Results 111 to 120 of about 173 (149)
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Modification of polypropylene surfaces with micropits and hierarchical micropits/nanodepressions
Surface Science, 2010Abstract Micropit surfaces and hierarchically structured micropit/nanodepression surfaces were fabricated in polypropylene by injection moulding. The first step in the process was the microstructuring of aluminium foils with a micro-working robot to obtain a pattern of micropits.
Tiina Rasilainen +4 more
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Micropitting in Hertzian Contacts
Journal of Lubrication Technology, 1980This paper shows that both micropits and spalls occur near pure rolling conditions. The first are initiated at the surface and are related to asperity interaction. The second are well described in the literature and will not be discussed here. A model capable of predicting the mechanical conditions under which micropits are generated is presented.
D. Berthe +3 more
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Effect of lubricant on micropitting and wear
Tribology International, 2009Micropitting was studied using a three-contact disc machine having a central roller in contact with three harder, annular counter-discs (“rings”) of precisely controlled roughness. Roughness, running conditions, base stock and additive concentration were varied.
E. Lainé, A.V. Olver, T.A. Beveridge
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Simplified modellization of gear micropitting
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2002This document gives a simplified method of calculating gear micropitting. The method has been developed by EUROCOPTER. The objective was to provide a model that took into consideration the maximum number of parameters in order to model the different physical phenomena, particularly: an oil-film thickness calculation taking the ...
F Antoine, J-M Besson
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The influence of surface roughness and viscosity on micropitting damage
Industrial Lubrication and Tribology, 2021Purpose This study aims to investigate the influence of surface roughness and viscosity on micropitting and their influence sequence. Design/methodology/approach Specimens were made of carburized and quenched 18CrNiMo7-6, and different
Wei Li, Liantao Lu
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A micropit for biological cell positioning
2009 IEEE International Conference on Control and Automation, 2009Dielectrophoresis (DEP) may be used to trap or to move biological cells. Automated position control of cells has been proposed to eliminate operator dependent experimental parameter variations and increase throughput of labour intensive laboratory procedures such as couplet fusion for mammalian cloning or plant hybridisation, and cell sorting. However,
Andrew L. Clow +2 more
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Martensite decay in micropitted gears
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2005Metallographic examination performed on a number of micropitted gears has revealed microstructural features similar to those reported in the literature in fatigued bearings, namely, dark etching regions and white etching bands. In addition, a new type of fatigue-induced microstructural constituent was observed close to the surface below asperities ...
Oila A, Shaw BA, Aylott CJ, Bull SJ
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Micropitting of Bearings and Gears in Aviation
2022<div class="section abstract"> <div class="htmlview paragraph">The intent of this SAE Aerospace Information Report (AIR) is to summarize and review the E34 committee’s efforts to educate the aerospace propulsion lubrication community on the science of micropitting, its consequences, and the various tribology evaluation methods that can be
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Direct observations of a micropit in an elastohydrodynamic contact
Wear, 2004Abstract A hard steel roller from a disc tester which had an isolated micropit and associated cracks on its surface was pressed against a glass plate and subjected to a range of lubricated, rolling–sliding conditions, with the objective of observing the effect on the distribution of film thickness in an EHL contact.
A.V. Olver +3 more
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2023
<div class="section abstract"> <div class="htmlview paragraph">This method is designed to evaluate the micropitting performance of currently available and future aviation turbine oil formulations. Drawing on previously performed tests documented in AIR6989, the method comprises of three rings rotating against a rotating central roller ...
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<div class="section abstract"> <div class="htmlview paragraph">This method is designed to evaluate the micropitting performance of currently available and future aviation turbine oil formulations. Drawing on previously performed tests documented in AIR6989, the method comprises of three rings rotating against a rotating central roller ...
openaire +1 more source