Effect of Interfacial Properties on EHL Under Pure Sliding Conditions

The effect of boundary slip on elastohydrodynamic lubrication

“…4b and Fig. 4d), there is nearly no stretching of the photobleached volume and the back of the 25 volume moves dramatically. This suggests that significant slip takes place at the PB-Fusso interface at high pressure.…”

“…Wide-field correction was performed to account for the inhomogeneity of the excitation beam. A calibration curve was 25 generated by acquiring a fluorescence image of the Nile Red doped PB in a stationary point contact in order to obtain the correct lubricant film thickness. The corrected calibration image taken at a pressure of 260 MPa is shown in Fig.…”

“…A cubic polynomial was chosen and the coefficients of the polynomial were determined and used in the velocity profile reconstruction scheme, as simulations based on experimental conditions showed 25 that this order was sufficient for accurately determining slip velocities within 10 %. …”

“…16 To master this potential, it is necessary to directly correlate interfacial slip with friction and lubricant film thickness, with the latter being crucial to the protection of rubbing surfaces. This requires direct measurements of slip in 25 steady conditions. This can be achieved using photobleachedfluorescence imaging velocimetry.…”

“…Previous results have shown that the difference between results acquired for glass sphere and glass disc rotation is minimal. 25 Measurements were performed for plain spheres and Fusso 55 coated spheres at various loads and velocities. Lubricant was deposited on the glass disc.…”