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Tribology Letters

, 67:53 | Cite as

Relaxation Tribometry: A Generic Method to Identify the Nature of Contact Forces

  • Alain Le BotEmail author
  • Julien Scheibert
  • Artem A. Vasko
  • Oleg M. Braun
Original Paper
  • 33 Downloads

Abstract

Recent years have witnessed the development of so-called relaxation tribometers, the free oscillation of which is altered by the presence of frictional stresses within the contact. So far, analysis of such oscillations has been restricted to the shape of their decaying envelope, to identify in particular solid or viscous friction components. Here, we present a more general expression of the forces possibly acting within the contact, and retain six possible, physically relevant terms. Two of them, which had never been proposed in the context of relaxation tribometry, only affect the oscillation frequency, not the amplitude of the signal. We demonstrate that each of those six terms has a unique signature in the time-evolution of the oscillation, which allows efficient identification of their respective weights in any experimental signal. We illustrate our methodology on a PDMS sphere/glass plate torsional contact.

Keywords

Relaxation tribometer Damped oscillations Amplitude decay curve Frequency shift Nonlinear contact forces Two-times averaging method 

Notes

Acknowledgements

We thank J. Perret-Liaudet, E. Rigaud, and O.A. Marchenko for fruitful discussions and critical comments. This work was supported by CNRS-Ukraine PICS Grant No. 7422.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Alain Le Bot
    • 1
    Email author
  • Julien Scheibert
    • 1
  • Artem A. Vasko
    • 2
  • Oleg M. Braun
    • 2
  1. 1.Laboratory of Tribology and Dynamics of Systems, CNRS UMR 5513, Ecole Centrale de LyonUniversity of Lyon,EcullyFrance
  2. 2.Institute of Physics, National Academy of Sciences of UkraineKievUkraine

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