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Lubricants
Special Issues
Frictional and Wear Behaviors of Sliding Interfaces across Scales
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Frictional and Wear Behaviors of Sliding Interfaces across Scales

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

Deadline for manuscript submissions: closed (15 December 2023) | Viewed by 10120

Special Issue Editors

Dr. Chen Xiao

E-Mail
Guest Editor
Advanced Research Center for Nanolithography, Science Park 106, 1098XG Amsterdam, The Netherlands
Interests: nanotriboligy; mechanochemistry; electrochemistry
Special Issues, Collections and Topics in MDPI journals
Dr. Yunhai Liu

E-Mail Website
Guest Editor
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
Interests: coatings; friction; wear; tribology
Dr. Peng Zhang

E-Mail Website
Guest Editor
School of Mechanical Engineering, Sichuan University, Chengdu 610065, China
Interests: nanotribology; surface manufacturing; cold plasma

Special Issue Information

Dear Colleagues,

Tribology is the science of wear, friction, and lubrication, and encompasses how interacting surfaces behave in relative motion in natural and artificial systems. The tribological properties are highly scale dependent. At nanoscale, the research focuses on atomistic interface interactions, single asperity dissipative processes, wear initiation, and evolution, etc. At mesoscale, friction and wear behaviors are mainly dominated by surface roughness effects, micro-slip, subsurface cracking, nucleation processes, instabilities, etc. At macroscale, engineering tribology concerns lubrication surface coatings and wear resistant materials for minimum wear, and sacrificial materials and surface finishing process (such as grinding and polishing) for maximum wear based on the specific engineering applications. Except for the above, there are some special frictional phenomena in natural systems, such as earthquakes, avalanches, glaciers, and land slides.

The key topic of the Special Issue is friction and wear across all length scales. The focus is on the physical, mechanical and chemical properties and the fundamental governing laws underlying these processes, as well as their applications on relevant engineering problems.

Dr. Chen Xiao
Dr. Yunhai Liu
Dr. Peng Zhang
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

  • friction
  • wear
  • tribology
  • (super)lubricity
  • anti-wear
  • lubricants
  • additives
  • modeling
  • simulation

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Published Papers (5 papers)

