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Lubricants
Special Issues
Recent Advances in Lubricated Tribological Contacts
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Recent Advances in Lubricated Tribological Contacts

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 31 January 2025 | Viewed by 2003

Special Issue Editors

Dr. Marcus Björling

E-Mail Website
Guest Editor
Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
Interests: contact mechanics; tribology; elastohydrodynamic lubrication
Special Issues, Collections and Topics in MDPI journals
Dr. Deepak K. Prajapati

E-Mail Website
Guest Editor
Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
Interests: machine learning in tribology; numerical modeling of wear; rolling contact fatigue

Special Issue Information

Dear Colleagues,

In the 21st century, applications of tribology can be observed in many fields, such as automotives, biomechanics, manufacturing, renewable energy, aviation, healthcare, transportation, and many more in daily human activities. In general, two types of lubricated tribological contacts are found: conformal and counterformal (non-conformal or concentrated) in various machine elements, for instance, gears, seals, hip and knee joints, bearings (rolling element bearings and journal bearings), cam/followers, piston/ring liner conjunctions, etc. Primarily, these machine components are lubricated using solid or liquid lubricants to reduce friction and wear and, consequently, increase energy efficiency and the service life of machine components. Due to the large progress in modern computer efficiency, tribological contacts nowadays can be successfully analyzed by performing macro-to-atomic-level simulations. Recent advances in the analysis of aforementioned tribological contacts include, but are not limited to: (a) the use of AI/ML for the analysis of lubricated tribological contacts; (b) the development of novel coatings, textures, and heat treatment methods; (c) the analysis of lubricated tribological contacts under the influence of electric current or electrical discharge; and (d) the development of sustainable liquid lubricants to enhance the efficiency of tribological contacts.

This Special Issue deals with recent advances in lubricated tribological contacts and papers dealing with the aforementioned topics or related topics that can increase the knowledge of lubricated tribological mechanisms. Contributions from both academic and industrial research are welcome.

We are looking forward to receiving your submissions.

Dr. Marcus Björling
Dr. Deepak K. Prajapati
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • lubricated tribological contacts
  • rough contact mechanics
  • coatings
  • tribology
  • lubrication

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Published Papers (3 papers)

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Research

25 pages, 10155 KiB  
Article
Effect of Surface Roughness on the Friction Moment in a Lubricated Deep Groove Ball Bearing
by Harsh Kumar, Vaibhav Gupta, Velamala Bharath, Mayank Tiwari, Surajit Kumar Paul, Lokesh Agrawal, Arendra Pal Singh and Ayush Jain
Lubricants 2024, 12(12), 443; https://doi.org/10.3390/lubricants12120443 - 11 Dec 2024
Abstract
Deep groove ball bearings (DGBBs) are extensively utilized in industrial machinery, mechanical systems, and household appliances due to their simple design, low maintenance, and ability to operate at high speeds. A critical issue in the performance of these bearings is the power loss [...] Read more.
Deep groove ball bearings (DGBBs) are extensively utilized in industrial machinery, mechanical systems, and household appliances due to their simple design, low maintenance, and ability to operate at high speeds. A critical issue in the performance of these bearings is the power loss by internal friction torque, which adversely affects system efficiency, longevity, and reliability, particularly in demanding applications such as aviation and marine systems. The friction torque in DGBBs is influenced by factors such as load, speed, surface roughness, and lubricant viscosity, making the precise understanding of these elements essential for optimizing system efficiency. Despite its significance, the effect of surface roughness on friction torque in DGBBs remains underexplored. This paper presents an analytical model to evaluate the frictional moments resulting from interactions between the ball–race and ball–cage in lubricated, low-speed DGBBs. This model employs a mixed elastohydrodynamic lubrication approach to determine the friction coefficient at the contact interfaces. This study explores how surface roughness and speed affect both ball–race and ball–cage friction torque, offering a comprehensive analysis of their influence on overall frictional torque. Additionally, the effect of surface roughness on ball–cage contact forces is investigated, enhancing the understanding of its contribution to friction torque. These insights aim to improve DGBB design and operation, maximizing performance and energy efficiency. Full article
(This article belongs to the Special Issue Recent Advances in Lubricated Tribological Contacts)
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10 pages, 2799 KiB  
Article
The Temperature Dependence of Divergence Pressure
by Scott Bair
Lubricants 2024, 12(12), 434; https://doi.org/10.3390/lubricants12120434 - 6 Dec 2024
Viewed by 356
Abstract
The so-called controversy in elastohydrodynamic lubrication (EHL) regarding the nature of the shear dependence of viscosity, Eyring versus Carreau, is truly a controversy regarding the pressure and temperature dependence of low-shear viscosity. Roelands removed data that contradicted his claims of accuracy for his [...] Read more.
The so-called controversy in elastohydrodynamic lubrication (EHL) regarding the nature of the shear dependence of viscosity, Eyring versus Carreau, is truly a controversy regarding the pressure and temperature dependence of low-shear viscosity. Roelands removed data that contradicted his claims of accuracy for his correlation. The Roelands hoax became acceptable in EHL because ignoring the universal previtreous piezoviscous response made the traction calculated with the Eyring assumption appear to be reasonable. Traction and minimum film thickness calculations sometimes require the description of viscosity at pressures up to the glass transition pressure. There have been few measurements of viscosity at pressures up to glass pressure. Therefore, a need exists for a piezoviscous model that extrapolates accurately, and the Hybrid model fills that need. Here, an improved relation for the temperature dependence of divergence pressure is offered and extrapolation is demonstrated for a polyalphaolefin and propylene carbonate. A linear dependence of divergence pressure with temperature is more useful than previous versions. An improvement in the capability of high-pressure viscometry is suggested based upon the fractional Stokes Einstein Debye relation and the relatively simple measurements of DC conductivity. Full article
(This article belongs to the Special Issue Recent Advances in Lubricated Tribological Contacts)
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21 pages, 7163 KiB  
Article
Tribological Performance of Glycerol-Based Hydraulic Fluid Under Low-Temperature Conditions
by Paul Okhiria, Marcus Björling, Pontus Johansson, Mushfiq Hasan, Roland Larsson and Yijun Shi
Lubricants 2024, 12(12), 430; https://doi.org/10.3390/lubricants12120430 - 4 Dec 2024
Viewed by 458
Abstract
This study evaluated the tribological performance of a glycerol-based hydraulic fluid as a green alternative to conventional mineral-based hydraulic lubricants under low-temperature conditions, down to −20 °C. The performance of the glycerol hydraulic fluid (GHF) was compared against that of a mineral hydraulic [...] Read more.
This study evaluated the tribological performance of a glycerol-based hydraulic fluid as a green alternative to conventional mineral-based hydraulic lubricants under low-temperature conditions, down to −20 °C. The performance of the glycerol hydraulic fluid (GHF) was compared against that of a mineral hydraulic fluid (MHF) using an SRV tribometer for steel-to-steel sliding contact under boundary lubrication conditions. Comparisons were also made at a moderate temperature to assess the fluids’ performance across different thermal conditions. The results show that the GHF demonstrated up to 55% lower friction coefficients under various test conditions than the MHF. With wear volumes up to 90% lower, the GHF produced thinner and less intense wear scars on the test discs compared to the deeper and more pronounced scars observed with the MHF. We conducted rheological tests which also revealed the green fluid’s stable viscosity transition with temperature changes and its Newtonian behaviour under the measured shear conditions, which may indicate its ability to maintain consistent lubrication. Full article
(This article belongs to the Special Issue Recent Advances in Lubricated Tribological Contacts)
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