By Martin C. Windrow
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Extra resources for Aircraft Profile No. 23: The Messerschmitt Bf 110
Shear strength gradient. Surface sliding requires the localization of all processes of interaction and rupture in a thin surface layer, whose shear strength must be less than the shear strength of the substrate. 6. Formation of a third peíase during sliding. The necessity for fulfilment of the gradient rule of shear strength requires, if surface sliding is to occur, the formation of a weakened surface layer of base naterial or the formation of films on the sliding surface vdiich have a lower shear strength than the base.
39 Interaction, Changes, and Damage to Solids Special Features in the Rupture of a Sliding Surface The tendency of a sliding pair, under constant external conditions, to show changes in surface roughness, viiich lead to the minimum wear, coefficient of friction, and heat evolution, is an indirect confirmation of the fact that at each of the frictional bonds formed conditions are realized v^iich correspond to the minimum values of the above three characteristics. A minimum wear will be obtained with elastic contact of the contacting asperities (in this case the coefficient of friction and the heat evolution will be a minimum).
5 h at the lower pressure; v^en the pressure is raised to 10"^ mnfig the time is decreased to 1 s. A diamond cylinder was reciprocated at a rate of 2 s per reciprocation at an aitplitude of 2 mm, and the results are shown in Fig. 25. At a residual pressure of 10""^° mroHg the adsorbed film was conpletely worn after 500 cycles. At a residual pressure of 10~® mnriHg the film had time to be partially restored, so that the coefficient of friction slowly increased over the long time period. 25 χ 10"^.
Aircraft Profile No. 23: The Messerschmitt Bf 110 by Martin C. Windrow