Abstract
It is examined the suitability of the modeling of impact events using friction and restitution as independent Domenech-Carbo (Granul Matter 16:573–582, 2014), including a modified description of collisions occurring in stick regime. The rebound of coins on a steel bar grooved at the nanoscopic scale was used to test the model combining surfaces with different asperities. The surface topography was examined by scanning tunneling microscopy and atomic force microscopy whereas the asperity was evaluated in terms of the fractal dimension of the surface determined from electrochemical impedance spectroscopy measurements. Experimental data denote that asperity variations determine significant variations in the coefficient of friction with no concomitant variations in the coefficient of tangential restitution. The meaning of the independence of restitution and friction as an operational approximation for simple modeling of collisions is discussed.
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