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Abstract
It has often been reported that the normal load dependency of the coefficient of friction under boundary lubrication is observed and that Amontons' low of friction is not realized. The mechanism by which such a property arises in friction has not been clarified sufficiently. Thus, the authors investigate the mechanism by which the normal load dependency arises using a simple boundary lubrication model. In this model, the configuration and distribution pattern of small asperities on the contact surface and the property of the lubricant are considered. Some friction characteristics under boundary lubrication are discussed.