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Journal articles on the topic 'Boundary friction mode'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Loktev, V. M., and Yu G. Pogorelov. "Boundary friction on molecular lubricants: rolling mode?" Low Temperature Physics 30, no. 4 (2004): 317–20. http://dx.doi.org/10.1063/1.1705439.

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2

Selvadurai, A. P. "Nonlinear mechanics of cracks subjected to indentation." Canadian Journal of Civil Engineering 33, no. 6 (2006): 766–75. http://dx.doi.org/10.1139/l06-019.

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The paper presents the application of a boundary element technique to study the behaviour of plane cracks that are located at corner regions of an elastic solid and open during indentation. In particular, the surfaces of the planes on which indentation takes place also exhibit Coulomb frictional responses and degradation in the friction angle with plastic energy dissipation. An incremental boundary element formulation, in which special singularity elements model the behaviour at the crack tip, is used to examine the crack problems. The methodology is applied to investigate the mode I stress in

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3

Ro, P. I., and P. I. Hubbel. "Model Reference Adaptive Control of Dual-Mode Micro/Macro Dynamics of Ball Screws for Nanometer Motion." Journal of Dynamic Systems, Measurement, and Control 115, no. 1 (1993): 103–8. http://dx.doi.org/10.1115/1.2897383.

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A desire to improve the positioning accuracy of ball screws prompted an investigation into the dynamics of nanometer motion. Characterization of the ball screw indicated that nanometer motion is possible prior to friction breakaway via elastic deformation of the frictional contacts while macroscopic motion involves slipping across the friction interfaces. The observed dynamics are nonlinear, and consequently result in inconsistent and unpredictable closed-loop response while under PI position control. The ball-screw can be modeled in two stages: The microdynamic stage includes “elastic” fricti

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4

Alexandrov, Sergei, Elena Lyamina, and Pierre-Yves Manach. "Solution Behavior Near Very Rough Walls under Axial Symmetry: An Exact Solution for Anisotropic Rigid/Plastic Material." Symmetry 13, no. 2 (2021): 184. http://dx.doi.org/10.3390/sym13020184.

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Rigid plastic material models are suitable for modeling metal forming processes at large strains where elastic effects are negligible. A distinguished feature of many models of this class is that the velocity field is describable by non-differentiable functions in the vicinity of certain friction surfaces. Such solution behavior causes difficulty with numerical solutions. On the other hand, it is useful for describing some material behavior near the friction surfaces. The exact asymptotic representation of singular solution behavior near the friction surface depends on constitutive equations a

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5

Zhang, Lijun, Wenbo Li, and Dejian Meng. "Influence of Heterogeneous Contact Stiffness and Heterogeneous Friction Coefficient on Frictional Squeal." Shock and Vibration 2018 (2018): 1–21. http://dx.doi.org/10.1155/2018/6379201.

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Contact stiffness and friction coefficient are excitation sources and key influencing factors to frictional squeal with obvious inhomogeneous characteristic that is always neglected. In this paper, a multipoint contact flexible pin-on-disc system is established considering tangential stiffness. Then influence of contact stiffness and friction coefficient with heterogeneous distribution on frictional squeal is studied using the complex modal analysis. The research shows that contact stiffness and friction coefficient heterogeneities influence the likelihood of occurrence of the squeal, the freq

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6

Boiko, M., T. Boiko, and I. Kolesnikov. "Influence of aldol condensation processes on the formation of surface films during friction in ester lubricants." Journal of Physics: Conference Series 2131, no. 5 (2021): 052037. http://dx.doi.org/10.1088/1742-6596/2131/5/052037.

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Abstract The boundary lubrication mode is usually implemented in conditions of low sliding speeds and high loads. The formation of strong boundary lubricating films under this friction mode determines the operability and durability of the friction units. It is believed that the formation of surface boundary films during friction includes the stages of the lubricant oxidation, and the aldol condensation reaction of oxidized molecules. As a result, high-molecular substances called “friction polymers” are formed. The paper studies the formation of surface films in the presence of substances with

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7

Lyashenko, I. A., and N. N. Manko. "Synergetic representation of stick-slip mode of boundary friction." Journal of Friction and Wear 34, no. 1 (2013): 38–45. http://dx.doi.org/10.3103/s1068366613010091.

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8

Tan, L., L. Lu, G. Q. Tang, L. Cheng, and X. B. Chen. "A viscous damping model for piston mode resonance." Journal of Fluid Mechanics 871 (May 24, 2019): 510–33. http://dx.doi.org/10.1017/jfm.2019.302.

