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Lubricants
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State-of-the-Art of Tribology in North America
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State-of-the-Art of Tribology in North America

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

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 2128

Special Issue Editors

Dr. Jun Qu

E-Mail Website
Guest Editor
Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831-6063, USA
Interests: advanced lubrication for energy efficiency; surface engineering for wear and corrosion protection; nanostructured energy materials; nuclear tribology; advanced manufacturing
Special Issues, Collections and Topics in MDPI journals
Dr. Xin He

E-Mail Website
Guest Editor
Solvay USA Inc., 350 George Patterson Blvd, Bristol, PA 19007, USA
Interests: surface science; environmentally friendly lubricant; tribochemistry; ionic liquid; high-temperature tribology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In 1493, Leonardo da Vinci noted the laws of friction, marking the beginning of the modern age of tribology. Tribology has seen great advances in the 20th century and had a significant impact on our lives, from transportation to industrial machinery with improved mobility and durability. The recent development of numerous new lubricants and materials as well as modeling capabilities provides new opportunities for energy savings and environmental impact reductions. Tribology R&D is estimated to save 1 quad of energy annually. The field of tribology is continually evolving, and because of its interdisciplinary nature, current research takes advantage of advanced technologies in materials and surface characterization, nanostructured materials, molecular dynamics simulation, and AI/ML approaches. With the fast-growing field of electric vehicles and additive manufacturing, tribology is facing unprecedented challenges and opportunities.

North America has been at the forefront of tribology R&D. Researchers and engineers from academia, industry, and national labs have been collaboratively developing innovative and customized solutions for both tribology fundamentals and applications. We welcome all the tribologists from North America to contribute to this Special Issue to present the latest achievements in either experiments or modeling.

Dr. Jun Qu
Dr. Xin He
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

  • lubricants
  • coatings
  • nanotribology
  • artificial intelligence
  • electric vehicles
  • manufacturing

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Published Papers (1 paper)

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Research

22 pages, 6995 KiB  
Article
Novel Process Modeling of Magnetic-Field Assisted Finishing (MAF) with Rheological Properties
by Bibek Poudel, Hoa Nguyen, Guangchao Song, Patrick Kwon and Haseung Chung
Lubricants 2023, 11(6), 239; https://doi.org/10.3390/lubricants11060239 - 27 May 2023
Cited by 2 | Viewed by 1579
Abstract
The performance of a magnetic-field-assisted finishing (MAF) process, an advanced surface finishing process, is severely affected by the rheological properties of an MAF brush. The yield stress and viscosity of the MAF brush, comprising iron particles and abrasives mixed in a liquid carrier [...] Read more.
The performance of a magnetic-field-assisted finishing (MAF) process, an advanced surface finishing process, is severely affected by the rheological properties of an MAF brush. The yield stress and viscosity of the MAF brush, comprising iron particles and abrasives mixed in a liquid carrier medium, change depending on the brush’s constituents and the applied magnetic field, which in turn affect the material removal mechanism and the corresponding final surface roughness after the MAF. A series of experiments was conducted to delineate the effect of MAF processing conditions on the yield stress of the MAF brush. The experimental data were fitted into commonly used rheology models. The Herschel–Bulkley (HB) model was found to be the most suitable fit (lowest sum of square errors (SSE)) for the shear stress–shear rate data obtained from the rheology tests and used to calculate the yield stress of the MAF brush. Processing parameters, such as magnetic flux density, weight ratio of iron and abrasives, and abrasive (black ceramic in this study) size, with p-values of 0.031, 0.001 and 0.037, respectively, (each of them lower than the significance level of 0.05), were all found to be statistically significant parameters that affected the yield stress of the MAF brush. Yield stress increased with magnetic flux density and the weight ratio of iron to abrasives in MAF brush and decreased with abrasive size. A new process model, a rheology-integrated model (RM), was formulated using the yield stress data from HB model to determine the indentation depth of individual abrasives in the workpiece during the MAF process. The calculated indentation depth enabled us to predict the material removal rate (MRR) and the instantaneous surface roughness. The predicted MRR and surface roughness from the RM model were found to be a better fit with the experimental data than the pre-existing contact mechanics model (CMM) and wear model (WM) with a R2 of 0.91 for RM as compared to 0.76 and 0.78 for CMM and WM. Finally, the RM, under parametric variations, showed that MRR increases and roughness decreases as magnetic flux density, rotational speed, weight ratio of iron to abrasive particles in MAF brush, and initial roughness increase, and abrasive size decreases. Full article
(This article belongs to the Special Issue State-of-the-Art of Tribology in North America)
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