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Journal articles on the topic 'Boundary lubricant'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Liu, Xiaoyan, and Per M. Claesson. "Bioinspired Bottlebrush Polymers for Aqueous Boundary Lubrication." Polymers 14, no. 13 (2022): 2724. http://dx.doi.org/10.3390/polym14132724.

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An extremely efficient lubrication system is achieved in synovial joints by means of bio-lubricants and sophisticated nanostructured surfaces that work together. Molecular bottlebrush structures play crucial roles for this superior tribosystem. For example, lubricin is an important bio-lubricant, and aggrecan associated with hyaluronan is important for the mechanical response of cartilage. Inspired by nature, synthetic bottlebrush polymers have been developed and excellent aqueous boundary lubrication has been achieved. In this review, we summarize recent experimental investigations of the int

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2

Xu, Rong-Guang, and Yongsheng Leng. "Squeezing and stick–slip friction behaviors of lubricants in boundary lubrication." Proceedings of the National Academy of Sciences 115, no. 26 (2018): 6560–65. http://dx.doi.org/10.1073/pnas.1805569115.

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The fundamental questions of how lubricant molecules organize into a layered structure under nanometers confinement and what is the interplay between layering and friction are still not well answered in the field of nanotribology. While the phase transition of lubricants during a squeeze-out process under compression is a long-standing controversial debate (i.e., liquid-like to solid-like phase transition versus amorphous glass-like transition), recent different interpretations to the stick–slip friction of lubricants in boundary lubrication present new challenges in this field. We carry out m

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3

Taylor, R. I. "Engine friction: The influence of lubricant rheology." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 211, no. 3 (1997): 235–46. http://dx.doi.org/10.1177/135065019721100306.

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The sensitivity of engine friction to lubricant viscometry has been determined for a modern fuelefficient engine, the Mercedes Benz M111 2.0 litre gasoline engine, under both cold starting and fully warmed-up conditions. The study has taken into account realistic lubricant viscometric parameters such as the lubricant viscosity variation with shear rate and temperature. Results are reported for the variation of engine friction with different monograde and multigrade lubricants, including the distribution of friction losses between valve train, piston assembly and bearings with the different lub

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4

Chong, William Woei Fong, Siti Hartini Hamdan, King Jye Wong, and Suzana Yusup. "Modelling Transitions in Regimes of Lubrication for Rough Surface Contact." Lubricants 7, no. 9 (2019): 77. http://dx.doi.org/10.3390/lubricants7090077.

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Accurately predicting frictional performance of lubrication systems requires mathematical predictive tools with reliable lubricant shear-related input parameters, which might not be easily accessible. Therefore, the study proposes a semi-empirical framework to predict accurately the friction performance of lubricant systems operating across a wide range of lubricant regimes. The semi-analytical framework integrates laboratory-scale experimental measurements from a pin-on-disk tribometer with a unified numerical iterative scheme. The numerical scheme couples the effect of hydrodynamic pressure

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Ning, Lipu, Xianghui Meng, and Youbai Xie. "Effects of lubricant shear thinning on the mixed lubrication of piston skirt-liner system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 7 (2012): 1585–98. http://dx.doi.org/10.1177/0954406212460610.

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A theoretical analysis is presented for the mixed lubrication of the piston skirt-liner system. The model is developed to consider the shear thinning effect of multigrade lubricant. The friction characteristics of the piston skirt-liner system for both monograde and multigrade lubricants are investigated. It is found that a decrease in the lubricant viscosity is effective in reducing the friction loss. However, the boundary friction at the expansion stroke will increase with low lubricant viscosity. Results in this study show a significant lubricant shear thinning effect on the piston skirt-li

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6

Kato, S., E. Marui, A. Kobayashi, and S. Senda. "The Influence of Lubricants on Static Friction Characteristics Under Boundary Lubrication." Journal of Tribology 107, no. 2 (1985): 188–94. http://dx.doi.org/10.1115/1.3261018.

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Based on a new boundary lubrication model, the characteristics of lubricants under boundary lubrication at low sliding speed and low contact pressure such as in machine tool slideways are investigated in relation to surface topography. It is clarified theoretically and ascertained experimentally that the property of lubricants under boundary lubrication can be estimated by the newly defined appraisal coefficient of boundary lubrication property determined by the thickness and load carrying capacity of adsorbed lubricant film and the surface topography.

