Abstract

The Third Body Concept is a very useful tool for simplifying and unifying the identification of tribo-logical system. In its initial formulation by Godet, it was implied that the system could be defined like a hydro-dynamic system, with the number and behavior of the constituents being initially specified. Then the interfacial interactions are identified to allow velocity accommodation within the system. In a variety of sliding systems, though, the friction behavior of the system changes in time in a way that is hard to predict with normal third body models. This paper will discuss several cases in which either the interfacial conditions or the behavior of the first or third bodies varies during sliding. Those changes in behavior could be included in an expanded third body concept which includes various velocity accomodation mechanisms within the model.

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