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Journal of Physical Studies 11(3), 268–278 (2007)
DOI: https://doi.org/10.30970/jps.11.268 PHASE DYNAMICS OF A THIN LUBRICANT FILM BETWEEN SOLID SURFACES AT THE DEFORMATIONAL DEFECT OF SHEAR MODULUSA. V. Khomenko, I. A. Lyashenko
Sumy State University |
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The effect of the deformational defect of shear modulus on melting of ultrathin lubricant film confined between atomically flat solid surfaces is investigated within the framework of Lorentz model for the description of viscoelastic medium. It is shown that both jump-like and continuous melting of lubricant can be realized. The three modes of lubricant behaviour are found which correspond to the zero shear stress and strain, the Hookean section of loading diagram and the section of plastic flow. The hysteresis of dependencies of the stationary stress both on the strain and on the temperature of rubbing surfaces is described. The phase kinetics of the system is studied in different coordinates. It is shown that the ratio of the relaxation times of investigated quantities influences qualitatively the character of setting of a stationary friction mode. The parameters of lubricant are found, at which the auto-oscillatory mode of stick-slip motion is observed that does not bring the system to a stationary state.
PACS number(s): 46.35.+z, 62.20.Fe, 62.20.Qp, 64.60.-i, 68.60.-p, 81.40.Pq, 83.85.St