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Research

18 pages, 5907 KiB  
Article
Influence of Nanoparticles in Lubricant on Sliding Contact of Atomic Rough Surfaces—A Molecular Dynamics Study
by Xuan Zheng, Lihong Su and Guanyu Deng
Lubricants 2024, 12(5), 160; https://doi.org/10.3390/lubricants12050160 - 6 May 2024
Cited by 1 | Viewed by 1863
Abstract
In this work, large-scale molecular dynamics (MD) computational simulations were performed in order to explore the sliding contact responses of rough surfaces with hexadecane lubricant and added nanoparticles. Simulation results revealed that the frictional state was dependent on the fluid, nanoparticle, and surface [...] Read more.
In this work, large-scale molecular dynamics (MD) computational simulations were performed in order to explore the sliding contact responses of rough surfaces with hexadecane lubricant and added nanoparticles. Simulation results revealed that the frictional state was dependent on the fluid, nanoparticle, and surface roughness. Three lubricating conditions were compared based on considerations of different amounts of fluid molecules. The lubricant was not able to separate the frictional contact surfaces if the quantity of lubricant molecules was insufficient. Particularly, there were no lubricating contributions when the amount of lubricant was too low, and the lubricant therefore only filled the pits in the surface roughness. Thus, the normal load was primarily supported by the contact between the two surfaces and nanoparticles, leading to significant surface morphology changes. In contrast, the frictional contact surfaces were able to be completely separated by the lubricant when there was a sufficient amount of fluid, and a very good lubricating effect could thus be achieved, resulting in a smaller friction force. In addition, the changes in surface morphology, contact area, and RMS are discussed in this paper, in order to reveal the dynamic frictional process. Full article
(This article belongs to the Special Issue Frictional and Wear Behaviors of Sliding Interfaces across Scales)
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18 pages, 7248 KiB  
Article
Friction Performance of Rubber Sealing Disc Inside Pipe Robots for the Production of High-Paraffin Oil
by Guibin Tan, Ziwei Luo, Yifan Ji and Xing Huang
Lubricants 2024, 12(3), 102; https://doi.org/10.3390/lubricants12030102 - 20 Mar 2024
Viewed by 1538
Abstract
The in-pipe robot is the most commonly used technique in offshore pipelines. The use of rubber sealing discs is important for in-pipe robots to ensure that the robots are moved by fluid pressures inside offshore pipelines. This paper focuses on the measuring and [...] Read more.
The in-pipe robot is the most commonly used technique in offshore pipelines. The use of rubber sealing discs is important for in-pipe robots to ensure that the robots are moved by fluid pressures inside offshore pipelines. This paper focuses on the measuring and modeling of the wax–oil gel-breaking process at the soft frictional area between sealing discs and the pipe wall. In this study, a detailed characterization of the gel-scraping process and in situ probing portable microscopy are performed. Two contributions are made in this study. First, a direct observation of wax–oil deposition breaking is employed to detect the minute changes at the in-pipe robot. Second, we find that a simple function is possible to describe the relationship between the wax contents and dewaxing efficiency, in which the debris material removal ratio (DRR) is discussed. Thus, the gel deposition-breaking phenomena are quite different under the influence of rubber sealing discs. This result is further confirmed by the real contact ratio measurements. It is important to research the sealing disc further and apply it more in the petroleum industry, especially in in-pipe robots for deepwater pipeline systems. Full article
(This article belongs to the Special Issue Frictional and Wear Behaviors of Sliding Interfaces across Scales)
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16 pages, 7360 KiB  
Article
Reducing Wheel Loading in the Grinding of Titanium Alloys through Ultrasonic-Assisted Plasma Oxidation Modification
by Hanqiang Wu, Ximin Ye, Zhuo Chen, Shibo Zhang, Jiang Zeng, Qiang Wang and Yongbo Wu
Lubricants 2023, 11(9), 397; https://doi.org/10.3390/lubricants11090397 - 12 Sep 2023
Cited by 1 | Viewed by 1279
Abstract
To reduce wheel loading caused by chip adhesion in the grinding of titanium alloys, a new method named ultrasonic-assisted plasma oxidation modification grinding is suggested. The processing principle was introduced in this research, and based on that, the experimental apparatus was established. Then, [...] Read more.
To reduce wheel loading caused by chip adhesion in the grinding of titanium alloys, a new method named ultrasonic-assisted plasma oxidation modification grinding is suggested. The processing principle was introduced in this research, and based on that, the experimental apparatus was established. Then, the surface and cross-sectional morphologies of a workpiece with an oxide layer were characterized, followed by the detection of its microhardness and surface composition. On this basis, in the absence and presence of the oxide layer, the dynamic changes in wheel loading on the grinding wheel surface and the evolution behavior of chip adhesion on the grains were both investigated after gradually increasing the grinding passes. Finally, the effects of wheel loading on the ground surface morphologies were analyzed. The results showed that the oxide layer with low microhardness was mainly composed of TiO2 and Al2O3. Moreover, with an increase in grinding passes, the overall occupied area of chip adhesion on the grinding wheel surface increased proportionally in the absence of the oxide layer, which finally caused severe wheel loading. Conversely, yet at almost the same rate, the overall occupied area of chip adhesion increased after remaining comparatively unchanged in a short range of grinding passes in the presence of the oxide layer, which effectively inhibited the wheel loading. Compared with the ground surface obtained without an oxide layer, the generation of plastic-stacking was significantly restrained with the assistance of the oxide layer, thereby improving the ground surface quality. Full article
(This article belongs to the Special Issue Frictional and Wear Behaviors of Sliding Interfaces across Scales)
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16 pages, 9712 KiB  
Article
Effect of Two Graphene Coatings on the Friction and Wear of Sliding Electrical Contact Interface
by Dongwei Wang, Faqiang Li, Xiao Chen, Huaqiao Li, Wei Chen and Peng Zhang
Lubricants 2022, 10(11), 305; https://doi.org/10.3390/lubricants10110305 - 12 Nov 2022
Cited by 6 | Viewed by 1877
Abstract
Two kinds of graphene coatings are obtained by the graphene drop-coating drying method (DCDM) and the coating graphene conductive adhesive (CGCA). The effects of these two kinds of graphene coatings on the friction, wear, and voltage signals of the electrical contact interface are [...] Read more.
Two kinds of graphene coatings are obtained by the graphene drop-coating drying method (DCDM) and the coating graphene conductive adhesive (CGCA). The effects of these two kinds of graphene coatings on the friction, wear, and voltage signals of the electrical contact interface are explored. The test results show that the presence of the graphene coating can effectively reduce the friction coefficient and friction force, and the graphene coating prepared by the DCDM possesses the best ability in reducing the friction coefficient. Although the presence of the graphene coating will lead to the increase in interface contact voltage at the initial stage, the voltage signal gradually becomes stable with the progress of friction and wear, suggesting that the graphene coating will not affect the stability of sliding electrical contact. Wear analysis results show that the graphene coating prepared by the DCDM has a good anti-wear effect, and the graphene particles in the abrasion area play the role of solid lubrication. Finite element analysis results show that the graphene coating will generate thermal expansion when electric current is applied, accordingly avoid the direct contact between the metal substrate, and, thus, reduce the interface friction and alleviate the wear degree of interface. However, the normal force fluctuation of the interface may increase. Full article
(This article belongs to the Special Issue Frictional and Wear Behaviors of Sliding Interfaces across Scales)
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23 pages, 13320 KiB  
Article
A Stress-State-Dependent Thermo-Mechanical Wear Model for Micro-Scale Contacts
by Jamal Choudhry, Roland Larsson and Andreas Almqvist
Lubricants 2022, 10(9), 223; https://doi.org/10.3390/lubricants10090223 - 14 Sep 2022
Cited by 8 | Viewed by 2693
Abstract
Wear is a complex phenomenon that depends on the properties of materials and their surfaces, as well as the operating conditions and the surrounding atmosphere. At the micro-scale, abrasive wear occurs as material removal due to plastic deformation and fracture. In the present [...] Read more.
Wear is a complex phenomenon that depends on the properties of materials and their surfaces, as well as the operating conditions and the surrounding atmosphere. At the micro-scale, abrasive wear occurs as material removal due to plastic deformation and fracture. In the present work, it is shown that fracture is stress-state-dependent and thus should be accounted for when modelling wear. For this reason, a three-dimensional finite element model has been adopted to simulate and study the main mechanisms that lead to wear of colliding asperities for a pair of metals. The model is also fully coupled with a non-linear thermal solver to account for thermal effects such as conversion of plastic work to heat as well as thermal expansion. It is shown that both the wear and flash temperature development are dependent on the stress triaxiality and the Lode parameter. Full article
(This article belongs to the Special Issue Frictional and Wear Behaviors of Sliding Interfaces across Scales)
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