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Kobayashi, A., N. Unno, and T. Yonemoto. "Study on the Adhesion Force of Lubricants—Adhesion Force Characteristics Under Boundary Lubrication." Journal of Tribology 119, no. 1 (1997): 107–11. http://dx.doi.org/10.1115/1.2832443.

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The mechanisms that generate adhesion forces in liquid lubricants are studied under various experimental conditions. These forces occur between two surfaces when they are detached in the normal direction under static boundary lubrication conditions. The adhesion force is not influenced by the speed at which the upper specimen is pulled up, but is influenced by the viscosity of the lubricant. The adhesion force under boundary lubrication is much greater than that under hydrodynamic lubrication, and it is closely related to the compressibility of the lubricant.

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8

Voronin, Serhii, Ivan Hrunyk, Bashir Asadov, Dmytro Onopreychuk, and Volodymyr Stefanov. "Study of the Process of Lubricant Application on the Friction Surface Using Aerosol Lubricators." International Journal of Engineering & Technology 7, no. 4.3 (2018): 20. http://dx.doi.org/10.14419/ijet.v7i4.3.19546.

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The problem of calculation and forecasting main parameters of aerosol lubricators designed for applying lubricants on angled to the horizon friction surfaces e.g. the lateral surfaces of a rail and a wheel flange of railway rolling stock is solved in the article. The main parameters of lubricators being considered in the article are compressed air supply, the geometry of a spray nozzle and the boundary thickness of a lubricant layer applied to the friction surface where there is no creep of a lubricant under the action of gravity. A structural model of application and retention of a lubricant

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9

Goerlach, Bernd, Walter Holweger, Lalita Kitirach, and Joerg Fliege. "Predicting Wear under Boundary Lubrication: A Decisive Statistical Study." Lubricants 11, no. 12 (2023): 514. http://dx.doi.org/10.3390/lubricants11120514.

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The forthcoming revolution in mobility and the use of lubricants to ensure ecological friendliness intensifies the pressure on tribology for predictors in new life cycles, mainly addressing wear. The current paper aims to obtain such predictors by studying how the wear processes that occur in a standard FE8 bearing test rig under thin film lubrication are conducted by the properties of the lubricant rather than simple viscosity parameters. Assuming that the activity of a lubricant with respect to the temperature, surface, and chemicals is a matter of its chemical potential, the results show th

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10

Fominov, Evgeny, Constantine Shuchev, and Maksim Gavrilenko. "The dynamic model of lubricating layer formation/destruction processes in boundary and mixed friction modes." E3S Web of Conferences 592 (2024): 05023. http://dx.doi.org/10.1051/e3sconf/202459205023.

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The article is dedicated to studies of self-organization processes evolving in time in boundary lubricant layers. The essence of the article consists in use of the model of the connected processes of formation and destruction of a shielding delayed lubricant layer based on differential equations similar to that which are used for description in time of dynamics of probabilities of states of a single channel system of queueing theory with Poisson stream of queries and exponential service (Kolmogorov-Chapman equations). Proposed method involves introducing concepts: the intensity of delayed laye

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11

Anand, M., M. Hadfield, B. Thomas, and R. Cantrill. "The depletion of ZDDP additives within marine lubricants and associated cylinder liner wear in RNLI lifeboat engines." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 231, no. 1-2 (2016): 162–70. http://dx.doi.org/10.1177/1464420716663235.

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Previous work of authors indicated the wear of cylinder liners in marine engines of RNLI lifeboats due to the intense lubricant degradation identified by inductively coupled plasma and Fourier Transform Infrared spectroscopy techniques. In this paper, further analysis carried out to evaluate the effects of lubricant degradation on the actual cylinder liners installed in the Trent Class Lifeboat engines is presented. Surface characterisation of actual cylinder liner’s bore surface showed maximum wear near the top dead centre region compared to rest of the piston stroke. Wear in this region of t

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12

García-Miranda, J. Santos, Luis Daniel Aguilera-Camacho, María Teresa Hernández-Sierra, and Karla J. Moreno. "A Comparative Analysis of the Lubricating Performance of an Eco-Friendly Lubricant vs Mineral Oil in a Metallic System." Coatings 13, no. 8 (2023): 1314. http://dx.doi.org/10.3390/coatings13081314.

