Figures & data
Table 1. Characteristics of lubricating greases studied.
Figure 1. (a) In-house-made grease mixer (reproduced from Cyriac, et al. Citation(2)) (b) Bearing startup torque measurement setup (reproduced from Cyriac, et al. Citation(10)).
Figure 2. AFM images obtained for water-contaminated and uncontaminated grease samples with thickener particle dimensions.
Table 2. Test conditions employed for preshearing the grease samples.
Figure 3. (a) Oscillatory strain response of CaS/MS grease with 0% (unfilled symbol) and 10% water (filled symbol) at −25°C and (b) yield stress from oscillatory strain sweep for a representative grease at 1 Hz.
Figure 4. Yield stress from oscillatory strain sweep for water-contaminated and uncontaminated grease samples. The breakpoint is shown as the intersection of straight lines. For clarity, only one fitting curve is shown in the plot.
Table 3. Breakpoint temperature from yield stress and starting torque plots (values in parentheses) for water-contaminated and uncontaminated greases.
Table 4. Fitting parameter obtained from yield stress and starting torque plots (values in parentheses) using Eq. [Equation1
[1] ] for water-contaminated and uncontaminated greases.
Figure 5. Torque versus time at −18.75°C for (a) PU/E grease with 0 and 80% water and (b) CaS/M grease with 0 and 10% water.
Figure 6. Startup torque versus temperature for the greases with and without water. The breakpoint is given as the intersection of two straight lines. For clarity, only a few fitting curves are shown.
