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A large class of tribological contacts involve two components, each carrying finite roughness, sliding over one another for many repeated cycles of operation. Although the initial contact may be plastic the steady state situation is one of elastic stress fields in each consistent with the presence of a low shear strength boundary film on one or both of the surfaces. In order to relate the overall...
Conventional boundary films are thought of as ``solid'' layers in which shear strength is directly proportional to local contact pressure. However, recent studies suggest both that the properties of adsorbed or deposited surface films may be much more com- plex than this and that the details of surface topography cannot be ignored in determining the overall coefficient of friction of real engineering...
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