Friction of mtl-metal surfaces

Tikhomirov, V. K.; Izmerov, Mikhail; Кузнецов, С. В.; Gornostaeva, Anna

doi:10.30987/2223-4608-2022-3-40-48

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Анализ приведенных выше соотношений показал [3], что коэффициент трения практически не зависит от нормальной нагрузки. Однако экспериментальные данные показывают, что существуют отклонения в оценке трения, когда область контакта изменяется от микро-до нано-масштаба.…”

Section: трение шероховатых поверхностейunclassified

Contact model and evaluation of friction force molecular component

Tikhomirov

Shalygin

Izmerov

2023

Science Intensive Technologies in Mechanical Engineering

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According to the level of the measurement scale, the friction force changes its nature and is determined by different depend-encies. The paper views a procedure for determining a friction force molecular component based on the evaluation of specif-ic shearing resistance of molecular links un-der the elastic interaction of a silicon nitride cantilever needle having a steel sample, used for scanning a section of a sample surface in the nanometer range with an atomic force microscope (AFM) «FemtoScan» under low loads. A sensitive element (measuring device) of an atomic force microscope acts as a force sensor for measuring both: a normal load very roughly, and a change in the force, applied to the cantilever under known stiffness, including the value of the cantilever rod form alteration. It also changes the load on the sensitive element (to assess the mo-lecular component of the friction force, the route of the «smoothest» surface itself was chosen). The paper also provides an analytical assessment of the contact interaction parameters of a cantilever needle in a nano-scale, rep-resented as a spheri-cal indenter, with an elastic half-space as a surface under study, based on the Hertz theory. Analysis of the calculation and experiment data on measuring the resistance force of the indenter during scanning of the surface under study, showed good convergence of the results with a deviation of even values from the experimental data of no more than 7,5 %. Calculations using the established formulas showed that with an increase in the load on the contact at the nanoscale, the coefficient of friction decreases due to a faster growth of contact spots in the elastic state (provided that angularity of inequalities related to sub-roughness remains constant), which was also confirmed in the course of the experiment.

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Section: трение шероховатых поверхностейunclassified

Contact model and evaluation of friction force molecular component

Tikhomirov

Shalygin

Izmerov

2023

Science Intensive Technologies in Mechanical Engineering

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Study of Physico-Chemical and Anti-Wear Properties of Motor Oils at the End of Operation

Shalygin,

Vashchishin,

Vashchishina

2024

Transport Engineering

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There is given the study of viscous properties of engine oil, depending on the temperature before and after change on modern domestic gasoline and diesel cars, the determination of spectral characteristics and X-ray fluorescence analysis of wear particles after mileage. The degree of viscosity of semi-synthetic oils of two types is estimated. The oils were cooled and heated up to 150 °C. A digital viscometer was used, the dynamic viscosity of all oils decreased with increasing temperature, which is associated with oxidation in waste oil. To assess the effect of motor oil on engine operation, IR spectrometric analysis is performed and the thickness of the lubricating film is determined. The test results showed a qualitative and quantitative change in the characteristic frequencies of the new engine oil and the spent one after 10,000 km. X-ray fluorescence analysis makes it possible to analyze wear products and determine which mechanism in the engine is most susceptible to wear. Lines have characteristic absorption frequencies and indicate a change in physico-chemical properties of oil in the engine. An increase in contamination and in the viscosity of used oils is associated with the presence of impurities formed during the oxidation and polymerization of the base oil. It is necessary to increase the number of samples and sampling during different periods of operation so that you can verify the same effect throughout the entire engine operation. The results obtained indicate that these methods can be used to analyze and control the mode of operation of oils in the engine, allowing to determine the wear and further apply appropriate additives to the oil to improve performance properties.

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Friction of mtl-metal surfaces

Cited by 2 publications

References 2 publications

Contact model and evaluation of friction force molecular component

Contact model and evaluation of friction force molecular component

Study of Physico-Chemical and Anti-Wear Properties of Motor Oils at the End of Operation

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