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A viscous damping model is proposed based on a simplified equation of fluid motion in a moonpool or the narrow gap formed by two fixed boxes. The model takes into account the damping induced by both flow separation and wall friction through two damping coefficients, namely, the local and friction loss coefficients. The local loss coefficient is determined through specifically designed physical model tests in this work, and the friction loss coefficient is estimated through an empirical formula found in the literature. The viscous damping model is implemented in the dynamic free-surface boundar

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9

Cho, S. H., and K. A. Edge. "Adaptive sliding mode tracking control of hydraulic servosystems with unknown non-linear friction and modelling error." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 214, no. 4 (2000): 247–57. http://dx.doi.org/10.1243/0959651001540618.

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This paper deals with the use of adaptive discrete-time sliding mode tracking control in order to assure good tracking performance as well as to guarantee robustness against non-linear frictional forces and modelling error. The control scheme ensures that the absolute value of the sliding function decreases when it is outside the sliding boundary layer and the steady state value of the sliding function is bounded by the sliding boundary layer. Application of the scheme to a hydraulic servosystem has shown that adaptively estimated frictional forces compare favourably with those obtained from d

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10

Li, Shaowei, Chenxu Liu, Wang He, et al. "A Review of Electric Potential-Controlled Boundary Lubrication." Lubricants 11, no. 11 (2023): 467. http://dx.doi.org/10.3390/lubricants11110467.

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Tribotronics represents the modulation of friction via an external electric potential, a field with promising ramifications for intelligent devices, precision manufacturing, and biomedical applications. A profound elucidation of mechanisms that allow for potential-controlled friction is foundational to further research in this tribotronic domain. This article provides a comprehensive review of the research progress in electro-controlled friction over the past few decades, approached from the perspective of the boundary lubrication film at the friction interface, a direct influencer of electro-

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11

Zheng, Xuan, Lihong Su, Guanyu Deng, Jie Zhang, Hongtao Zhu, and Anh Tieu. "Study on Lubrication Characteristics of C4-Alkane and Nanoparticle during Boundary Friction by Molecular Dynamics Simulation." Metals 11, no. 9 (2021): 1464. http://dx.doi.org/10.3390/met11091464.

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Lubricant has been widely applied to reduce wear and friction between the contact surfaces when they are in relative motion. In the current study, a nonequilibrium molecular dynamics (NEMD) simulation was specifically established to conduct a comprehensive investigation on the dynamic contact between two iron surfaces in a boundary friction system considering the mixed C4-alkane and nanoparticles as lubricant. The main research objective was to explore the effects of fluid and nanoparticles addition on the surface contact and friction force. It was found that nanoparticles acted like ball bear

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12

Lyashenko, I. A., L. S. Metlov, A. V. Khomenko, and S. N. Chepulskyi. "Nonequilibrium kinetics of phase transitions in the boundary friction mode." Journal of Friction and Wear 33, no. 4 (2012): 244–52. http://dx.doi.org/10.3103/s106836661204006x.

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13

Huang, Huei-Ting, and Hsu-Wei Fang. "LUBRICATING CHARACTERISTICS OF HYALURONIC ACID MOLECULES ON THE ALBUMIN-MEDIATED TRIBOLOGICAL PROCESSES." Biomedical Engineering: Applications, Basis and Communications 24, no. 06 (2012): 557–62. http://dx.doi.org/10.4015/s1016237212500512.

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Synovial fluid mediated boundary lubrication is the key mechanism dominating the wear process of the artificial joint materials. The most abundant composition in the synovial fluid is albumin. It has been observed that the increasing human serum albumin (HSA) concentration leads to the increasing friction coefficient under the articulation of ultra-high molecular polyethylene (UHMWPE) and CoCrMo alloy materials. In this study, the friction and adsorption experiments were carried out to investigate the effects from addition of hyaluronic acid (HA) molecules. Our results indicated that the incre

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14

Wang, Jinbo, Michael A. Spall, Glenn R. Flierl, and Paola Malanotte-Rizzoli. "Nonlinear Radiating Instability of a Barotropic Eastern Boundary Current." Journal of Physical Oceanography 43, no. 7 (2013): 1439–52. http://dx.doi.org/10.1175/jpo-d-12-0174.1.

