Figure 2.

Typical 1000-cycle-average friction loops obtained with the tribometer of Figure 1 [19], at 27 °C and a relative humidity (RH) of 30%. The sliding speed was constant at 5 µm/s. Support position 0 μm is where the loop was started every cycle. This loop is an average over 1000 scans. The fact that the slips appear sharp means that there was no significant change to their position over these 1000 scans and hence no surface changes (which would indicate wear). [Reprinted with permission from van Spengen, W. M.; Frenken, J. W. M. Tribol. Lett. 2007, 28, 149–156.]