Tribology Letters

, 66:74 | Cite as

Magnetic Levitation Tribometer: A Point-Contact Friction

  • A. A. Vasko
  • O. M. Braun
  • O. A. Marchenko
  • A. G. Naumovets
Original Paper
  • 29 Downloads

Abstract

We developed a new magnetic levitation tribometer (MLT) to study point-contact friction via pendulum method. The device allows us to carry out fast and accurate point-contact measurement of friction between a pair of materials. The MTL parameters were found with the help of test experiments with the steel ball / glass plate pair. The friction coefficient values are coherent with the results known in the literature (Serway and Beichner in Physics for scientists and engineers, 5th edn, Saunders College Publishing, Orlando, 2000). The proposed MLT technique at loads lower than \(10^{-3}\) N is very promising for non-destructive investigation of frictional properties of organic monolayers.

Keywords

Point-contact friction measurements Moment of inertia of pendulum Kinetic friction coefficient 

List of Symbols

\(\phi\)

Angle deflection of pendulum

\(I_0\)

Pendulum moment of inertia

\(K_0\)

Impact of the external magnetic eld without extra mass

\(\omega _0\)

Natural frequency without extra mass

\(\Delta m\)

Extra mass

l

Distance from the axis of pendulum to the center of extra mass

I

The total moment of inertia

K

Impact of the external magnetic field

\(\omega\)

Natural frequency

\(\gamma\)

The damping coefficient

M

The total moment of force without friction

N

Applied normal load

\(\mu _{k}\)

Velocity-dependent kinetic friction coefficient

\(\mu _{k0}\)

Velocity-independent kinetic friction coefficient

\(r_0\)

Contact radius

\(\Omega\)

Angular frequency

\(\psi\)

Dimensionless angle deflection of pendulum

\(\xi\)

Dimensionless damping coefficient

\(\tilde{\omega }\)

Dimensionless natural frequency

\(\tilde{\gamma }\)

Overall friction coefficient

\(M_f\)

The total moment of frictional force

\(\tau\)

Dimensionless time

Notes

Acknowledgements

The authors would like to thank A. Le Bot, J. Scheibert, and M. Sahli Riad for numerous helpful comments and discussions. This work was supported by CNRS-Ukraine PICS Grant No. 151539. O.B. was supported in part by COST Action MP1303.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of PhysicsNational Academy of Sciences of UkraineKievUkraine

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