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Abstract Linear and nonlinear radiating instabilities of an eastern boundary current are studied using a barotropic quasigeostrophic model in an idealized meridional channel. The eastern boundary current is meridionally uniform and produces unstable modes in which long waves are most able to radiate. These long radiating modes are easily suppressed by friction because of their small growth rates. However, the long radiating modes can overcome friction by nonlinear energy input transferred from the more unstable trapped mode and play an important role in the energy budget of the boundary curren

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15

Lyashenko, Iakov A., Thao H. Pham, and Valentin L. Popov. "Effect of Indentation Depth on Friction Coefficient in Adhesive Contacts: Experiment and Simulation." Biomimetics 9, no. 1 (2024): 52. http://dx.doi.org/10.3390/biomimetics9010052.

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The quasi-static regime of friction between a rigid steel indenter and a soft elastomer with high adhesion is studied experimentally. An analysis of the formally calculated dependencies of a friction coefficient on an external load (normal force) shows that the friction coefficient monotonically decreases with an increase in the load, following a power law relationship. Over the entire range of contact loads, a friction mode is realized in which constant shear stresses are maintained in the tangential contact, which corresponds to the “adhesive” friction mode. In this mode, Amonton’s law is in

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16

Lyashenko, Iakov A., Thao H. Pham, and Valentin L. Popov. "Transition between Friction Modes in Adhesive Contacts of a Hard Indenter and a Soft Elastomer: An Experiment." Lubricants 12, no. 4 (2024): 110. http://dx.doi.org/10.3390/lubricants12040110.

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The tangential adhesive contact (friction) between a rigid steel indenter and a soft elastomer at shallow indentation depths, where the contact exists mainly due to adhesion, is investigated experimentally. The dependencies of friction force, contact area, average tangential stresses, and the coordinates of the front and back edges of the contact boundary on the indenter displacement are studied. It is found that first a stick–slip mode of friction is established, which is then replaced by another, more complex mode where the phase of a global slip of the elastomer on the indenter surface is a

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17

Higaki, H., T. Murakami, Y. Nakanishi, H. Miura, T. Mawatari та Y. Iwamoto. "The lubricating ability of biomembrane models with dipalmitoyl phosphatidylcholine and γ-globulin". Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 212, № 5 (1998): 337–46. http://dx.doi.org/10.1243/0954411981534114.

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Two kinds of friction tests were conducted to investigate the lubricating effect of the injection of amphiphilies on the osteoarthritic joint. The effects of the addition of Lα-dipalmitoyl phosphatidylcholine (Lα-DPPC) riposomes and γ-globulin in a saline solution of sodium hyaluronate (HA) were evaluated through pendulum friction tests. The frictional characteristics of pig shoulder joints were confirmed to depend on the viscosity of the lubricants only in the physiologically low load condition and in the condition immediately after loading. Detergent (polyoxyethylene p-t-octylphenyl ether) w

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18

Red’kin, V. E., Yu S. Tkachenko, P. O. Sukhodaev, and A. I. Lyamkin. "Friction and wear tester." Industrial laboratory. Diagnostics of materials 86, no. 8 (2020): 66–71. http://dx.doi.org/10.26896/1028-6861-2020-86-8-66-71.

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A compact and simple in design device (friction machine) for testing materials for friction and wear is developed. The device is intended for determination of the wear resistance and friction coefficient of structural, frictional and antifriction materials, as well as the tribological characteristics of lubricants. The measurement system of the device includes spring helical and flat spiral elastic elements, combined in one node and designed to measure the normal force and friction torque, respectively. Metal-cutting machines can be used as an external drive of the device. The friction machine

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19

Lyashenko, I. A., A. V. Khomenko, and A. M. Zaskoka. "Hysteresis Behavior in the Stick–Slip Mode at the Boundary Friction." Tribology Transactions 56, no. 6 (2013): 1019–26. http://dx.doi.org/10.1080/10402004.2013.819541.

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20

Buyanovskiy, Ilya, Vladimir Levchenko, and Vladimir Samusenko. "Investigation of the structure, composition and tribological characteristics of nanostructured monocrystalline coatings obtained by ion plasma technology." Science intensive technologies in mechanical engineering 2022, no. 4 (2022): 41–48. http://dx.doi.org/10.30987/2223-4608-2022-4-41-48.

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Synthesis technologies and mechanisms of action of nanostructured monocrystalline coatings using ion-plasma technologies have been viewed. This coating builds up a strong boundary layer on working surfaces of heavily loaded friction units, which provides the lubricant with high antifriction properties generated by triboprocess in boundary lubrication mode.

