Abstract
We generalize a model for friction at a sliding interface involving the motion of misfit dislocations to include the effect of thermally activated transitions across barriers. We obtain a comparatively simple form with the absolute zero-temperature Peierls barrier replaced by an effective Peierls barrier which varies exponentially with temperature, in agreement with recent experimental observations of thermally activated friction. Going further, we suggest a plausible method for generalizing the frictional drag at a more constitutive level by replacing the Peierls stress in a more general sense where the microstructure (e.g., dislocation density, grain size etc.) is built in. Last, but not least, we point out that when barriers are included the static coefficient of friction becomes larger than the dynamic coefficient of friction, which is an important connection to reality.
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Acknowledgment
The authors would like to thank the U.S. Air Force Office of Scientific Research for funding this study on Grant number FA9550-08-1-0016.
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Liao, Y., Marks, L.D. Modeling of Thermal-Assisted Dislocation Friction. Tribol Lett 37, 283–288 (2010). https://doi.org/10.1007/s11249-009-9520-9
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DOI: https://doi.org/10.1007/s11249-009-9520-9