Synergetics and Fractals in Tribology

Janahmadov, A.Kh.; Javadov, Maksim

doi:10.1007/978-3-319-28189-6

Cited by 20 publications

(6 citation statements)

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“…The flow of significant currents through the power sliding contact leads to EDM processes in them, and they are completely identical to similar processes in switching contacts [4,16]. Electrical and mechanical processes affect each other, which can both increase the intensity of wear and weaken it, i.e., there is a synergistic effect [4,9].…”

Section: Analysis Of Literature Sourcesmentioning

confidence: 99%

The Use of Innovative Contact Strip for Pantographs of Electric Rolling Stock. Experience in Operational and Bench Tests

et al. 2021

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Modern high-tech composite materials are widely used in various sectors of the economy, in particular, in railway transport. Among the areas of application of such innovative materials, the manufacturing of contact strips for pantographs of electric rolling stock should be mentioned. Innovation is primarily understood as the self-lubricating property of the working surface of the linings. The linings made of such materials differ from the traditional graphite (coal) ones by the increased content of metal additives, in particular copper, which limits the possibility of their use on electric rolling stock in the countries of the European Union. Regulatory restrictions on the content of copper (35% and 40%) are associated with possible damage to the contact wire, in the case of using overlays with a content of copper (metals) greater than these restrictions. On the railways of Ukraine (countries of the former USSR), there are also restrictions on the use of linings of different types according to the degree of wear of the contact wire, no more than 40 microns is allowed per 10 thousand passes of the locomotive pantograph along the contact wire. These standards are verified during operational and bench tests. The aim of the article is to present the types of tests and compare the obtained values with similar indicators in the case of using a traditional contact strip for pantographs of electric rolling stock. The results obtained confirm the possibility of using innovative linings on iron networks, since the wear of the contact wire during testing is much lower than that of the normative and knife than for traditional types of linings. In addition, during a set of tests, the fact of improving the quality of the working surface of the contact wire was established, which positively affects the extension of the service life of the contact wire.

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Section: Analysis Of Literature Sourcesmentioning

confidence: 99%

The Use of Innovative Contact Strip for Pantographs of Electric Rolling Stock. Experience in Operational and Bench Tests

et al. 2021

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“…But it is difficult to use the value of current density to predict the contact wear rate due to the diversity of current factors and the complex nature of their interaction with each other. Among the main factors of wear in the absence of electric sparking and arcing: oxidation of the metal element of a friction pair; oxidation of the composite element of a friction pair and weakening of its strength; increase in adhesion due to dissociation of water films or organic substances under the action of electric current; the occurrence of shock thermal stresses in dynamic contact through the uneven distribution of current density in it, a high coefficient of friction in the contact zone [8,9,10]. All factors can act simultaneously and their main cause is heat dissipation on the transitional contact resistance.…”

Section: Main Partmentioning

confidence: 99%

Nanostructures in the Formation of the Properties of High-Current Sliding Electrical Contacts on the Electric Rolling Stock

Ustymenko

Мukhа

Baliichuk

et al. 2019

2019 IEEE 39th International Conference on Electronics and Nanotechnology (ELNANO)

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The paper presents the results of bench tests of wear resistance of contact inserts of current collector runners made of «ROMANIT-UVLSh» material and their effect on the wear of the copper contact wire is evaluated. This material is a composite with a high content of electrically conductive lubricants capable of forming a thin conductive transition layer in a friction pair. Low temperature in the contact zone, indirectly, indicates a low transition resistance and high energy performance of the sliding contact, and low wear of the contact wire confirms its high tribological and mechanical properties. The use of contact inserts runner's current collectors made from this material is possible, both in alternating and direct current and can provide higher technical and economic indicators in comparison with traditional materials.

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“…As design science moves into the twenty-first century, a comprehensive understanding of friction has arisen, and friction is anticipated to be taken into account while improving and designing various machine units. Fractals can be found in a wide range of materials, including crystal development, fracture theory, thin coatings, and porous materials, to name a few (Mandelbrot, 1977;Bai-Lian, 2002;Park et al, 2010;Wang et al, 2015;Janahmadov et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A Review on Treating Tribological Problems with Fractals

Lăpuşteanu

Paleu

2022

Bulletin of the Polytechnic Institute of Iași. Machine Constructions Section

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Fractals and chaos theory provide means of modeling dynamic changes in micro and nano topography on friction surfaces caused by various tribological mechanisms and processes. Friction and wear phenomena in tribological systems can be interpreted on a macroscopic scale. With the development of miniaturized scale and nanoscale systems, it has been launched the hypothesis that macro-level systems cannot reflect the microscale and nanoscale phenomena. A conclusive case is given by the calculation of frictional torque in microscale orientation, in this situation being found that models created by bearing producers cannot validate experimental results. By applying the “box-counting” method, it is possible to estimate the fractal dimension both directly and indirectly by comparing the area-perimeter-scale relations. Based on scaling equations, a system was created for this operation. The conclusion is that all existing theories in tribology should be adapted to take into account fractal size and fractal roughness.

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Synergetics and Fractals in Tribology

Cited by 20 publications

References 0 publications

The Use of Innovative Contact Strip for Pantographs of Electric Rolling Stock. Experience in Operational and Bench Tests

The Use of Innovative Contact Strip for Pantographs of Electric Rolling Stock. Experience in Operational and Bench Tests

Nanostructures in the Formation of the Properties of High-Current Sliding Electrical Contacts on the Electric Rolling Stock

A Review on Treating Tribological Problems with Fractals

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