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Eco-friendly lubricant research continues to increase since it has a comparative performance to commercial mineral lubricants to overcome the effects of environmental impact. However, the efficiency of these green lubricants depends on specific applications. In this study, we analyzed the friction and wear performance of a castor/sesame oil mixture as an eco-friendly lubricant and its comparison to a commercial mineral lubricant tested in a metallic system employed in bearing elements. For this purpose, AISI 8620 steel against ISO 100Cr6 was used as tribological pair. The friction and wear tes

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13

Bell, J., A. A. Besong, J. L. Tipper, et al. "Influence of gelatin and bovine serum lubricants on ultra-high molecular weight polyethylene wear debris generated in in vitro simulations." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 214, no. 5 (2000): 513–18. http://dx.doi.org/10.1243/0954411001535543.

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Ultra-high molecular weight polyethylene (UHMWPE) wear debris induced osteolysis has a major role in the late aseptic loosening and ultimate failure of total hip replacements (THR). Clinically relevant in vitro simulations of wear are essential to predict the osteolytic potential of bearing surfaces in artificial hip joints. Newborn calf or bovine serum has been accepted as a boundary lubricant for such in vitro tests, but its biological stability has been questioned. This study compared the wear factors, number of wear particles and levels of microbial contamination produced in bovine serum a

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14

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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15

Czarny, Ryszard. "THE EFFECT OF THE TYPE OF WALL MATERIAL AND GREASE COMPOSITION PAIRING ON SHEAR STRESSES IN BOUNDARY LAYER." Tribologia 284, no. 2 (2019): 27–36. http://dx.doi.org/10.5604/01.3001.0013.4146.

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The paper presents the results of research on the influence of fillers introduced into plastic greases on the rheological properties of the boundary layer of the resultant lubricant compositions. The fillers were PTFE and MoS2 powders. They are added to lubricants to improve their tribological properties; however, these fillers also affect the rheological properties of the composition. This affects the change of the shear stress value in the lubricant during its flow in the lubrication system. Knowledge of this value, especially during the flow of the lubricant composition in the boundary laye

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16

Carré, D. J. "Perfluoropolyalkylether lubricants under boundary conditions: Iron catalysis of lubricant degradation." Journal of Synthetic Lubrication 6, no. 1 (1989): 1–15. http://dx.doi.org/10.1002/jsl.3000060102.

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17

Holweger, Walter, Luigi Bobbio, Zhuoqiong Mo, Jörg Fliege, Bernd Goerlach, and Barbara Simon. "A Computational Study on the Role of Lubricants under Boundary Lubrication." Lubricants 11, no. 2 (2023): 80. http://dx.doi.org/10.3390/lubricants11020080.

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The knowledge of how lubricants contribute to the operational life of a drive train is unclear until now, despite the fact that plenty of literature is available. A novel concept is presented in order to estimate the wear appearing in bearings addressed to the regime of mixed friction with respect to the composition and the so-called “inner” structure of the lubricant. In doing so, the composition is turned into a set of predictors describing the dipolar and inducible dipolar properties of all components as an activity amongst them and toward the surface. The results show that the activity of

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18

Carre´, D. J., P. D. Fleischauer, C. G. Kalogeras, and H. D. Marten. "Comparison of Lubricant Performance in an Oscillating Spacecraft Mechanism." Journal of Tribology 113, no. 2 (1991): 308–12. http://dx.doi.org/10.1115/1.2920621.

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A life test of lubricants for the R2 shaft bearings of a spacecraft oscillating scanner mechanism was performed under simulated orbital conditions. The lubricant originally used in the application, a chloroarylalkylsiloxane (CAS) oil, and a linear perfluoropolyalkylether (PFPE) oil failed in less than 2500 hr of operation. A poly-alpha-olefin (PAO) oil has been running for more than 11,000 hr without any indication of lubricant or system degradation. The performances of the oils are discussed in terms of the boundary lubrication conditions of the test.

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19

Singh, Devendra, G. D. Thakre, L. N. Sivakumar Konathala, and V. V. D. N. Prasad. "Friction Reduction Capabilities of Silicate Compounds Used in an Engine Lubricant on Worn Surfaces." Advances in Tribology 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1901493.

