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Lookup NU author(s): Dr Francis Franklin,
Professor Ajay Kapoor
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Small-scale devices operate in mild conditions of low nominal pressure and low local coefficient of friction, and the contacting surfaces are much smoother than those of normal engineering components. Under such conditions the role of adhesion becomes pronounced. In this work a new extended wear model is obtained by incorporating the effect of adhesion into the plastic ratchetting wear model of Kapoor et al. [Wear 212 (1997) 119-130]. The model describes the contact of a hard, isotropically rough surface with a wearing surface, contact being made at asperity summits. Such localised contacts lead to high pressures, which drive the plastic ratchetting. The presence of adhesion associates negative, i.e. adhesive, pressures with each contact; some asperities may have negative contact loads which act to pull the surfaces together. The load transmitted through the surfaces is thus the sum of the adhesive force and the applied external load. As the externally applied load is reduced to zero and becomes tensile, the load transmitted through the surfaces and the wear volume decrease to zero. As this happens the well known Archard wear coefficient, which varies inversely with the load, goes through a singularity.
Author(s): Kapoor A; Franklin FJ
Publication type: Article
Publication status: Published
Journal: Tribology Series: Thinning Films and Tribological Interfaces
Print publication date: 01/01/2000
ISSN (print): 1572-3364
Publisher: Elsevier B.V.
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