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Pre-sliding behaviour of single asperity contact

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Author: Yaqoob, M.A. · Winogrodzka, A. · Fischer, H.R. · Gelinck, E.R.M. · Rooij, M.B. de · Schipper, D.J.
Type:article
Date:2013
Source:Tribology Letters, 3, 49, 553-562
Identifier: 488291
doi: doi:10.1007/s11249-012-0096-4
Keywords: Materials · Mindlin's theory · Preliminary displacement · Shear stress · Single asperity contact · Static friction force · Stickslip area · Industrial Innovation · Mechatronics, Mechanics & Materials · MIP - Materials for Integrated Products · TS - Technical Sciences

Abstract

The pre-sliding and static friction force behaviour at asperity level between a smooth ball and a smooth flat surface at different normal loads, as well as friction behaviour during full slip has been studied. The normal load dependence of the friction force and the preliminary displacement is discussed when the mean contact pressure is kept under 100 MPa. The theoretical model to calculate the shear stress and the preliminary displacement in the contact is discussed and the experimental data were used to verify the model. The results show that for low applied normal loads the adhesion force has an influence on the friction force measurements. Furthermore, the results for the friction force and preliminary displacement show good agreement with the theoretical trends. The experiments along with the model can be used to analyse the tangential traction in the contact and the behaviour of the stickslip area. The measurement results along with the model were used to calculate the maximum shear stress at the point of sliding for different applied normal loads. It is also shown that at low applied normal loads the shear stress is not constant as compared to relatively high applied normal loads due to the presence of adhesion force. © Springer Science+Business Media New York 2013.