Tribology in Germany: Latest Research and Development

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

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 4125

Special Issue Editor


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Guest Editor
Faculty of Mechanical Engineering, Chair of Machine Elements and Tribology, Otto von Guericke University Magdeburg, Universitaetsplatz 2, 39106 Magdeburg, Germany
Interests: thermal-elastohydrodynamic lubrication; mixed and boundary lubrication; machine elements; drive technology; method development for simulation and test; wear

Special Issue Information

Dear Colleagues,

The beginnings of systematic tribology research in Germany started more than 130 years ago. In 1902 Stribeck's hydrodynamic studies were published, which resulted in the well-known Stribeck curve. In order to achieve better cooperation between different specialist disciplines, various specialist groups were founded in Germany from 1949 onwards, and their work was brought together in 1959 by the founding of the Society for Tribology (GfT). The visibility of German tribology is internationally characterized by the automotive industry and mechanical engineering. Despite its basic orientation, tribological research is always focused on the product. Currently, tribological work is concentrating on topics such as sustainability—raw material availability, reduction of emissions in the use phase, recyclability, defossilization/decarbonization in mobility and industry, as well as on digitalization. This Special Issue intends to show the latest tribological results in research and development in Germany on the occasion of the 65th anniversary of the German Society for Tribology (GfT).

Prof. Dr. Dirk Bartel
Guest Editor

Manuscript Submission Information

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Keywords

  • artificial intelligence
  • alternative fuels
  • biotribology
  • coatings
  • hydrogen
  • ice tribology
  • lubricants
  • nanotribology
  • simulation
  • superlubricity
  • water-containing fluids

Published Papers (2 papers)

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Research

17 pages, 3126 KiB  
Article
Transition between Friction Modes in Adhesive Contacts of a Hard Indenter and a Soft Elastomer: An Experiment
by Iakov A. Lyashenko, Thao H. Pham and Valentin L. Popov
Lubricants 2024, 12(4), 110; https://doi.org/10.3390/lubricants12040110 - 28 Mar 2024
Viewed by 2474
Abstract
The tangential adhesive contact (friction) between a rigid steel indenter and a soft elastomer at shallow indentation depths, where the contact exists mainly due to adhesion, is investigated experimentally. The dependencies of friction force, contact area, average tangential stresses, and the coordinates of [...] Read more.
The tangential adhesive contact (friction) between a rigid steel indenter and a soft elastomer at shallow indentation depths, where the contact exists mainly due to adhesion, is investigated experimentally. The dependencies of friction force, contact area, average tangential stresses, and the coordinates of the front and back edges of the contact boundary on the indenter displacement are studied. It is found that first a stick–slip mode of friction is established, which is then replaced by another, more complex mode where the phase of a global slip of the elastomer on the indenter surface is absent. In both regimes, the evolutions of friction force and contact area are analyzed in detail. Full article
(This article belongs to the Special Issue Tribology in Germany: Latest Research and Development)
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15 pages, 13289 KiB  
Article
Calculation and Validation of Planet Gear Sliding Bearings for a Three-Stage Wind Turbine Gearbox
by Huanhuan Ding, Ümit Mermertas, Thomas Hagemann and Hubert Schwarze
Lubricants 2024, 12(3), 95; https://doi.org/10.3390/lubricants12030095 - 15 Mar 2024
Viewed by 1123
Abstract
In recent years, the trend towards larger wind turbines and higher power densities has led to increasing demands on planet gear bearings. The use of sliding bearings instead of rolling bearings in planetary bearings makes it possible to increase the power density with [...] Read more.
In recent years, the trend towards larger wind turbines and higher power densities has led to increasing demands on planet gear bearings. The use of sliding bearings instead of rolling bearings in planetary bearings makes it possible to increase the power density with lower component costs and higher reliability. Therefore, the use of planet gear sliding bearings in wind turbine gearboxes has become more common. However, the flexible structure and complex load conditions from the helical tooth meshes lead to highly complex elastic structure deformation that modifies the lubricant film thickness and pressure distribution and, thus, has to be considered in the calculation of the bearing’s load-carrying capacity. This paper introduces a highly time-efficient calculation procedure that is validated with pressure measurement data from a three-stage planetary gearbox for a multi-megawatt wind energy plant. The investigations focus on three main objectives: (i) analyses of experimental and predicted results for different load cases, (ii) validation of the results of planet gear sliding bearing code, and (iii) discussion on mandatory modeling depths for the different planet stages. Results indicate the necessity of further research in this field of applications, particularly for the third-stage bearings. Full article
(This article belongs to the Special Issue Tribology in Germany: Latest Research and Development)
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