Energy Levels of Different Types of Contacts of Microirregularities of Friction Couples

Киндрачук, М. В.; Вольченко, Александр Иванович; Volchenko, D.A.; Skrypnyk, V.S.; Возный, А. В.

doi:10.1007/s11003-019-00272-5

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…At the same time, the ultrasonic signals under the cutting modes at frequencies n»3...30 MHz, observed in [28], correspond, according to expression (16), to the thermal complexes on electrons (m=m e ) at very moderate temperature values.…”

Section: Contact-induced Flutter and Buffeting Under The Cutting Modementioning

confidence: 79%

“…The studies of friction surfaces with regular geometric microelements [14][15][16] investigated the processes of exciting internal magnetic fields at the edges of discrete regions. It is shown that the combination of studies of friction and wear processes in areas such as mathematical statistics, contact mechanics, surface physics, provides a deeper explanation of non-stationary processes on discrete surfaces of contact elements.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Exchange interaction and models of contact generation of disturbances in tribosystems

Zaspa

Dykha

Marchenko

et al. 2020

EEJET

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The physical mechanisms have been investigated that form and transform the corpuscular-vortex-wave thermal complexes of disturbances in contact tribosystems based on the quantum-mechanical exchange interaction. The presence of a contact gap determines the generation of pairs of quasi-particles-disturbances stabilized by wavelength and frequency. Internal instability and collapse processes in such a system of disturbances lead to the formation of defects in a tribopair's material and underlie the emergency friction regimes. This paper gives specific technical examples of the generation of thermal complexes at fretting, during the friction of sliding and rolling, and at cutting. It has been established that the destructive nature of the process of fretting at low values of reverse sliding speeds is caused by the generation and collapse of the corpuscular-vortex-wave thermal complexes. An example of acoustic friction emission in the ultrasonic region of the spectrum has been used to show the quantum nature of the disturbances generated by friction. The high-frequency spectrum of acoustic emission corresponds to the unbalanced composition of the disturbances and leads to the formation of wear particles. The exchange interaction in a tribosystem involving rolling on the plane has been considered. The results of statistical analysis of such rolling showed the existence of the effect of negative friction caused by the quantum generation of longwave disturbances. It has been demonstrated that the collapsed component of the generation of disturbances is significantly increased under the modes of materials destruction, including when cutting the materials. The corpuscular-vortex-wave mechanism of selective transfer and hydrogen wear in tribosystems has been described. It is shown that the properties of a servovite film under the mode of selective transfer are provided by the collapse processes in the system of disturbances. Similar processes at the vortex-wave transfer of hydrogen atoms in metals lead to the wear and destruction of the surface layer of friction

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Section: Contact-induced Flutter and Buffeting Under The Cutting Modementioning

confidence: 79%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Exchange interaction and models of contact generation of disturbances in tribosystems

Zaspa

Dykha

Marchenko

et al. 2020

EEJET

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“…These dependences were obtained analytically. In this case, the following data were used: characteristics of the microgeometry of the surfaces of microprotrusions above the middle line of the profile Rp and the maximum radius of curvature of the protrusions rmax; a is the distance between microprotrusions; physical and mechanical characteristics of the material -elastic modulus E (Young's modulus), Poisson's ratio , specific electrical resistance of the material р', impulse nor-04034-3 mal force N, compressing the contact [8,9].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Thermoelectric Coolers with Friction Steam Brakes

Volchenko¹,

Киндрачук²,

Volchenko³

et al. 2022

J. Nano- Electron. Phys.

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In the materials of the article, the following issues are considered in relation to this problem: the efficiency of temperature reduction in a thermoelectric cooler; the nature of the destruction of an electric charge by thermal impulses; operating modes of thermopiles in brake friction pairs. The purpose of the article is to reduce the value of the ratio between the Peltier ("useful") and Joule ("harmful") effects in electric and thermal currents circulating in the thermopile branches, and the use of thermoelectric cooling in the friction pairs of the tape-shoe brake of the drawworks. The thermopiles installed in the friction linings of the brake band on its incoming and outgoing branches operated in the modes of a thermoelectric cooler and a thermoelectric generator, respectively. It has been established that when the energy loading is quasi-leveling in terms of the belt sweep angle of the pulley, the following is achieved on average: a decrease in energy loading to 20 %, an increase in the dynamic coefficient of friction by 11 %, and a decrease in liner wear by 8.5 % when they operate in the range of surface-bulk temperatures below the acceptable value for their materials.

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“…It is noted that materials based on Bi2Te3 with a large temperature difference in the legs of a thermoelement have a significantly lower overall efficiency parameter than its maximum value. It is recommended to maintain the latter, close to the maximum, at each point of the branch by changing the composition of materials along its length of the thermoelement [2].…”

Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 99%

Thermoelectric Generators Current Intensifiers

Kindrachuk,

Volchenko,

Zhuravlev

et al. 2023

J. Nano- Electron. Phys.

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The materials of the article included the following questions: operation of the FLEXTEG module in the thermoelectric generator mode; effects accompanying the thermoelectric generator and its current-voltage characteristic; the discussion of the results. The energy balance of thermal currents is estimated using the Seebeck and Thomson effects, as well as electric currents in the circuit -Peltier, and Joule-Lenz when changing the direction of their circulation. An isotropic design of a module of heat and power generators installed on an envelope flexible plate with different weights is obtained, which increases before the inflection line and decreases after it; in this case, the properties of semiconductors are independent of their location on the flexible plate. A reduction in the influence of a traveling electromagnetic bending wave on its deformation in a flexible plate has been achieved by distributing the weight of thermoelectric generators on the surface of the plate. The main factors influencing the properties of semiconductor materials and operating parameters of thermo-electric generators are estimated. The current-voltage characteristic of a thermoelectric generator with patterns of change in the intervals of voltage (0-6.0 V), current strength (0-1.4 A), power (0-4.0 W) at various temperature gradients (5, 0-105 °C), while the efficiency of thermoelectric generators was 84.0 %.

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Energy Levels of Different Types of Contacts of Microirregularities of Friction Couples

Cited by 4 publications

References 3 publications

Exchange interaction and models of contact generation of disturbances in tribosystems

Exchange interaction and models of contact generation of disturbances in tribosystems

Thermoelectric Coolers with Friction Steam Brakes

Thermoelectric Generators Current Intensifiers

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