This paper is focused on the real area of contact for paper-based wet friction materials during the engagement of wet clutches. The deformation of the wet friction material is identified as elastic during the engagement. A microcontact model is proposed considering both surface roughness and skewness. A Weibull density distribution is employed in the model rather than a Gaussian density distribution. This model is compared with the Greenwood-Williamson (GW) model for the cases of positive skewness, zero skewness and negative skewness. The real areas of contact of new, run-in and glazed wet friction materials were investigated using this microcontact model. Both surface roughness and skewness were found to have a great effect on the real area of contact.
Microcontact Model for Paper-Based Wet Friction Materials
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY . Manuscript received by the Tribology Division December 8, 2000; revised manuscript received June 12, 2001. Associate Editor: M. D. Bryant.
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Gao, H., and Barber, G. C. (June 12, 2001). "Microcontact Model for Paper-Based Wet Friction Materials ." ASME. J. Tribol. April 2002; 124(2): 414–419. https://doi.org/10.1115/1.1430674
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