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Power dissipated by friction, slip rate: 1%, RH = 50%. A region is defined when the variations of the measured quantities are decreasing, constant, or increasing. The slopes plotted in this Figure define an inflection point between regions #1 and #5. Pictures of the surfaces of the disc were taken at the instants a) to d) and can be seen in Figure 21. The point a) corresponds to the minimum of adhesion reached, and points b) and c) allow the surface of the disc to be checked before and after reaching a maximum of adhesion. Point c) allows the surface of the disc used to be checked when all of the mechanical quantities are stabilized.
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