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This paper describes the appearance of abnormal film thickness featuresformed in elastohydrodynamic contacts lubricated by a fatty alcohol.Experiments were conducted by varying the slide to roll ratio between a steelball and a glass disk in a ball-on-disk type device. Lauric alcohol was used aslubricant and film thickness was measured in the contact area by opticalinterferometry. Experimental results showed that the film thicknessdistributions under pure rolling conditions remained classical whereas the filmshape changed when the slide to roll ratio was increased. The thickness in thecentral contact area increased and in the same time inlet and exit filmthicknesses were modified. In addition, the film shapes observed when the ballsurface was moving faster than the disk one and those obtained in the oppositecase were different, i.e. when opposite signs but equal absolute values of theslide to roll ratio were applied.

Film Thickness Changes in EHD Sliding Contacts Lubricated by a Fatty Alcohol