Special Issue "Entropy Application in Tribology"

A special issue of Entropy (ISSN 1099-4300).

Deadline for manuscript submissions: closed (31 January 2017).

Special Issue Editor

Prof. Dr. Michael M. Khonsari
E-Mail Website
Guest Editor
Department of Mechanical Engineering, 2508 Patrick Taylor Hall, Louisiana State University, Baton Rouge, LA 70803, USA
Interests: tribology; fatigue analysis; heat transfer

Special Issue Information

Dear Colleagues,

Research on the application of non-equilibrium thermodynamics to tribology has a rich history that, according to [1], began in Russia in the 1970s and, as described by Bryant, offers a framework to unify friction and wear [2]. Today, there is a growing interest in this field, as its potentials are being explored by different researchers around the globe. Examples range from applications to friction and wear to both steady state and transient phenomena in trio-components, such as running-in, tribo-fatigue, damage analysis, monitoring the heath, aging and degradation of lubricants, and the fascinating concept of self-organization in the friction pair.

These are diverse topics of interest to the community, and potential authors are invited to contribute their research for publication consideration in this Special Issue of Entropy.

[1] Michael Nosonovsky. Entropy in Tribology: In the Search for Applications. Entropy 2010, 12, 1345–1390.

[2] Michael Bryant. Unification of Friction and Wear. In Recent Developments in Wear Prevention, Friction and Lubrication; Nikas, G., Ed.; Research Signpost, Kerala, India, 2010; ISBN: 978-81-308-0377-7.

Prof. Dr. Michael M. Khonsari
Guest Editor

Manuscript Submission Information

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Keywords

  • Friction, corrosion and Wear
  • Running-in and stick slip
  • Tribo-Fatigue
  • Lubrication degradation and aging
  • Damage analysis and fracture
  • Monitoring techniques for evaluating wear, damage, and degradation
  • Self-healing and self-organization
  • Relevant theoretical modeling, simulations, and experimental techniques

Published Papers (6 papers)