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Effects of magnesium silicate and alumina dispersed in engine lubricant on friction, wear, and tribosurface characteristics are studied under boundary and mixed lubrication conditions. Magnesium silicate and alumina, henceforth called as friction reducing compounds (FRC), were dispersed in engine lubricant in very low concentration of 0.01% weight/volume. Four-ball wear test rig was used to assess friction coefficient and wear scar diameter of balls lubricated with and without FRC based engine lubricant. Scanning electron microscopy (SEM) equipped with Energy Dispersive X-ray (EDX) was used to

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20

Kumar, Rajneesh, and Suresh Verma. "Effect of micropolar lubrication in non-circular hole-entry hybrid journal bearing with constant flow valve restrictor." Industrial Lubrication and Tribology 68, no. 6 (2016): 737–51. http://dx.doi.org/10.1108/ilt-07-2015-0097.

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Purpose In the present scenario of high-speed machines, the use of non-circular hole-entry bearing configuration, i.e. two-lobe, multi-lobe, lemon bore, etc., has becomes unavoidable, as the journal bearings with non-circular configurations provide better stability at high operating speed and heavy dynamic loading. Further, this research aims to show that the presence of micro particles in the lubricants greatly affects performance of the bearings, as their presence leads to non-Newtonian behaviors of the lubricant. Therefore, to consider the effect of these micro particles, the lubricant is m

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21

Hills, B. A., and M. K. Monds. "Enzymatic identification of the load-bearing boundary lubricant in the joint." Rheumatology 37, no. 2 (1998): 137–42. http://dx.doi.org/10.1093/oxfordjournals.rheumatology.a031463.

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Abstract Bovine articular cartilage and synovial fluid (SF) were co-incubated with one of three enzymes selected to destroy each of the three major contenders for the active ingredient imparting such remarkable load-bearing lubrication to the normal joint. Destroying hyaluronic acid (HA), alias hyaluronan, with hyaluronidase, both frictional and wear tests displayed no significant change in accordance with most previous studies of SF alone. Destroying surface-active phospholipid (SAPL) with phospholipase A2, there was a highly significant dose-dependent compromise of lubrication as recorded on

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22

Fragassi, Agnese, Antonietta Greco, and Roberto Palomba. "Lubricant Strategies in Osteoarthritis Treatment: Transitioning from Natural Lubricants to Drug Delivery Particles with Lubricant Properties." Journal of Xenobiotics 14, no. 3 (2024): 1268–92. http://dx.doi.org/10.3390/jox14030072.

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Osteoarthritis (OA) is a debilitating joint disease characterized by cartilage degradation, leading to pain and functional impairment. A key contributor to OA progression is the decline in cartilage lubrication. In physiological conditions, synovial fluid (SF) macromolecules like hyaluronic acid (HA), phospholipids, and lubricin play a crucial role in the boundary lubrication of articular cartilage. In early OA, cartilage damage triggers inflammation, altering SF composition and compromising the lubrication layer. This increases friction between mating interfaces, worsening cartilage degradati

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23

Jackson, J. E., T. Gangjee, and I. Haque. "Lubricant Modeling and Its Effect on Simulation of Material Forming." Journal of Engineering Materials and Technology 111, no. 1 (1989): 74–80. http://dx.doi.org/10.1115/1.3226436.

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Solid cylinder upsetting is analyzed using three different approaches for frictional boundary condition modeling. These are (1) constant shear friction factor, (2) experimentally measured frictional stresses, and (3) analytical models accounting for lubricant entrapment and redistribution. All three approaches are implemented in the CFORM finite element code. The error between the three approaches and actual experimental measurements of the material deformation and interfacial pressures is investigated. It is shown that the constant shear friction factor is more accurate for solid film lubrica

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Bewsher, Stephen Richard, M. Leighton, Mahdi Mohammadpour, Homer Rahnejat, Guenter Offner, and Oliver Knaus. "Atomic force microscopic measurement of a used cylinder liner for prediction of boundary friction." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 7 (2018): 1879–89. http://dx.doi.org/10.1177/0954407018792143.

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Accurate simulation performs a crucial role in the design and development of new modern internal combustion engines. In the case of piston rings, simulations are used to effectively predict generated friction and power loss of proposed designs. These are consequences of viscous shear of a thin lubricant film, likewise boundary friction caused by direct interaction of piston rings with the cylinder liner/bore surface. The most commonly used model for determining boundary friction is that of Greenwood and Tripp. The model requires the pressure coefficient of boundary shear strength of asperities

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ODA, Tomoki, Noritsugu UMEHARA, Takayuki TOKOROYAMA, et al. "Boundary Lubricant Film Modeling of Ester Mixture Lubricants in Severe Sequestration Environments." Proceedings of the Machine Design and Tribology Division meeting in JSME 2024.23 (2024): 2A1–6. https://doi.org/10.1299/jsmemdt.2024.23.2a1-6.

