An energy-based model for the wear of UHMWPE |
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Authors: | R Colaço MP Gispert AP Serro B Saramago |
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Affiliation: | (1) Departamento de Engenharia de Materiais, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;(2) Centro de Química Estrutural, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;(3) Instituto Superior de Ciências da Saúde Egas Moniz, Quinta da Granja, Monte da Caparica, 2829-511 Caparica, Portugal |
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Abstract: | An energetic approach to model the wear of tribological systems in which one of the components of the pair is polymeric is
presented in this work. Experimental data, obtained in ultra-high molecular weight polyethylene (UHMWPE) pin-on-disk tribological
tests, showed that a linear correlation between the wear rate of the polymer and the dissipated energy exists, independently
of the lubricant, of the material used as counterbody and of the surface finishing of both polymer and counterbody. This fact
strongly suggests that, in UHMWPE-based tribological systems, energy dissipation is mainly caused by the elasto-plastic deformation
and wear of the polymer. Based on this assumption, it is developed a mathematical model that yields for a physical interpretation
of the parameters of the experimental wear vs. energy correlation. These parameters are intrinsic wear properties of the polymer
and can be used for the optimization of polymer-based tribological systems. |
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Keywords: | wear energy dissipation friction UHMWPE |
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