optimum surface roughness for minimum friction/stiction. For the first time, the effects of skewness and kurtosis of surfaces with non-Gaussian distribution on contact area and meniscus contribution have been studied. A numerical model that accounts for the effects of roughness distribution and liquid film was used for this study. Based on this study, a surface with non-Gaussian distribution with positive skewness between 0 and 0.2 and/or with high values of kurtosis (K≥5) should be used for low friction and stiction.
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