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21

Zhang, Jiyu, Wei Gao, and Qing Guo. "Extended State Observer-Based Sliding Mode Control Design of Two-DOF Lower Limb Exoskeleton." Actuators 12, no. 11 (2023): 402. http://dx.doi.org/10.3390/act12110402.

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Due to some model uncertainties and unknown friction disturbances that exist in the 2-DOF lower limb exoskeleton, a linear extended state observer (LESO) is proposed to estimate the unmeasurable angular velocity of two joints and the lumped uncertainties caused by friction disturbance and hydraulic parametric uncertainties. Meanwhile, by using the Lyapunov technique, a sliding mode controller is designed to improve the dynamic performance and the steady state accuracy of two joint angle responses in human–exoskeleton cooperative motion. By regulating the sliding mode controller gain, both the

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22

Wang, Qiliang, Jianmei Wang, Hongwei Cui, Jun Wang, and Fan Zhang. "Numerical investigation into thermal buckling of friction pairs in hydro-viscous drive under nonlinear radial temperature distribution." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 236, no. 6 (2021): 1081–90. http://dx.doi.org/10.1177/13506501211051523.

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Thermal buckling deformation can significantly impact the operating performance of hydro-viscous drive. A thermal buckling finite element shell model was established with the nonlinear radial temperature as the thermal loading condition. The thermal buckling behavior of friction pairs was investigated under three different boundary constraints. Moreover, the influence of thickness and material parameters on the critical buckling temperature was discussed. The simulation results coincide with the failure modes of friction pairs in practice, and the most common ones are the coning mode and the p

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23

Topolovec Miklozˇicˇ, K., and H. A. Spikes. "Application of Atomic Force Microscopy to the Study of Lubricant Additive Films." Journal of Tribology 127, no. 2 (2005): 405–15. http://dx.doi.org/10.1115/1.1843159.

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Constant force mode atomic force microscopy is used to examine the films formed on steel surfaces by three different types of lubricant additive. Work on molybdenum dithiocarbamate friction modifier additive solutions shows that this additive forms tiny domains of low friction on the high spots of rubbed surfaces. Complementary Raman surface analysis suggests that these domains represent crystallites of MoS2. Study of the reaction films formed by zinc dialkyldithiophosphate additives confirms the formation of pad-like structures by these additives on rubbed surfaces. Primary and secondary form

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24

Zhang, Yongbin, Huansheng Cheng, and Junyan Wang. "Recent Patents on Abnormal Hydrodynamic Thrust Slider Bearings: Part II-the Second Mode of the Bearings." Recent Patents on Mechanical Engineering 13, no. 1 (2020): 35–40. http://dx.doi.org/10.2174/2212797612666191031095436.

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Background: As a successive part, the paper introduces the second mode of abnormal hydrodynamic thrust slider bearings with divergent surface separations registered in the patents, where the boundary slippage is artificially designed both on the stationary surface in the inlet zone and on the whole moving surface. Objective : To introduce a second method for artificially designing the boundary slippage for the formation of abnormal hydrodynamic thrust slider bearings. Methods: The analytical results are presented for the introduced bearings. The performances of the bearings are demonstrated. R

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25

Kartik, V., and J. A. Wickert. "Surface Friction Guiding for Reduced High-Frequency Lateral Vibration of Moving Media." Journal of Vibration and Acoustics 129, no. 3 (2006): 371–79. http://dx.doi.org/10.1115/1.2732354.

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The free and forced vibration of a moving medium is examined in an application where distributed friction guiding is used to control lateral position passively. Subambient pressure features formed in the guides intentionally modify the naturally occurring self-pressurized air bearing and increase the contact force between the medium and the guide’s surface. These features increase friction to a level beyond that achievable based on the nominal wrap pressure. The moving medium is modeled as a beam that is transported over frictional regions and subjected to prescribed boundary disturbances aris

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26

Mukhacheva, T. L., T. M. Kalinina, and S. A. Kusmanov. "Evaluation of tribotechnical properties of modified surfaces after plasma electrolytic treatment." Journal of Physics: Conference Series 2144, no. 1 (2021): 012031. http://dx.doi.org/10.1088/1742-6596/2144/1/012031.