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ODA, Tomoki, Noritsugu UMEHARA, Takayuki TOKOROYAMA, Naoya HASHIDUME, Daisuke TAKEKAWA, and Keiichi NARITA. "Boundary Lubricant Film Modeling of Ester Mixture Lubricants in Severe Sequestration Environments." Proceedings of Mechanical Engineering Congress, Japan 2023 (2023): S114–25. http://dx.doi.org/10.1299/jsmemecj.2023.s114-25.

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27

Leighton, M., T. Nicholls, M. De la Cruz, R. Rahmani, and H. Rahnejat. "Combined lubricant–surface system perspective: Multi-scale numerical–experimental investigation." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 7 (2016): 910–24. http://dx.doi.org/10.1177/1350650116683784.

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Frictional losses are one of the main causes of reduced energy efficiency in all machines and mechanisms. In particular, there is mounting pressure upon manufacturers of all forms of vehicle to comply with increasingly stringent legislation and directives with regard to harmful emissions. Therefore, reduction of friction has become an imperative issue. The traditional approach of dealing with surface material and lubricant formulation in isolation has been replaced by a lubricant–surface system approach. This paper presents multi-scale experimentation from nano/meso-scale lateral force microsc

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28

Stolarski, T. A. "Quantitative criteria for boundary lubricant selection." Wear 150, no. 1-2 (1991): 159–68. http://dx.doi.org/10.1016/0043-1648(91)90313-j.

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Sajeeb, Ayamannil, and Perikinalil K. Rajendrakumar. "Tribological assessment of vegetable oil based CeO2/CuO hybrid nano-lubricant." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 12 (2020): 1940–56. http://dx.doi.org/10.1177/1350650119899208.

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Vegetable oil based lubricants attract much attention nowadays due to their excellent boundary lubrication performance and biodegradability. Coconut oil is a vegetable oil with excellent lubricating properties which provides low friction coefficient and better oxidation stability. The purpose of this study is to investigate the performance of coconut oil based new hybrid CeO2/CuO nano-lubricant with various ratios of CeO2/CuO viz. 25/75, 50/50, and 75/25 at different concentrations (0.1, 0.25, 0.5, and 1.0 wt%). The rheological, thermal, thermo-gravimetric, and tribological evaluations were co

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Liu, Chang Yong, Lei Zhang, and Fei Yu Kang. "Experimental Study on Heat Transfer Boundary Conditions for Steel Hot Extrusion Process." Advanced Materials Research 668 (March 2013): 856–60. http://dx.doi.org/10.4028/www.scientific.net/amr.668.856.

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Heat transfer boundary conditions have significant influence on the FEM analysis of the steel hot extrusion process using glass lubricant. However, the determination of heat transfer coefficient between billet and tooling lacked experimental basis. In order to obtain rational values of the coefficient, experimental study was conducted to measure it on thermal contact between P92 steel and H13 steel separated by glass lubricant. The influence of contact temperature, contact pressure and lubricant thickness was investigated. The obtained results can provide experimental basis for the determinati

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Arif, Mohammad, Saurabh Kango, and Dinesh Kumar Shukla. "Effect of slip boundary condition and non-newtonian rheology of lubricants on the dynamic characteristics of finite hydrodynamic journal bearing." Surface Topography: Metrology and Properties 10, no. 1 (2022): 015002. http://dx.doi.org/10.1088/2051-672x/ac4403.

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Abstract In the present study, the influence of various slip zone locations on the dynamic stability of finite hydrodynamic journal bearing lubricated with non-Newtonian and Newtonian lubricants has been investigated. Linearized equation of motion with free vibration of rigid rotor has been used to find the optimum location of the slip region with maximum stability margin limit. It has been observed that bearing with interface of slip and no-slip region near the upstream side of minimum film-thickness location is effective in improving the direct and cross stiffness coefficient, critical mass

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Suh, Junho, Changwon Kim, and Je-Heon Han. "Effect of Thermal Boundary Condition on Tilting Pad Journal Bearing Behavior." Applied Sciences 10, no. 21 (2020): 7540. http://dx.doi.org/10.3390/app10217540.

