Article
Engineering, Mechanical
B. Wainwright, H. Takeuchi, T. Makino, A. Kadiric
Summary: Micropitting is a major failure mode in gears and rolling bearings. In this study, the individual effects of surface roughness amplitude and A-ratio on micropitting are investigated. It is found that surface roughness has a greater influence on micropitting than A-ratio, and the A-ratio alone is unable to accurately assess the risk of micropitting. Furthermore, there exists a sufficiently low surface roughness below which micropitting is unlikely to occur even at extremely low A-ratios.
Article
Engineering, Mechanical
Michele Santeramo, Carmine Putignano, Georg Vorlaufer, Stefan Krenn, Giuseppe Carbone
Summary: In this paper, a Boundary Element methodology is presented to study the operation of a viscoelastic rolling element bearing in steady-state conditions. The methodology is able to deal with any real linear viscoelastic material and incorporates the circular geometry of the domain. The assessment of this contact problem is crucial as it affects the load distribution among the rollers and the durability of the bearing.
MECHANISM AND MACHINE THEORY
(2023)
Article
Materials Science, Multidisciplinary
Dennis Konopka, Florian Pape, Norman Heimes, Bernd-Arno Behrens, Kai Moehwald, Gerhard Poll
Summary: In addition to conventional lubricants, rolling bearings can also be used with dry lubricants. This study applied a molybdenum-based coating system using physical vapor deposition. The coating system effectively improved friction behavior and extended operating times. Material analyses demonstrated successful transfer of the coating to uncoated components, reducing abrasive and adhesive wear.
Article
Chemistry, Physical
M. Bartolome, D. Goncalves, A. Garcia Tuero, R. Gonzalez, A. Hernandez Battez, J. H. O. Seabra
Summary: Two phosphonium-derived ionic liquids (IL1 and IL2) were added to lithium complex (G1) and anhydrous calcium-based (G2) greases at a concentration of 5 wt%. Friction torque and wear tests were performed to evaluate the effects of the ILs on the friction and wear properties of the greases. IL2 showed improved friction reduction performance for both greases, especially G1. Both ILs improved the antiwear behavior of G2 and IL2 also helped alleviate the oxidation and thermal aging issues in G2.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Mechanical
Mao Ueda, Benjamin Wainwright, Hugh Spikes, Amir Kadiric
Summary: Micropitting is a surface fatigue damage that occurs in rolling-sliding contacts under thin oil film conditions and is poorly understood, Friction has a very significant impact on micropitting, reducing friction can mitigate crack initiation and propagation.
Article
Thermodynamics
Risheng Long, Zhen Pan, Zhihao Jin, Yimin Zhang, Shaoni Sun, Yueyong Wang, Yibing Wang, Manhong Li
Summary: The study investigates the tribological behavior of grooves textured thrust cylindrical roller bearings under dry wear, showing that the textured bearings can reduce the coefficient of friction and mass loss in certain parameters. The influence of pattern parameters on surface stresses of the bearings is minimal, indicating excellent tribological performance.
ADVANCES IN MECHANICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Xiaojie Tang, Junning Li
Summary: This manuscript investigates the friction and wear mechanism of nano-lubricated high-speed rolling bearings under various nanoparticle embedded states. It reveals the friction and wear properties of bearings under different embedding conditions and obtains the anti-wear mechanism of nano-lubricated high-speed rolling bearings. The results show that complete embedding of different nanoparticles effectively improves the anti-wear effect of the bearings, and the use of nanoparticle mixed oil enhances the anti-wear performance under high speed and oil-lacking conditions.
Article
Engineering, Mechanical
Wyatt Peterson, Thomas Russell, Farshid Sadeghi, Michael Tekletsion Berhan
Summary: Experimental and simulation studies have shown that lubrication conditions and bearing types have a significant impact on fluid drag losses, while bearing cage design has a minimal impact on this aspect.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Julian Somberg, Prabakaran Saravanan, Hari Shankar Vadivel, Kim Berglund, Yijun Shi, Jan Ukonsaari, Nazanin Emami
Summary: The study found that using environmentally friendly lubricants can significantly reduce friction, while using water can increase wear for most materials. Under different lubricating conditions, the PPS composite material demonstrated superior tribological properties.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Risheng Long, Qingyu Shang, Zhihao Jin, Yimin Zhang, Zichen Ju, Manhong Li
Summary: This paper investigates the influence of dimples on the tribological properties of rolling element bearings under starved lubrication. The results show that, within a certain range, the textured bearings with appropriate diameter and depth of dimples can significantly improve the friction and wear properties of the bearings. Specifically, the textured bearings with a diameter of 250 μm and a depth of 8 μm exhibit excellent friction reduction ability and wear resistance.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Jake Airey, James Simpson, Matthew Spencer, Richard W. Greenwood, Mark J. H. Simmons
Summary: This article explores the impact of anti-wear additives on micropitting and tribofilm formation. The study finds that aviation anti-wear additives promote micropitting less than zinc dialkyldithiophosphate (ZDDP) but more than base oil alone. The slower formation of tribofilms allows for initial running-in of surfaces, effectively delaying the initiation of micropitting.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Marine
Fengming Du, Dawei Li, Mingxing Hao, Yang Yu, Weiwei Wang
Summary: In this study, a sliding bearing friction calculation program is developed using the Fortran language, and a component-level sliding bearing tribology testing machine is designed. The program calculates the friction force of the bearing under different working conditions, while the testing machine predicts wear failure and explores the wear mechanism for different types of sliding bearings. The model calculation results are in good agreement with the experimental data, verifying the model's correctness. Through the wear test, it is found that the wear mechanism of the sliding bearing is mainly scratches and the electroplating layer reduces friction by being squeezed out and attached to the surface of the aluminum alloy. The model and testing machine provide theoretical guidance for the friction durability of sliding bearings used in marine engineering and ensure the reliability of marine engineering.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Chih-Ling Lin, Paul A. Meehan
Summary: This study characterises wear debris in grease-lubricated spherical roller bearings used in urban rolling stock, revealing that wear is mainly associated with rolling/sliding contact and adhesive mechanisms. Morphological changes in spherical and chunky wear debris associated with bearings' service life were observed, with chunky wear debris formation not necessarily governed by rolling contact fatigue but rather the collapse of larger spherical wear debris.
Article
Materials Science, Ceramics
Lupeng Wu, Le Gu, Ranran Jian
Summary: The study showed that adding graphene during lubrication of Si3N4 ceramic/GCr15 steel components can reduce friction and improve wear resistance. Graphene can act as a protective agent through lubrication mechanism, reducing wear on the rubbing surfaces.
CERAMICS INTERNATIONAL
(2021)
Review
Materials Science, Multidisciplinary
Fengming Du, Dawei Li, Xiaoxia Sa, Cong Li, Yang Yu, Chengdi Li, Jingsi Wang, Weiwei Wang
Summary: Sliding bearings are critical components of internal combustion engines, with wear issues being crucial to machinery reliability. Research on wear mechanisms, lifespan prediction, material selection, and surface treatments are essential.