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The analysis of the forces which lead to metallic adhesion phenomena may be categorized arbitrarily into four sub-groups: interfacial, solution, electronic, and fracture which are based on a particular model of the interface between the interacting systems. Since the conclusions of each of these analyses are based on a theoretical study rather than on the interpretation of an extensive array of experimental data from adhesion experiments, each model must be examined in order to ascertain whether or not the available information as well as the predicted behavior of real systems are consistent with the particular model. The interfacial energy and van der Waals models, for example, were derived originally for non-metallic systems; and, as a consequence, the field effects of collective electron transfer and magnetic interaction have been neglected in the attractive force determination. The purpose of this paper was to present some of the other considerations that must be acknowledged before a particular model is acceptable for the application to metallic adhesion data.
Keller, D. V.