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Abstract The article considers the study of the effect of plasma electrolytic processing on the tribotechnical characteristics of medium-carbon steel. Friction tests were carried out in dry friction mode. Electron microscope and profilometer were used to study the friction tracks. For a comprehensive assessment of the quality of the modified surface layer, the Kragelsky-Kombalov complex parameter was calculated. It was found that plasma electrolytic treatment leads to a decrease in the coefficient of friction and weight wear in comparison with hardened and untreated steel. It has been determin

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27

Lyashenko, I. A., and A. M. Zaskoka. "Stick-Slip Mode of Boundary Friction as the First-Order Phase Transition." Ukrainian Journal of Physics 58, no. 1 (2013): 91–102. http://dx.doi.org/10.15407/ujpe58.01.0091.

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28

Lyashenko, I. A. "Tribological system in the boundary friction mode under a periodic external action." Technical Physics 56, no. 6 (2011): 869–76. http://dx.doi.org/10.1134/s1063784211060168.

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29

Lyashenko, Iakov A., and Alexei V. Khomenko. "Thermodynamic Theory of Two Rough Surfaces Friction in the Boundary Lubrication Mode." Tribology Letters 48, no. 1 (2012): 63–75. http://dx.doi.org/10.1007/s11249-012-9939-2.

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30

Ahn, Tae Shik, Dae Hyun Cho, and Young Ze Lee. "Evaluation of Friction Force, Wear Volume and Scuffing Life of Piston Rings and Cylinder Blocks with Different Surface Roughness for Low Friction Diesel Engine." Key Engineering Materials 345-346 (August 2007): 713–16. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.713.

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Wear and scuffing tests were conducted using friction and wear measurement of piston rings and cylinder blocks for the low friction diesel engine. Scuffing, described as sudden catastrophic failure of lubricated sliding surfaces, usually characterized by a sudden rapid increase in friction, temperature and noise, is an important failure mode on sliding surfaces. In this study, the frictional forces, wear amounts and cycles to scuffing in boundary lubricated sliding condition were measured using the reciprocating wear tester. The cylinder blocks with several values of surface roughness were use

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31

Ogam, Erick, Armand Wirgin, Z. E. A. Fellah, and Yongzhi Xu. "Experimental and Theoretical Nonlinear Dynamic Response of Intact and Cracked Bone-Like Specimens With Various Boundary Conditions." Journal of Vibration and Acoustics 129, no. 5 (2007): 541–49. http://dx.doi.org/10.1115/1.2731413.

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The potentiality of employing nonlinear vibrations as a method for the detection of osteoporosis in human bones is assessed. We show that if the boundary conditions (BC), relative to the connection of the specimen to its surroundings, are not taken into account, the method is apparently unable to differentiate between defects (whose detection is the purpose of the method) and nonrelevant features (related to the boundary conditions). A simple nonlinear vibration experiment is described which employs piezoelectric transducers (PZT) and two idealized long bones in the form of nominally-identical

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32

Luo, A. C. J. "Flow switching bifurcations on the separation boundary in discontinuous dynamical systems with flow barriers." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 221, no. 3 (2007): 475–95. http://dx.doi.org/10.1243/14644193jmbd42.

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In this paper, the flow passability on the separation boundary is investigated in discontinuous dynamic systems with flow barriers. The concepts of the flow barriers in discontinuous dynamical systems are introduced first. Because of the flow barriers existing on the separation boundary, the singularities of the flow on such a separation boundary will be changed accordingly. Therefore, the switching bifurcations from passable to non-passable flow or fromnon-passable to passable flowon the discontinuous boundary are discussed in this paper. Further, the necessary and sufficient conditions for t

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33

Zaharchenko, V. D., R. S. Mikheev, and I. E. Kalashnikov. "Mathematical methods in studying temperature-time conditions of the friction surfacing in the manufacture of functionally organized steel-aluminum compositions." Industrial laboratory. Diagnostics of materials 89, no. 9 (2023): 82–90. http://dx.doi.org/10.26896/1028-6861-2023-89-9-82-90.

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A mathematical model for studying temperature and time conditions of the process of friction surfacing in the manufacture of functionally organized steel-aluminum compositions has been developed and validated. Bars made of pure aluminum grade ER1100 were used as the consumable rod material during friction surfacing. The substrate in the form of a rectangular plate was made of high-quality steel 20. The geometric model of the object when modeling the process of friction surfacing in the ANSYS 2021R2 software package was specified in the form of a rod and a substrate. The initial data for calcul

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34

Yu, Hai-jie, Hai-jun Wei, Jing-ming Li, Da‐ping Zhou, Li‐dui Wei, and Hong Liu. "Lubrication State Recognition Based on Energy Characteristics of Friction Vibration with EEMD and SVM." Shock and Vibration 2021 (April 22, 2021): 1–7. http://dx.doi.org/10.1155/2021/9972119.

