Recent Advances in Lubricating Greases

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

Deadline for manuscript submissions: closed (31 August 2020) | Viewed by 7021

Special Issue Editor


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TREC, Institute of Engineering Design and Product Development, Hamburg University of Applied Sciences, Berliner Tor 21, 20099 Hamburg, Germany
Interests: tribology; lubricating grease; energetic approach
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Special Issue Information

Dear Colleagues,

Lubricating greases are markedly visco-elastical lubricants with a special tribological behavior, but with a wide range of application. Our research work has, more or less, two main directions: understanding the behavior of greases during tribology stress, and furthering knowledge of the behavior of greases in concrete machine element applications. In the course of this work, opportunities were also created to develop new lubricants such as biodegradable and completely biogenic lubricating greases.

In recent years, work on the structural degradation of lubricating greases has increasingly been carried out. This has led to a new research focus on lubricating grease tribology. Energetical investigations seem to be an appropriate tool with which to obtain new information.

The success of the Special Issue of Lubricating Greases in 2017 (https://www.mdpi.com/journal/lubricants/special_issues/greases2017) encouraged us to continue this interesting topic.

We hope researchers will accept our invitation and present their research work.

Prof. Dr. Erik Kuhn
Guest Editor

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Published Papers (2 papers)

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Research

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9 pages, 1477 KiB  
Article
Aspects of Self-Organization of Tribological Stressed Lubricating Greases
by Erik Kuhn
Lubricants 2020, 8(3), 28; https://doi.org/10.3390/lubricants8030028 - 4 Mar 2020
Cited by 1 | Viewed by 2336
Abstract
Lubricating greases are markedly visco-elastic materials. Stressed by a friction process, this special material shows a drop of a measured shear stress or viscosity. This typical behaviour is observed in a number of papers and, therefore, is well known. Some different explanations can [...] Read more.
Lubricating greases are markedly visco-elastic materials. Stressed by a friction process, this special material shows a drop of a measured shear stress or viscosity. This typical behaviour is observed in a number of papers and, therefore, is well known. Some different explanations can be found but most of them describe a structural degradation caused by the friction process. This paper attempts to elucidate the conditions that promote that structural change and understand this behaviour as an intrinsic response of the system. Full article
(This article belongs to the Special Issue Recent Advances in Lubricating Greases )
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Review

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17 pages, 3618 KiB  
Review
The Use of Entropy in Modeling the Mechanical Degradation of Grease
by Alan Gurt and Michael Khonsari
Lubricants 2019, 7(10), 82; https://doi.org/10.3390/lubricants7100082 - 20 Sep 2019
Cited by 20 | Viewed by 4022
Abstract
Recent theoretical developments linking degradation to the thermodynamic concept of entropy have allowed a new approach to modeling all types of degradation. The theory has been successfully applied to wear, fatigue, and numerous other forms of degradation and experimentation has confirmed its applicability [...] Read more.
Recent theoretical developments linking degradation to the thermodynamic concept of entropy have allowed a new approach to modeling all types of degradation. The theory has been successfully applied to wear, fatigue, and numerous other forms of degradation and experimentation has confirmed its applicability to modeling the mechanical degradation of lubricating grease. This paper overviews the mechanical degradation of grease, discusses past and present modeling techniques, shows how new techniques can be used to predict grease life, and provides suggestions for future research. Full article
(This article belongs to the Special Issue Recent Advances in Lubricating Greases )
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