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Research

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Open AccessArticle
A Model of Mechanothermodynamic Entropy in Tribology
Entropy 2017, 19(3), 115; https://doi.org/10.3390/e19030115 - 14 Mar 2017
Cited by 8
Abstract
A brief analysis of entropy concepts in continuum mechanics and thermodynamics is presented. The methods of accounting for friction, wear and fatigue processes in the calculation of the thermodynamic entropy are described. It is shown that these and other damage processes of solids [...] Read more.
A brief analysis of entropy concepts in continuum mechanics and thermodynamics is presented. The methods of accounting for friction, wear and fatigue processes in the calculation of the thermodynamic entropy are described. It is shown that these and other damage processes of solids are more adequately described by tribo-fatigue entropy. It was established that mechanothermodynamic entropy calculated as the sum of interacting thermodynamic and tribo-fatigue entropy components has the most general character. Examples of usage (application) of tribo-fatigue and mechanothermodynamic entropies for practical analysis of wear and fatigue processes are given. Full article
(This article belongs to the Special Issue Entropy Application in Tribology)
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Open AccessArticle
Description of Seizure Process for Gas Dynamic Spray of Metal Powders from Non-Equilibrium Thermodynamics Standpoint
Entropy 2016, 18(9), 315; https://doi.org/10.3390/e18090315 - 25 Aug 2016
Cited by 3
Abstract
The seizure process has been considered from the non-equilibrium thermodynamics and self-organization theory standpoints. It has been testified that, for the intensification of powder mix particles seizing with the substrate during spraying, it is required that relatively light components of the powder mix [...] Read more.
The seizure process has been considered from the non-equilibrium thermodynamics and self-organization theory standpoints. It has been testified that, for the intensification of powder mix particles seizing with the substrate during spraying, it is required that relatively light components of the powder mix should be preferably transferred into the friction zone. The theory inferences have been experimentally confirmed, as exemplified by the gas dynamic spray of copper-zinc powders mix. Full article
(This article belongs to the Special Issue Entropy Application in Tribology)
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Open AccessArticle
Control of Self-Organized Criticality through Adaptive Behavior of Nano-Structured Thin Film Coatings
Entropy 2016, 18(8), 290; https://doi.org/10.3390/e18080290 - 09 Aug 2016
Cited by 8
Abstract
In this paper, we will develop a strategy for controlling the self-organized critical process using the example of extreme tribological conditions caused by intensive build-up edge (BUE) formation that take place during machining of hard-to-cut austentic superduplex stainless steel SDSS UNS32750. From a [...] Read more.
In this paper, we will develop a strategy for controlling the self-organized critical process using the example of extreme tribological conditions caused by intensive build-up edge (BUE) formation that take place during machining of hard-to-cut austentic superduplex stainless steel SDSS UNS32750. From a tribological viewpoint, machining of this material involves intensive seizure and build-up edge formation at the tool/chip interface, which can result in catastrophic tool failure. Built-up edge is considered to be a very damaging process in the system. The periodical breakage of the build-ups may eventually result in tool tip breakage and, thereby, lead to a catastrophe (complete loss of workability) in the system. The dynamic process of build-up edge formation is similar to an avalanche. It is governed by stick-slip phenomenon during friction and associated with the self-organized critical process. Investigation of wear patterns on the frictional surfaces of cutting tools using Scanning Electron Microscope (SEM), combined with chip undersurface characterization and frictional (cutting) force analyses, confirms this hypothesis. The control of self-organized criticality is accomplished through application of a nano-multilayer TiAl60CrSiYN/TiAlCrN thin film Physical Vapor Deposition (PVD) coating containing elevated aluminum content on a cemented carbide tool. The suggested coating enhanced the formation of protective nano-scale tribo-films on the friction surface under operation. Moreover, machining process optimization contributed to further enhancement of this beneficial process, as evidenced by X-ray Photoelectron Spectroscopy (XPS) studies of tribo-films. This resulted in a reduction of the scale of the build ups leading to overall wear performance improvement. A new thermodynamic analysis is proposed concerning entropy production during friction in machining with buildup edge formation. This model is able to predict various phenomena and shows a good agreement with experimental results. In the presented research we demonstrated a novel experimental approach for controlling self-organized criticality using an example of the machining with buildup edge formation, which is similar to avalanches. This was done through enhanced adaptive performance of the surface engineered tribo-system, in the aim of reducing the scale and frequency of the avalanches. Full article
(This article belongs to the Special Issue Entropy Application in Tribology)
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Open AccessArticle
Thermal Characteristic Analysis and Experimental Study of a Spindle-Bearing System
Entropy 2016, 18(7), 271; https://doi.org/10.3390/e18070271 - 22 Jul 2016
Cited by 6
Abstract
In this paper, a thermo-mechanical coupling analysis model of the spindle-bearing system based on Hertz’s contact theory and a point contact non-Newtonian thermal elastohydrodynamic lubrication (EHL) theory are developed. In this model, the effect of preload, centrifugal force, the gyroscopic moment, and the [...] Read more.
In this paper, a thermo-mechanical coupling analysis model of the spindle-bearing system based on Hertz’s contact theory and a point contact non-Newtonian thermal elastohydrodynamic lubrication (EHL) theory are developed. In this model, the effect of preload, centrifugal force, the gyroscopic moment, and the lubrication state of the spindle-bearing system are considered. According to the heat transfer theory, the mathematical model for the temperature field of the spindle system is developed and the effect of the spindle cooling system on the spindle temperature distribution is analyzed. The theoretical simulations and the experimental results indicate that the bearing preload has great effect on the frictional heat generation; the cooling fluid has great effect on the heat balance of the spindle system. If a steady-state heat balance between the friction heat generation and the cooling system cannot be reached, thermally-induced preload will lead to a further increase of the frictional heat generation and then cause the thermal failure of the spindle. Full article
(This article belongs to the Special Issue Entropy Application in Tribology)
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Open AccessArticle
Anti-Icing Superhydrophobic Surfaces: Controlling Entropic Molecular Interactions to Design Novel Icephobic Concrete
Entropy 2016, 18(4), 132; https://doi.org/10.3390/e18040132 - 12 Apr 2016
Cited by 31
Abstract
Tribology involves the study of friction, wear, lubrication, and adhesion, including biomimetic superhydrophobic and icephobic surfaces. The three aspects of icephobicity are the low ice adhesion, repulsion of incoming water droplets prior to freezing, and delayed frost formation. Although superhydrophobic surfaces are not [...] Read more.
Tribology involves the study of friction, wear, lubrication, and adhesion, including biomimetic superhydrophobic and icephobic surfaces. The three aspects of icephobicity are the low ice adhesion, repulsion of incoming water droplets prior to freezing, and delayed frost formation. Although superhydrophobic surfaces are not always icephobic, the theoretical mechanisms behind icephobicity are similar to the entropically driven hydrophobic interactions. The growth of ice crystals in saturated vapor is partially governed by entropically driven diffusion of water molecules to definite locations similarly to hydrophobic interactions. The ice crystal formation can be compared to protein folding controlled by hydrophobic forces. Surface topography and surface energy can affect both the icephobicity and hydrophobicity. By controlling these properties, micro/nanostructured icephobic concrete was developed. The concrete showed ice adhesion strength one order of magnitude lower than regular concrete and could repel incoming water droplets at −5 °C. The icephobic performance of the concrete can be optimized by controlling the sand and polyvinyl alcohol fiber content. Full article
(This article belongs to the Special Issue Entropy Application in Tribology)
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Review

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Open AccessReview
Application of the Self-Organization Phenomenon in the Development of Wear Resistant Materials—A Review
Entropy 2016, 18(11), 385; https://doi.org/10.3390/e18110385 - 27 Oct 2016
Cited by 8
Abstract
Application of the phenomenon of self-organization for the development of wear resistant materials has been reviewed. For this purpose the term of self-organization and dissipative structures as applied to tribology have been discussed. The applications of this phenomenon have been shown in order [...] Read more.
Application of the phenomenon of self-organization for the development of wear resistant materials has been reviewed. For this purpose the term of self-organization and dissipative structures as applied to tribology have been discussed. The applications of this phenomenon have been shown in order to develop new wear resistant- and antifriction materials. Specific examples have been shown for the application of the self-organization phenomenon and the generation of dissipative structures for the formation of tribotechnical materials with enhanced wear resistance for current collecting materials and antifriction materials of bearings. Full article
(This article belongs to the Special Issue Entropy Application in Tribology)
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