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In order to identify different lubrication states, lubrication experiments were carried out on a Bruker UMT-3 tester. The experimental results show that the frequency band energy characteristics of friction vibration signals are different under different lubrication states. Based on this, a lubrication state recognition method with ensemble empirical mode decomposition (EEMD) and support vector machine (SVM) was proposed. The vibration signals were decomposed into a finite number of stationary intrinsic mode functions (IMFs) with the EEMD method. The first six IMF components containing the mai

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35

Qin, Wenyuan, Hui Qin, Hongbo Zheng, and Zhiyi Zhang. "The coupled effect of bearing misalignment and friction on vibration characteristics of a propulsion shafting system." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 1 (2017): 150–63. http://dx.doi.org/10.1177/1475090217722875.

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The propulsion shafting system of ships is usually supported, in part, by water-lubricated rubber bearings, which often work at mixed or boundary lubrication state under heavy-load and low-speed conditions, resulting in strong friction on the bearing–shaft interface and even abnormal vibration in the overall system. In addition, bearing misalignment can further affect the distribution of friction and consequently change the lateral and torsional vibration characteristics of the shafting system. In this work, the rubber bearing was simplified into parallel-distributed springs and the water film

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36

Edwards, Catherine R., and Harvey E. Seim. "Complex EOF Analysis as a Method to Separate Barotropic and Baroclinic Velocity Structure in Shallow Water." Journal of Atmospheric and Oceanic Technology 25, no. 5 (2008): 808–21. http://dx.doi.org/10.1175/2007jtecho562.1.

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Abstract Defining the vertical depth average of measured currents to be barotropic is a widely used method of separating barotropic and baroclinic tidal currents in the ocean. Away from the surface and bottom boundary layers, depth-averaging measured velocity is an excellent estimate of barotropic tidal flow, and internal tidal dynamics can be well represented by the difference between the measured currents and their depth average in the vertical. However, in shallow and/or energetic tidal environments such as the shelf of the South Atlantic Bight (SAB), bottom boundary layers can occupy a sig

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37

He, Yubao, Hongyan Huang, and Daren Yu. "Backpressure propagation mode and balance property in a rectangular duct." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 4 (2018): 1472–89. http://dx.doi.org/10.1177/0954410018760339.

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The backpressure propagation mode accompanied by shock-train evolution is investigated numerically in a rectangular duct with an open space. On this basis, the balance mechanism and parametric effects of heat transfer and skin friction for backpressure propagation are revealed to understand the nature of force competition better. As a result, the backpressure propagation mode can be classified into two different flow processes with increased backpressure. In addition, balance property mechanism reveals that both the momentum inside the boundary layer and the shear force which transfers the mom

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38

Zhang, Lun, Zhongzheng Jiang, and Weifang Chen. "Effects of wall transpiration on the supersonic boundary-layer oblique-type transition." Journal of Physics: Conference Series 2764, no. 1 (2024): 012029. http://dx.doi.org/10.1088/1742-6596/2764/1/012029.

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Abstract The study of transpiration cooling is vital for the development of high-speed aircraft. In the current work, direct numerical simulation (DNS) is performed to investigate the impacts of wall transpiration on the boundary-layer oblique breakdown over a Mach 2 flat plate. The porous injection model is used to mimic the transpiration from the equally spaced circular pores. It has been observed from the numerical results that wall transpiration leads to the amplified growth rate of the imposed oblique mode waves, steady vortex waves, and other higher-harmonic waves. As a result, the occur

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39

Sayadi, Taraneh, Peter J. Schmid, Joseph W. Nichols, and Parviz Moin. "Reduced-order representation of near-wall structures in the late transitional boundary layer." Journal of Fluid Mechanics 748 (April 28, 2014): 278–301. http://dx.doi.org/10.1017/jfm.2014.184.

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AbstractDirect numerical simulations (DNS) of controlled H- and K-type transitions to turbulence in an $M = 0.2$ (where $M$ is the Mach number) nominally zero-pressure-gradient and spatially developing flat-plate boundary layer are considered. Sayadi, Hamman & Moin (J. Fluid Mech., vol. 724, 2013, pp. 480–509) showed that with the start of the transition process, the skin-friction profiles of these controlled transitions diverge abruptly from the laminar value and overshoot the turbulent estimation. The objective of this work is to identify the structures of dynamical importance throughout

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40

Dykha, O., та A. Staryi. "Нeat and mass transfer models at boundary lubrication to determine the transition temperatures". Problems of tribology 102, № 4 (2021): 42–50. http://dx.doi.org/10.31891/2079-1372-2021-102-4-42-50.

