Article
Engineering, Mechanical
Daofei Wang, Jialong Yang, Pengchong Wei, Wei Pu
Summary: This article focuses on the application of grease lubrication in rolling element bearings and the establishment of a mixed EHL model. Experimental results show that the grease friction behavior corresponds well with the variation of grease film thickness.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
H. P. Evans, R. W. Snidle
Summary: Duncan Dowson's groundbreaking contribution to elastohydrodynamic lubrication theory has had a significant impact on the understanding of lubrication in gear tooth contacts and provided a reliable reference formula in gear design standards. This paper demonstrates the application of elastohydrodynamic lubrication theory in engineering component design and highlights the importance of considering surface roughness effects in micro-elastohydrodynamic lubrication for addressing current issues like micropitting.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Tao He, Q. Jane Wang, Xin Zhang, Yuchuan Liu, Zhe Li, Hun June Kim, Seongchan Pack
Summary: This paper introduces a novel visco-elastohydrodynamic lubrication model for studying the lubrication behavior between a rigid sphere and a viscoelastic layer on an elastic half-space. The model is validated through comparisons with experimental data, confirming its effectiveness in predicting lubrication performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Marius Wolf, Sergey Solovyev, Fatemi Arshia
Summary: Analytical equations for central film thickness in slender elliptic contacts were investigated in this paper, with a new formula derived to be significantly more accurate than current equations. Experimental studies and discussions on minimum film thickness will be presented in a subsequent publication.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2022)
Article
Engineering, Chemical
Wassim Habchi, Philippe Vergne
Summary: The study introduces a quantitative method for predicting minimum film thickness in elastohydrodynamic-lubricated circular contacts based on central film thickness. Comparison with traditional film thickness formulae and recent expressions revealed the former's inability and the latter's tendency to overestimate the central-to-minimum film thickness ratio. The proposed approach was validated against numerical and experimental data, showing excellent agreement.
Article
Engineering, Mechanical
Donglong Li, Chen Zhu, Anying Wang, Tao He
Summary: This paper develops a semi-analytical model using the numerical equivalent inclusion method (EIM) and fast Fourier transforms (FFT) to analyze the viscoelastohydrodynamic lubrication (VEHL) behavior of polymer-based composites. The model investigates the viscoelastic behavior of these composites under different relaxation times and analyzes the influence of inhomogeneities on contact pressure and film thickness, as well as the stress fields caused by multiple voids and hollow spheres.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Georges Amine, Nicolas Fillot, David Philippon, Nicolas Devaux, Johnny Dufils, Etienne Macron
Summary: This study presents a dual experimental-numerical approach to investigate oil film thickness and friction in a wide elliptical TEHL contact under different sliding conditions. The experimental results show different trends of film thickness variation for different slide-to-roll ratios. The numerical model accurately predicts film thickness and friction behavior under a wide range of sliding conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Chemical
W. Habchi, P. Sperka, S. Bair
Summary: This study investigates the governing mechanisms of minimum film thickness in elastohydrodynamic lubricated contacts. It is found that lubricant inlet rheology only governs the minimum film thickness in the theoretical line contact configuration, while in real contacts, it is also influenced by the high-pressure viscosity response of the lubricant. The study confirms that a higher viscosity at high pressure leads to a lower minimum film thickness, in line with experimental observations.
Article
Engineering, Mechanical
Mingyu Zhang, Minglu Yao, Jing Wang, Yong Wan
Summary: To improve mechanical efficiency, the tribological performance of short-period intermittent motion is investigated. A mixed-EHL model under point contact simple sliding intermittent motion is established, considering the influences of rough surface. The transition from mixed-EHL to EHL is realized by changing the period of intermittent motion and setting the surface roughness. The thermal effect on simple sliding intermittent motion is significant and should not be ignored. The contact area enters the mixed-EHL state during stop and start-up, especially under rough surface contact. Shortening the period of intermittent motion helps alleviate the adverse effect of mixed-EHL.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Yuechang Wang, Abdel Dorgham, Ying Liu, Chun Wang, Mark C. T. Wilson, Anne Neville, Abdullah Azam
Summary: The study found that the stability and accuracy of mixed lubrication simulations are significantly influenced by the choice of solution schemes, which can also be used for qualitative and parametric studies.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Chemical
Jonny Hansen, Marcus Bjorling, Roland Larsson
Summary: A new film parameter Lambda* was proposed in this study, taking into account the elasto-hydrodynamic lubrication effects induced by surface irregularities on the microscopic scale. The new model was validated through tribological tests and found to accurately predict the experimentally measured true mixed and full-film EHL regimes. The ability to accurately predict the mode of lubrication represents a major advance in designing tribological interfaces for optimal efficiency and durability.
Article
Engineering, Mechanical
Kazuyuki Yagi, Kazuki Nishida, Joichi Sugimura
Summary: This study investigates the traction behaviors of lubricant films with anomalous shapes under elastohydrodynamic lubrication conditions. Lubricants with anomalous film shapes exhibit solid-like behavior with sharp traction peaks at low slide-to-roll ratios, while lubricants with conventional film shapes show a gradual increase in traction coefficient with increasing slide-to-roll ratios. The similarity of traction behavior to that of traction fluids supports the solidification of films with anomalous shapes.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Multidisciplinary Sciences
Yanzhong Wang, Kai Yang, Xiaomeng Chu, Wen Tang, Changyong Huang
Summary: An engineering calculation model is introduced to analyze point-contact elastohydrodynamic lubrication of spiral bevel gears, revealing the transient lubrication characteristics and film thickness variations during the meshing process.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Mechanical
Sen Jiang, Hua Ji, Qi Liu, Jiawei Wang, Jingwei Hu, Guangneng Dong
Summary: A 2D elastohydrodynamic numerical analysis is conducted to investigate the performance of a rotary lip seal with a textured shaft. The results show that the texture effects can reshape the lip surface and reduce the contact pressure.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Y. Zhao, H. C. Liu, G. E. Morales-Espejel, C. H. Venner
Summary: In this study, the problem of viscoelastic solid lubricated point contact was investigated, and an efficient numerical algorithm was developed. Experimental results showed that the viscoelastic solid has significant effects on the film and pressure behavior in highly deformed lubricated contacts.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Huiyi Yang, Yang Xu, Chao Xu
Summary: This study focuses on the impact of dry friction interfaces on the dynamics of jointed structures, particularly on the statistics of contact pressure distribution. Through experimental and simulation analysis, it is found that surface roughness and contact load have significant effects on contact area, contact stiffness, and mean contact pressure.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Guanglan Hu, Houfu Dai
Summary: The effect of metal coating on the machinability of cubic silicon carbide was investigated using molecular dynamics simulation. The results showed that the type of coating has a significant impact on cutting force, surface morphology, stress, and tool wear. Among the three metals studied, Cu coating had the greatest impact on improving cutting performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yunfan Liu, Guozheng Ma, Lina Zhu, Cuihong Han, Zhen Li, Bin Zhang, Haichao Zhao, Haidou Wang, Shuying Chen
Summary: The service performance of coated self-lubricating spherical plain bearings can be improved by applying self-lubricating coatings, especially double-sided coatings. The presence of a large-area and complete mixed friction transfer film on the contact surfaces can cause a signal downstage before the signal mutation stage.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yakup Artun, C. Oktay Azeloglu, Gokhan Taylan
Summary: This article investigates the tribological properties of polymer journal bearings, particularly focusing on radial journal bearings made from UHMWPE and POM materials with different surface qualities. The study examines the performance of these bearings under varying load and speed conditions, and analyzes the relationship between material and surface roughness in tribological performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)