Abstract
Abstract A film image mapping technique, based on ultrathin film interferometry, has been used to study the lubrication of elastohydrodynamic (EHD) contacts with rough surfaces. A very small chromium ridge has been sputtered onto a steel ball and the EHD film thickness mapped for different rolling speeds and orientation of the ridge. The results show that the effect of the ridge on film thickness is local and does not affect other positions in the contact. The ridge showed the effect of increasing the mean EHD film thickness when oriented both transverse and at 60° to the rolling direction. Under static loads the ridge is almost completely flattened but as the rolling speed increases the surface tends to lift off and the deformed ridge recovers towards its original form. The deformed ridge height in the contact has been estimated for different operating conditions and compared to existing numerical models.
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