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This research presents the effect of the thermal boundary condition on the tilting pad journal bearing characteristics. The thermal boundary condition includes the temperature around the bearing pad, spinning journal, and lubricant supply temperature. Change in bearing performance according to the temperature around each element constituting the bearing was analyzed without paying attention to how the actual thermal boundary conditions around the bearing are configured. High fidelity numerical model of tilting pad journal bearing is presented for (1) the analysis of heat generation in the thin

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Placek, D. G., and T. Freiheit. "Progress in Vapor Phase Lubrication Technology." Journal of Engineering for Gas Turbines and Power 115, no. 4 (1993): 700–705. http://dx.doi.org/10.1115/1.2906762.

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Improving the efficiency of engine performance will require the design of systems with higher operating temperatures and pressures. These conditions will stress traditional lubricants beyond their current performance capabilities, and require the development of improved methods for friction and wear reduction. The most revolutionary approach to high-temperature lubrication is the concept of vapor phase delivery. An ashless organic compound can be vaporized by the heat of the operating engine or a carrier gas, and introduced into the ring zone of the cylinder. The vapor condenses or chemically

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Malinovskiy, Yu O., O. A. Ilina, D. P. Vlasenkov, S. Yu Oliinyk, and O. O. Mikosianchyk. "Self-organization of the tribosystem under non-stationary conditions of friction from the standpoint of deformation-wave representations." Problems of Tribology 29, no. 3/113 (2024): 15–23. http://dx.doi.org/10.31891/2079-1372-2023-113-3-15-23.

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Mechanisms of structural adaptation of contact surfaces and lubricating materials during friction with the dominance of deformation processes in tribocontact have been analyzed. The purpose of the work was to model the elastic-plastic properties of dissipative structures taking into account the anisotropic properties of the surface layers of the friction pairs and the boundary layers of the lubricating material. The modeling took into account the structural state of the latter formed due to heating and saturation with wear products, along with the physical and mechanical interaction of this la

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Moskalewski, Stanisław, and Ewa Jankowska-Steifer. "Hydrostatic and boundary lubrication of joints; nature of boundary lubricant." Ortopedia Traumatologia Rehabilitacja 14, no. 1 (2012): 13–21. http://dx.doi.org/10.5604/15093492.976894.

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Zhang, Yue, Tai Li Sun, Qi Dong Li, and Xi Chuan Zhang. "A Capillary Model for Gasesas Coolant and Lubricant in Metal Cutting." Key Engineering Materials 458 (December 2010): 167–72. http://dx.doi.org/10.4028/www.scientific.net/kem.458.167.

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The gases of nitrogen, oxygen, argon and carbon dioxide were employed as coolant and lubricant in metal cutting. Therefore, the smaller kinetic diameter of gas, the lower cutting forces can be obtained. A conical capillary model is proposed, based on the experimental results and the theory analysis of stress distributions at the tool-chip interface. According to the boundary-layer theory, the kinetics equations of gas flow were solute. The velocity and flux of gas molecule are presented. In the capillary, the adsorption of tool-chip interface results in boundary lubricating film; the conical s

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Zahid, Rehan, Masjuki Hj. Hassan, Abdullah Alabdulkarem, et al. "Tribological characteristics comparison of formulated palm trimethylolpropane ester and polyalphaolefin for cam/tappet interface of direct acting valve train system." Industrial Lubrication and Tribology 70, no. 5 (2018): 888–901. http://dx.doi.org/10.1108/ilt-06-2017-0156.

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Purpose There is a continuous drive in automotive sector to shift from conventional lubricants to environmental friendly ones without adversely affecting critical tribological performance parameters. Because of their favorable tribological properties, chemically modified vegetable oils such as palm trimethylolpropane ester (TMP) are one of the potential candidates for the said role. To prove the suitability of TMP for applications involving boundary-lubrication regime such as cam/tappet interface of direct acting valve train system, a logical step forward is to investigate their compatibility

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Xu, J., and B. Bhushan. "Friction and durability of ceramic slider materials in contact with lubricated thin-film rigid disks." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 211, no. 4 (1997): 303–16. http://dx.doi.org/10.1243/1350650971542516.

