By A. D. Sarkar and J. Halling (Auth.)
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Extra resources for Wear of Metals
Example text
1 has been shown to be the same in actual machine parts and there is due emphasis on the importance of running-in before a sliding component takes up its full load during its life of operation. Surfaces under counterformal contact, for example a hemispherical pin on a bush, create a situation where the load is concentrated on a parallel narrow band of highly stressed metalJ The soft member of the couple will flow plastically and the area of contact will grow into an equilibrium size commensurate with the applied load.
The film is, possibly, removed by simple ploughing by a hard asperity or its detachment from the substrate may be explained by the work of adhesion concept (chapter 5 ) . 1 The 3 Term. e. 6) The full equation of wear can be written as V 5 A0 exp(-E/RT)dM 2 P 21 y where the symbols have the same meaning as in chapter 8. 7. Since the volume rate of wear per unit sliding distance is directly governed by 3, a high value of this means an increase in the rate of wear and vice versa. 6 can be regarded, for all practical purposes, as the diameter of the contact area if it is circular and is probably decided by the normal stress.
In a typical tribological situation, the contact time between two WEAR OF METALS 36 sets of interacting asperities is small and, hence, the kinetic friction should always be lower than the static component which is the force necessary to initiate sliding between two initially stationary surfaces. An increased strength of a static interface under load with time is attributed to a process analogous to creep when the junctions grow in all directions. Static -►Sliding distance Fig. 2 Schematic representation of static and kinetic friction between two surfaces with the onset of sliding.