Magnetic Levitation Tribometer: A Point-Contact Friction

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

“…Furthermore, the negative slope of ω(a) proves that ν < 0. Note that a similar, affine-like behaviour of ω(a) had already been obtained, for the same tribometer, on a steel/glass contact [13], suggesting that a similar quadratic elastic force was also important in that case.…”

“…On the one hand, nonlin-ear dissipative forces have been identified and measured [12]. On the other hand, a progressive shift of the oscillation frequency has been observed with a rotational tribometer [13]. Both observations confirm that tribological interfaces are complex [14] and thus cannot be fully described with a simple combination of viscous and friction coefficients.…”

“…Note that relaxation tribometry, in essence, probes the transient (as opposed to steady sliding) response of a frictional interface over the characteristic time scale of the oscillator's period. Two types of tribometer have been reported in the literature [8,13] depending on the kinematics followed by the rubbing sample: translation or torsion (see Fig. 1).…”

“…We illustrate here the method presented above on the example of a measurement performed with the torsional magnetic levitation tribometer described in [13]. The natural moment of inertia of the pendulum is I 0 = 1.24 kg•mm 2 .…”

Investigation of tribological properties of nanostructured objects on atomic-smooth surfaces

“…розмірний коефіцієнт згасання; γ -загальний коефіцієнт тертя; ωбезрозмірна власна частота коливань; Ω -кутова частота; τ -безрозмірний час. У нашій попередній роботі [7] було показано, що вираз μ k0 виведено з рівняння (2) шляхом його узагальнення на повний період коливань:…”