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Slider materials with improved static and kinetic friction and durability of the head-disk interface are required for minimum separation between the head slider and magnetic medium and miniaturization of sliders. Mn-Zn ferrite, calcium titanate, Al2O3-TiC and SiC sliders were used in drag tests, stiction tests and contact start-stop (CSS) tests. The SiC slider exhibits the best tribological performance at all humidities as compared to other sliders. Relevant mechanisms are revealed with measurement of the contact angle of perfluoropolyether (PFPE) lubricants on slider materials, lubricant tran

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Feng, R., K. T. Ramesh, and A. S. Douglas. "An Analytical and Computational Investigation of High-Rate Rheometry." Journal of Tribology 118, no. 3 (1996): 601–7. http://dx.doi.org/10.1115/1.2831579.

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This paper examines a class of experimental techniques used to develop constitutive models for lubricants, by simulating the shearing of a thin lubricant layer while accounting for transient phenomena. The complete transient thermal problem with fully nonlinear constitutive relations is solved, and heat conduction is accounted for both in the lubricant layer and into the walls. Numerical simulations are used to examine the shear stress history, the velocity profile, and the temperature profile as functions of time. As a particular example, the high-rate torsional Kolsky bar rheometer (Feng and

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Hsu, S. M., R. Munro, and M. C. Shen. "Wear in boundary lubrication." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 216, no. 6 (2002): 427–41. http://dx.doi.org/10.1243/135065002762355343.

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Wear is a complex subject. Wear studies under lubricated conditions can be classified into two categories: wear mechanisms study of the materials under ‘lubricated’ conditions, and the evaluation of the lubricant chemistry using the same materials. Much confusion exists in the literature because these two communities historically do not interact frequently to understand each other's views. In the 1980s, material science research was emphasized around the world. As a result, wear studies began to flourish, examining various new materials for potential applications in new technologies. Since new

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Moreno, Karla J., María Teresa Hernández-Sierra, José E. Báez, Eloy Rodríguez-deLeón, Luis Daniel Aguilera-Camacho, and J. Santos García-Miranda. "On the Tribological and Oxidation Study of Xanthophylls as Natural Additives in Castor Oil for Green Lubrication." Materials 14, no. 18 (2021): 5431. http://dx.doi.org/10.3390/ma14185431.

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The present study focuses on an introductory analysis of the use of three xanthophylls as additives for green lubricant applications. For this purpose, the additives were characterized by FTIR and 1H-NMR techniques, and the bio-lubricants were described by their physical properties. The effect of the natural compounds on the friction and wear properties of bio-lubricants were evaluated by sliding friction tests under boundary conditions, as confirmed by an analysis of the lubricating film thickness. The antioxidant capacity was analyzed by FTIR spectroscopy. It was observed better wear protect

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Chen, Wei, Tobias Amann, Andreas Kailer, and Jürgen Rühe. "Macroscopic Friction Studies of Alkylglucopyranosides as Additives for Water-Based Lubricants." Lubricants 8, no. 1 (2020): 11. http://dx.doi.org/10.3390/lubricants8010011.

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Water-based lubricants might become an interesting alternative to conventional oil-based lubricants and help to reduce wear as well as improve the energy efficiency of transport processes. Since pure water is generally a rather poor lubricant due to its low viscosity and corrosiveness, it must be tribologically optimized with suitable additives. Here, we study the friction behavior of alkyl glucopyranosides (AGPs) with varying lengths of the alkyl chain. Sliding experiments show that a significant reduction in the coefficient of friction compared to that of pure water is observed. The extent o

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Guangteng, G., and H. A. Spikes. "Boundary Film Formation by Lubricant Base Fluids." Tribology Transactions 39, no. 2 (1996): 448–54. http://dx.doi.org/10.1080/10402009608983551.

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Sarma, A. V., G. L. Powell, and M. LaBerge. "Phospholipid composition of articular cartilage boundary lubricant." Journal of Orthopaedic Research 19, no. 4 (2001): 671–76. http://dx.doi.org/10.1016/s0736-0266(00)00064-4.

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Yi, Xiaohua, Karen Nerbonne, and John Pellegrino. "Diffusion Measurements Using FT-IR ATR Spectroscopy: Lubricant Diffusion in Polypropylene." Applied Spectroscopy 56, no. 4 (2002): 509–14. http://dx.doi.org/10.1366/0003702021954962.

