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Lubricants
Volume 8
Issue 10
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Lubricants, Volume 8, Issue 10 (October 2020) – 3 articles

Cover Story (view full-size image): Apart from complex numerical models to predict the tribological behavior of elastohydrodynamically lubricated contacts, non-dimensional similarity groups, and analytically solvable proximity equations can be used to estimate integral fluid film parameters. Based on the pioneering work of Dowson and Higginson as well as Blok and Moes, these approaches have been improved by modifications or correction factors to capture different contact geometries (line-, point-, or elliptical contacts) and to include fluid compression, thermal, non-Newtonian, starvation, or roughness effects. This review article systematically reviews these modifications/corrections and discusses their applicability as well as limitations before presenting some future research directions. View this paper.
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20 pages, 3116 KiB  
Review
Non-Dimensional Groups, Film Thickness Equations and Correction Factors for Elastohydrodynamic Lubrication: A Review
by Max Marian, Marcel Bartz, Sandro Wartzack and Andreas Rosenkranz
Lubricants 2020, 8(10), 95; https://doi.org/10.3390/lubricants8100095 - 20 Oct 2020
Cited by 36 | Viewed by 6647
Abstract
Apart from complex numerical models to predict the tribological behavior of elastohydrodynamically lubricated contacts, non-dimensional similarity groups and analytically solvable proximity equations can be used to estimate integral fluid film parameters. Based upon the pioneering work presented by Dowson and Higginson as well [...] Read more.
Apart from complex numerical models to predict the tribological behavior of elastohydrodynamically lubricated contacts, non-dimensional similarity groups and analytically solvable proximity equations can be used to estimate integral fluid film parameters. Based upon the pioneering work presented by Dowson and Higginson as well as Blok and Moes, these approaches have been continuously improved over the years by modifications or correction factors to capture different contact geometries (line-, point- or elliptical contacts) as well as to include fluid compression, thermal, non-Newtonian, starvation or roughness effects. Consequently, this review article aims at systematically reviewing these modifications/corrections and discussing their applicability as well as limitations before presenting some recommendations for future research activities. Full article
(This article belongs to the Special Issue In Commemoration of Professor Duncan Dowson: Tribology: Hydrodynamics, Elastohydrodynamics and Biotribology)
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11 pages, 8368 KiB  
Article
Simulation of Adhesive Contact of Soft Microfibrils
by Xin He, Qiang Li and Valentin L. Popov
Lubricants 2020, 8(10), 94; https://doi.org/10.3390/lubricants8100094 - 16 Oct 2020
Cited by 2 | Viewed by 2452
Abstract
Adhesive contact between a flat brush structure with deformable microfibrils and an elastic half space is numerically simulated. The stiffness of pillars is modeled by linear springs. The fast Fourier transform-assisted boundary element method for the contact of rigid indenters is modified to [...] Read more.
Adhesive contact between a flat brush structure with deformable microfibrils and an elastic half space is numerically simulated. The stiffness of pillars is modeled by linear springs. The fast Fourier transform-assisted boundary element method for the contact of rigid indenters is modified to include the microfibril stiffness so that the deflection of pillars and elastic interaction to elastic foundation are coupled. In the limiting case of rigid pillars (pillar stiffness is much larger than the contact stiffness), the adhesive force is determined by the filling factor of brush, as described earlier. In the case of very soft pillars, the adhesive force is proportional to N1/4, where N is the number of pillars. The influence of relative stiffness, number and distribution of pillars on adhesive force is studied numerically. The results from both regularly and randomly distributed pillars show that the adhesive force is enhanced by splitting a compact punch into microfibrils and this effect becomes larger when the fibrils are softer. Full article
(This article belongs to the Special Issue Computer Simulation in Tribology and Friction II)
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23 pages, 11983 KiB  
Review
Tribological Performance and Application of Antigorite as Lubrication Materials
by Zhimin Bai, Guijin Li, Fuyan Zhao and Helong Yu
Lubricants 2020, 8(10), 93; https://doi.org/10.3390/lubricants8100093 - 11 Oct 2020
Cited by 9 | Viewed by 2858
Abstract
Antigorite is a Mg-rich 1:1 trioctahedral-structured layered silicate mineral. In recent decades, many studies have been devoted to investigating the tribological performance and application of antigorite as lubrication materials. This article provides an overview of the mineralogy, thermal decomposition and surface modifications of [...] Read more.
Antigorite is a Mg-rich 1:1 trioctahedral-structured layered silicate mineral. In recent decades, many studies have been devoted to investigating the tribological performance and application of antigorite as lubrication materials. This article provides an overview of the mineralogy, thermal decomposition and surface modifications of antigorite powders, as well as the recent advancement that has been achieved in using antigorite to reduce friction and wear of friction pairs. The tribological performance of antigorite powders and its calcined product in different lubricating media, such as oil, grease and solid composites have been comprehensively reviewed. The physico-chemical characteristics of surface layers of the friction pairs are discussed. Applications and mechanisms of lubricity and anti-wear of antigorite are highlighted. Full article
(This article belongs to the Special Issue Applied Tribology in Mechanical Engineering)
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