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At present, kinetic and thermodynamic methods for assessing the lubricating effect of oils are being increasingly developed. At the limit friction, the reduction of friction and wear of surfaces is due to the ability of the lubricant to form layers of adsorption or chemical origin on the surface. Analytical models of transition temperatures and wear in the limit lubrication mode must be used to mathematically describe the processes in the subsystems and the transition between them. The Fourier equation of thermal conductivity is accepted as the basic calculated dependence. It is assumed that t

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Chang, L., and H. Zhang. "A Mathematical Model for Frictional Elastic-Plastic Sphere-on-Flat Contacts at Sliding Incipient." Journal of Applied Mechanics 74, no. 1 (2005): 100–106. http://dx.doi.org/10.1115/1.2178838.

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This paper presents a mathematical model for frictional elastic-plastic sphere-on-flat contacts at sliding incipient. The model is developed based on theoretical work on contact mechanics in conjunction with finite-element results. It incorporates the effects of friction loading on the contact pressure, the mode of deformation, and the area of contact. The shear strength of the contact interface is, in this paper, assumed to be proportional to the contact pressure with a limiting value that is below the bulk shear strength of the sphere. Other plausible interfacial-shear-strength characteristi

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Denape, J., T. Masri, and J.-A. Petit. "Influence of Surface Roughness and Oil Ageing on Various Ceramic-Steel Contacts under Boundary Lubrication." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 3 (1995): 173–82. http://dx.doi.org/10.1243/pime_proc_1995_209_422_02.

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The friction and wear behaviour of four structural ceramics (two aluminium oxides of different purity, a silicon nitride and a tetragonal zirconia polycrystal) have been investigated under boundary lubrication against a 100C6 hard steel (52100 steel). The effect of three initial surface roughnesses of the ceramics is studied. Lubrication is by a commercial oil used ‘as received’ (new oil) and ‘aged’ (used oil). Tests are performed on an alternating ‘pin-on-plate’ tribometer. The friction and wear responses are analysed in terms of three main parameters depending on the mechanical preparation m

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Vasilenko, V. V., V. I. Kirishchieva, M. A. Mukutadze, and V. E. Shvedova. "Investigation of the Wear Resistance of a Journal Bearing with Polymer-Coated Grooved Support Ring." Advanced Engineering Research 22, no. 4 (2023): 365–72. http://dx.doi.org/10.23947/2687-1653-2022-22-4-365-372.

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Introduction. In modern heavy-loaded friction units, metallopolymer coated bearings operating in the boundary friction mode are widely used. Their successful application is provided by the viscoelastic deformation of these coatings under load. To pass from boundary friction to liquid friction, it is required to create a bearing hydrodynamic wedge. Currently, the use of journal bearings with polymer-coated grooved support ring is hindered by the lack of a methodology for their calculation. This work analyzes a model of movement of a micropolar lubricant in the operating clearance of a journalbe

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Lyashenko, Iakov A., Vadym N. Borysiuk, and Valentin L. Popov. "Stick–slip boundary friction mode as a second-order phase transition with an inhomogeneous distribution of elastic stress in the contact area." Beilstein Journal of Nanotechnology 8 (September 8, 2017): 1889–96. http://dx.doi.org/10.3762/bjnano.8.189.

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This article presents an investigation of the dynamical contact between two atomically flat surfaces separated by an ultrathin lubricant film. Using a thermodynamic approach we describe the second-order phase transition between two structural states of the lubricant which leads to the stick–slip mode of boundary friction. An analytical description and numerical simulation with radial distributions of the order parameter, stress and strain were performed to investigate the spatial inhomogeneity. It is shown that in the case when the driving device is connected to the upper part of the friction

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Bergeot, Baptiste, Sébastien Berger, and Sergio Bellizzi. "Mode coupling instability mitigation in friction systems by means of nonlinear energy sinks: Numerical highlighting and local stability analysis." Journal of Vibration and Control 24, no. 15 (2017): 3487–511. http://dx.doi.org/10.1177/1077546317707101.