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We present an experimental method for measuring diffusion of lubricants (or any highly viscous fluid) in polymers using Fourier transform infrared (FT-IR) attenuated total reflection (ATR) spectroscopy. Unlike the conventional FT-IR ATR diffusion measurement, in which a polymer sample is sandwiched between the penetrant and an internal reflection element (IRE), in this method, a thin layer of penetrant (for example, a lubricant) is sandwiched between the IRE and the polymer sample. This allows accurate control and measurement of the thickness of the lubricant layer, which, in turn, facilitates

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Omrani, Emad, Arpith Siddaiah, Afsaneh Dorri Moghadam, Uma Garg, Pradeep Rohatgi, and Pradeep L. Menezes. "Ball Milled Graphene Nano Additives for Enhancing Sliding Contact in Vegetable Oil." Nanomaterials 11, no. 3 (2021): 610. http://dx.doi.org/10.3390/nano11030610.

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Graphite nanoplatelets (GNPs) as an oil nano additive has gained importance to enhance the lubrication properties of renewable lubricants, such as vegetable oils. Using appropriately processed GNPs is necessary to gain the required tribological advantage. The present study investigated ball-milled GNPs, to understand the effect of GNPs concentration, and applied load on tribological behavior. Pin-on-disk tests were employed, to investigate the tribological performance of the nano-additive oil-based lubricant in the boundary lubrication regime. In order gain an understanding of the lubrication

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Gilmour, K. R., S. Paul, and A. G. Leacock. "The Influence of Lubricant Film Thickness on Friction Coefficients During Slow Speed Deep Drawing Operations." Journal of Tribology 124, no. 4 (2002): 846–51. http://dx.doi.org/10.1115/1.1330732.

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During some deep drawing operations liquid lubricants are used under the blankholder to reduce friction coefficients. Under the clamping action of the blankholder, lubricants will be squeezed out resulting in a changing film thickness after the initial application of the blankholder load. A relationship between kinetic friction coefficient values and the loading duration of the blankholder can be observed from analysis of results recorded during simulative testing. By using a numerical model to combine empirical measurements, friction coefficients during boundary lubrication, lubricant film th

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Williams, P. F., G. L. Powell, and M. LaBerge. "Sliding Friction Analysis of Phosphatidylcholine as a Boundary Lubricant for Articular Cartilage." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 207, no. 1 (1993): 59–66. http://dx.doi.org/10.1243/pime_proc_1993_207_268_02.

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Dipalmitoyl phosphatidylcholine (DPPC), the major lipidic component of the synovial fluid (45 per cent), has been implicated in previous studies in synovial joint lubrication as a potential boundary lubricant for articular cartilage. The purpose of this study was to evaluate the effectiveness of DPPC as a boundary lubricant at physiological stresses experienced by weight-bearing joints (up to 7.5 MPa). The sliding coefficients of static and kinetic friction for glass surfaces coated with DPPC layers of physiological thickness (70 nm) were measured as a function of average contact stress, conta

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Taylor, RI, N. Morgan, R. Mainwaring, and T. Davenport. "How much mixed/boundary friction is there in an engine — and where is it?" Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 10 (2019): 1563–79. http://dx.doi.org/10.1177/1350650119875316.

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Automotive engines are believed to operate predominantly in the hydrodynamic regime, as evidenced by the (1) the successful strategy of reducing lubricant viscosity to reduce engine friction and improve vehicle fuel consumption, and (2) for most engine operating conditions, direct measurements of engine friction (either motored or fired) find that engine friction increases with increasing engine speed. However, certain components in an engine are known to operate mainly in the mixed/boundary lubrication (e.g. the valve train) and other components (such as the piston rings) operate in the mixed

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Costa, Henara Lillian, Tiago Cousseau, and Roberto Martins Souza. "Current Knowledge on Friction, Lubrication, and Wear of Ethanol-Fuelled Engines—A Review." Lubricants 11, no. 7 (2023): 292. http://dx.doi.org/10.3390/lubricants11070292.

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The urgent need for drastic reduction in emissions due to global warming demands a radical energy transition in transportation. The role of biofuels is fundamental to bridging the current situation towards a clean and sustainable future. In passenger cars, the use of ethanol fuel reduces gas emissions (CO2 and other harmful gases), but can bring tribological challenges to the engine. This review addresses the current state-of-the-art on the effects of ethanol fuel on friction, lubrication, and wear in car engines, and identifies knowledge gaps and trends in lubricants for ethanol-fuelled engin

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