Development of a rheological model of stress relaxation in the structure of an oil film on the friction surface with fullerene additives

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.235468

Keywords:

tribosystem, fullerene compositions, dynamic viscosity, structural viscosity, clusters, micelles, rheological model, stress relaxation, lubricant film, lubricants

Abstract

A rheological model of stress relaxation in a thin lubricant film, which is formed on the friction surface under the influence of the force field of the friction surface in the presence of fullerene compositions in lubricants, was developed. Analysis of the model made it possible to establish that the existence of elastic or viscous properties in surface structures depends on the ratio of two parameters. This is the time of stress relaxation in the structure on spots of actual contact and the duration of stress action on these spots, which is termed the lifetime of an actual contact spot.

It was shown that an increase in the sliding rate reduces the time of relaxation of stresses in the surface structure. This is due to the destruction of aggregates in the structure of gel and the appearance of rotational movements of separate units ‒ flocs. An increase in the load on the tribosystem significantly increases the value of relaxation time. This is due to squeezing the viscous component out of the structure of a surface film. It was established that if the relaxation time exceeds the duration of actions of stresses on actual contact spots, the structure of a surface film behaves like an elastic solid. Conversely, if relaxation time becomes shorter than the duration of stress action, the film behaves like a viscous medium.

Theoretically, it was shown that in the range of sliding and loading rates, when a film behaves like an elastic solid, a decrease in stresses on actual contact spots does not exceed the values of 1.1‒22.8 %. This property provides the bearing capacity of a film. The development of the model will make it possible to simulate elastic and viscous properties of "stitched" structures and substantiate the rational concentrations of additives to lubricants, as well as the ranges of their use.

Author Biographies

Andrii Kravtsov, Kharkiv Petro Vasylenko National Technical University of Agriculture

PhD, Associate Professor

Department of Transport Technologies and Logistics

Anastasiia Suska, Kharkiv Petro Vasylenko National Technical University of Agriculture

Doctor of Economic Sciences, Associate Professor, Head of Department

Department of Woodworking Technologies and System Engineering of the Forest Complex

Abliatif Biekirov, Ivan Kozhedub Kharkiv National Air Force University

PhD

Department of Aviation Engineering Support

Dmytro Levkin, Kharkiv Petro Vasylenko National Technical University of Agriculture

PhD, Associate Professor

Department of Higher Mathematics

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Published

2021-07-01

How to Cite

Kravtsov, A., Suska, A., Biekirov, A., & Levkin, D. (2021). Development of a rheological model of stress relaxation in the structure of an oil film on the friction surface with fullerene additives. Eastern-European Journal of Enterprise Technologies, 3(7 (111), 93–99. https://doi.org/10.15587/1729-4061.2021.235468

Issue

Vol. 3 No. 7 (111) (2021): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2021 Andrii Kravtsov, Anastasiia Suska, Abliatif Biekirov, Dmytro Levkin

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