Effects of Sliding Speed

Sliding speed (m/s) Wear life (mins) Wear life (m) 

Test conditions burnished film, conformal contact,  

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Sliding speed was changed to study the effect of sliding speed on fiiction. Sliding spe were 5, 10, 20,40, and 80 mm/s. 

Figure 6 shows the effect of sliding speed on fiictiom Coefficients of start-up friction and dynamic friction increase with an increase of sliding velocity. 

The effect of sliding speed on the wear rate can be seen from Fig. 6.6b [22], The variation of wear rate of Nimonic 80A against Stellite 6 as a function of temperature at three different sliding speeds is described in this figure. The wear rate is minimum at an intermediate temperature at all three... 

In a different set of tests, medium-speed thrust washer sliding was done on Ti-6A1-4V. ty pe 6061-T6 Al, X-750, type 316 stainless steel, and X-750 samples coated with either a friable or a bonded commercial M0S2 coating. Tests were performed using ramped rotation speed, to assess friction as a function of sliding speed ramped load, to assess friction as a function of load or different atmospheres, to assess the effect of ambient gas on friction. Variable tests were ramped up and down, often more than once, to ascertain the reproducibility of the data. Sliding was stopped during... 

Fig. 29—Effect of van der Waals force on loading capacity of a O type slider under different pitch angles. Input parameter was set as minimum film thickness ho=6 nm, roll angle =0, sliding speed u=25 m/s, length of the slider L=. 2S mm, width of the slider B = 1.1 mm, mass of the slider M=1.6 mg.

The coefficient of friction increases with increasing sliding speed up to about 150 ft/min, while beyond this point, the sliding speed has very little effect. Polytetrafluoroethylene filled with molybdenum disulfide has a coefficient of friction lower than for pure polymer under the same conditions. The decrease is attributed to the increased hardness of the... 

The effective temperatures in the sliding contact will of course, be significantly affected by frictional heating and therefore by sliding speed and load, but the important conclusion is that the increase in friction with rising temperature occurs at a temperature at least 100°C higher with tungsten disulphide than with molybdenum disulphide. 

Figure 4. Schematic of the effect of viscosity and sliding speed on hydrodynamic friction. W is the normal load (44).

Fig. 8-16 shows the effect of a moderate range of slow sliding speeds on the coefficient of friction for hardened alloy cast iron lubri-... 

Figure 15-23. Effect of surface temperature on the additive action of dissolved sulfur in n-hexadecane, concentration as indicated, sliding speed 47.1 cm/s. Load o 1 kg. 2kg. A3kg. D4 kg. Copper on steel. Data by Nakayama and Sakurai [15].

Figure 19-5. Effect of load and sliding speed on the lubricating action of molybdenum disulfide. From data by Haltner and Oliver [36].

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