Normal load, slip rate and roughness influence on the polymethylmethacrylate dynamics of sliding. 1. Stable sliding to stick-slip transition

We present the results from an extensive study on (PMMA)-PMMA polymethylmethacrylate dry friction. For a wide range of normal pressures, slip rates and grades of roughness of sliding surfaces, we analysed the conditions in which steady and catastrophic sliding appear. For the grades of roughness and slip rates investigated, we observed a steady-state regime at low normal pressures and a stick-slip regime when the normal pressures were high. For intermediate normal pressures, the transition between the two regimes was controlled by the roughness and slip rates. In this last case, slip motion was steady at high slip rates for the range of grades of roughness considered, and at all slip rates for the roughest surfaces. In other conditions, we observed stick-slip. In the case of steady sliding, the dynamic coefficient of friction decreased linearly with the logarithm of increasing sliding velocity. Furthermore, this coefficient of friction and its variations with slip velocity were lower for smooth surfaces. For stick-slip motion, the static coefficient of friction was mostly influenced by normal pressure. For the three highest normal pressures, the static coefficient of friction decreased linearly when normal pressure increased. This coefficient was not influenced by slip rate and showed a slight increase when the roughness of the sliding surfaces increased.

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