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Additional resources for Friction Surface Phenomena
Surface State; Energy Characteristic 45 Phy sicochemical properties of the machined surface depend, to a great extent, on the above factors as shown experimentally. Therefore, in order to explain the obtained U, versus R, (see Fig. 3) and CPD kinetics after machining, the influence of microgeometry should be considered in connection with the surface physical state for a given roughness. In order to explain the features of relations between CPD and the surface machining quality, the theory of fatigue failure of materials [58-611, and the concepts on influence of the number, nature, and dynamics of defects contained in the surface metal layer on EWF are used.
A. Rehbinder in 1928. Properties of surface layers are characterized by the following thermodynamic parameters: free and total energies, chemical potential, and entropy. Besides, the mechanism of adsorptional reduction of strength is dictated by the nature of molecular forces (physical or molecular adsorption) active in the surfaces layers. According to modem views, the strength reduction in complete absence of volume diffusion and corrosion is associated with easier dislocation emergence on the surface of the deformed crystal as a result of reduced surface energy of the solid in the surfactant.
Naturally, such differences in copper after grinding from the other metals may be attributed to their different nature. It is apparent a definite relation exists between this feature and the ability of copper to ST. This problem will be discussed in detail a little later. As for copper alloys, the difference in ratios between the maxima can be attributed not only to the nature of the main component but also to the nature and the smear of alloying agents (see the curves for CuZn37 brass, copper and zinc, Fig.