By Ivan Iliuc
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This layer may be renewed during operation ; a, - layers formed on the surfaces of the friction pair before they begin to operate. This layer is not renewed during operation. (b) participation of the material of the friction pair: b, - the surface material participates in the formation of the layer; b, - the surface material does not participate in the formation of the layer. g. adhesion diffusion, possibly) ; (d) thickness of the layer: c/l - monomolecular layer (thickness : one molecule); d2 - polymolecular layer (thickness: several molecular layers); dJ - massive layer (thickness of several tenths of a millimeter).
E. 16) according to the value of the parameter L, assumingthat the total heat passes into solid C. 16), it is necessary to know the real area of surface contact between the solids. Lack of precision in defining the real area of contact also affects the value of the surface temperature. The lack of precision increases with dry friction between metals, because an oxide layer is present. 5 Q or for very high speeds ( L > 100) when Qc = Q. 19) 36 where is yield pressure in hardness tests, P - load, J - conversion constant, g - acceleration due to gravity, p - coefficient of friction.
The 0, temperature is considered in comparison with an internal point of the solid well removed from the surface; the temperature of the solid is considered to be zero. 2 Pointlike heat source. If it is assumed that the heat distributed in the two solids is known. the temperature of solid B from a motionless source may be written by analogy with the constriction resistance [84] where Q B is power of the heat source for solid B, ,IB - thermal conductivity of solid B, a - contact radius. 13) are no longer valid, the value L=-, Va 2% is introduced, where X = I / p c is the thermal diffusivity.