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In this paper, we study the problem of passive control of friction-induced vibrations due to mode coupling instability in braking systems. To achieve that, the well-known two degrees of freedom Hultén’s model, which reproduces the typical dynamic behavior of friction systems, is coupled to two ungrounded nonlinear energy sinks (NES). The NES involves an essential cubic restoring force and a linear damping force. First, using numerical simulations it is shown that the suppression or the mitigation of the instability is possible and four steady-state responses are highlighted: complete suppressi

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Al-Quraan, Tareq M. A., Olha Ilina, Mukola Kulyk, Rudolf Mnatsakanov, Oksana Mikosianchyk, and Volodumur Melnyk. "Dynamic Processes of Self-Organization in Nonstationary Conditions of Friction." Advances in Tribology 2023 (February 27, 2023): 1–13. http://dx.doi.org/10.1155/2023/6676706.

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Self-organization mechanisms of metastable dissipative structures during friction depending on base and oil functional additives for hypoid gears are considered. Research was conducted on a software-hardware complex with simulation of gears’ operation in rolling with slipping conditions in start-stop mode. Indicators of formation of wear-resistant dissipative structures include the following: improvement of antifriction characteristics, lubricant boundary layers’ formation, contact surfaces’ strengthening, and formation of heterogeneous deformation microrelief with a fine-grained structure. Th

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Sun, Zhexun, Elizabeth Feeney, Ya Guan, et al. "Boundary mode lubrication of articular cartilage with a biomimetic diblock copolymer." Proceedings of the National Academy of Sciences 116, no. 25 (2019): 12437–41. http://dx.doi.org/10.1073/pnas.1900716116.

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We report the design of a diblock copolymer with architecture and function inspired by the lubricating glycoprotein lubricin. This diblock copolymer, synthesized by sequential reversible addition–fragmentation chain-transfer polymerization, consists of a cationic cartilage-binding domain and a brush-lubricating domain. It reduces the coefficient of friction of articular cartilage under boundary mode conditions (0.088 ± 0.039) to a level equivalent to that provided by lubricin (0.093 ± 0.011). Additionally, both the EC50 (0.404 mg/mL) and cartilage-binding time constant (7.19 min) of the polyme

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Yevtushenko, Aleksander, Katarzyna Topczewska, and Przemysław Zamojski. "Temperature during Repetitive Short-Term Operation of a Brake with Functionally Graded Friction Element." Materials 16, no. 2 (2023): 881. http://dx.doi.org/10.3390/ma16020881.

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The object of study is the temperature of a braking system, operating in repetitive short-term (RST) mode. One element of the considered friction pair is made of a functionally gradient material (FGM), and the other of a homogeneous material. To determine the temperature on the friction surfaces of both elements, the previously obtained, exact solution of the boundary value problem of heat conduction was adopted, with account of the heat generation due to the friction. A calculation scheme was proposed that takes into consideration thermal sensitivity of materials and variations of the frictio

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Miller, G. R. "A Preliminary Analysis of Subsurface Crack Branching Under a Surface Compressive Load." Journal of Tribology 110, no. 2 (1988): 292–96. http://dx.doi.org/10.1115/1.3261601.

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This paper presents the results of a preliminary analysis of the branching behavior of a horizontal subsurface crack subjected to a moving compressive surface load. The purpose of the analysis is to provide some fundamental understanding concerning the behavior of subsurface contact fatigue cracks, including the onset of pitting or delamination. The analysis is approximate inasmuch as the traction-free boundary condition at the surface is only partially satisfied, and the history dependent effects arising from crack face friction are not included. The results show that mode I branching crack g

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Болотов, Александр Николаевич, Ольга Олеговна Новикова, and Владислав Викторович Новиков. "SILICONE MAGNETIC NANOFLUIDS ADAPTED FOR THE CONDITIONS OF BOUNDARY FRICTION." Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials, no. 12() (December 15, 2020): 546–56. http://dx.doi.org/10.26456/pcascnn/2020.12.546.

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Известные в настоящее время магнитные смазочные наножидкости имеют недостаточно хорошие триботехнические характеристики при эксплуатации в режиме граничного трения. Предложен способ адаптации для граничного трения магнитных силоксановых наножидкостей, путем модификации их состава химически активными антифрикционными, противоизносными и противозадирными присадками. Создан ряд смазочных композиций магнитных наножидкости на основе полиэтилсилоксана ПЭС-5. Поведенные экспериментальные исследования показали, что наиболее значительное улучшение антифрикционных и противоизносных свойств наножидкостей

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