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The evaluation of the tribological conditions, among which the friction by means of simple models are questionable because the influence of superficial roughness and strength of materials, among other factors, is not considered. This paper presents a detailed analysis on the influence of surface roughness on friction at the specimen/die interface. The studies are based on experimental data obtained by the ring compression test, which they were compared with results of simulations and the calibration curves of friction modeled in finite element software. A series of ring compression tests was performed to obtain the friction coefficient for various ranges of surface roughness of the specimen. Key words: ring compression test, surface roughness, friction coefficient, numerical simulation.

Estudo do efeito da rugosidade superficial sobre o coeficiente de atrito no ensaio de compressão do anel