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extracted from both partial-unloading and multiple single-loading tests are compared in Figure 4.7. Figure 4.7(a) shows the load-displacement curves of multiple single-loading indentation experiments on PTFE/Pyrrolidone-2 with varying maximum loads from 30 mN to 200 mN. In the figure, only two indentations for each maximum load were plotted for better observation (instead of the total six measurements that were performed for each maximum load). Figure 4.7(b) shows the load-displacement curve of one cycle partial- unloading indentation on the same coating surface (note that only one cycle profile out of five actual measurements was included in Figure 4.7(b) for clarity). The main difference between these two tests is that for the single-loading case, each loading-unloading cycle was performed at a different location of the coating surface, whereas, for the partial- unloading case, all the successive loading-unloading measurements were performed at the same location, thus resulting in only one indentation impression on the surface, compared to many impressions in the single-loading case. The extracted reduced modulus values calculated from both methods were plotted in Figure 4.7(c), and the hardness values in Figure 4.7(d). Compared to the in-situ load-displacement plots (raw data) that are plotted versus displacement in Figure 4.7(a) and 4.7(b), the reduced modulus and hardness values are plotted with respect to the contact depth (hc) of which property values are extracted as a function. In the single-loading case, the six modulus values calculated under the same maximum load were averaged, showing the standard deviation of the contact depth and modulus values in the x- and y-axes, respectively. In the partial-unloading case, all the values from the five cycles of partial-unloading were plotted without any averaging (as indicated by the five different colors for the partial- unloading data in Figure 4.7(c) and 4.7(d)). Although it was observed that partial- 61PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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