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Dry Sliding Friction Experiments at Elevated Velocities
Author(s) -
Lodygowski A.,
Faure L.,
Voyiadjis G. Z.,
Philippon S.
Publication year - 2011
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2010.00785.x
Subject(s) - tribometer , strain gauge , materials science , wheatstone bridge , sensitivity (control systems) , calibration , normal force , dynamometer , surface roughness , surface finish , stylus , oscilloscope , mechanics , work (physics) , acoustics , tribology , mechanical engineering , engineering , composite material , electrical engineering , voltage , physics , electronic engineering , quantum mechanics , resistor
An enhancement of an existing tribometer device developed by Philippon et al. (2004, Wear 257 , 777–784) is presented in this work. This experimental device is made up of a dynamometer ring and a specific load sensor allowing to apply an apparent normal force on specimens and to measure frictional forces respectively. Problems such as static calibration of both distinct parts supported by conducted numerical simulations is given and described in detail. Further discussion, again supported by numerical analysis, validates the placing of the strain gauges and explains the problems of sensitivity of loading surface and cross‐sensitivity. The entire experimental setup is then discussed explaining the mounting of the strain gauges located on the tribometer device, showing the configuration of the Wheatstone quarter‐bridges, presenting the signal conditioning amplifier system and the digital oscilloscopes which all together create one uniform data acquisition system. The set up is adapted on a gas gun to carry the Steel 1080 on Steel VascoMax 300 experiments. The main set of experiments with sliding velocities varying from 10 to 60 m s −1 are performed in the same tested setup. The recordings of normal and tangential forces leading to the friction coefficient determination are discussed. The values of dry friction coefficient μ according to the experimental parameters are in good agreement with those observed in the literature. Using this new configuration, the effects of the sliding velocity on the surface roughness changes and on the dry fiction coefficient are also investigated. Moreover, very interesting relations between wear and sliding velocity are observed.