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Digital and Computational Tribology
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Digital and Computational Tribology

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Surface Sciences and Technology".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 5139

Special Issue Editors

Dr. Silvia Logozzo

E-Mail Website
Guest Editor
Department of Engineering, University of Perugia, 1, 06123 Perugia, Italy
Interests: tribology; robotics; mechanics of machines; system dynamics; 3D scanning
Special Issues, Collections and Topics in MDPI journals
Dr. Maria Cristina Valigi

E-Mail Website
Guest Editor
Department of Engineering, University of Perugia, 06125 Perugia, Italy
Interests: tribology; robotics; mechanism theory; multibody dynamics; grasping and manipulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Tribology is a key discipline in many applied sciences such as mechanical engineering, chemistry, physics, material science, and medicine as well as in ecology and energy management.

In the study of tribological matters, use of a pure theoretical approach is often inadequate for fully describing phenomena such friction, wear, and lubrication, and the combination of computational and digital methods is becoming increasingly crucial for detecting and predicting faults in mechanical and biomedical components.

This Special Issue is focused on the application of digital and computational methods in the field of tribology. Both experimental and modeling applications fall into the topics of this Special Issue.

Particularly welcome are works that validate preliminary numerical simulations with experimental digital methods, although also papers focused on pure computational or pure digital experimental works are also welcome.

Papers focused on the application of innovative digital methods in tribology are also encouraged, which may serve as starting points for new clever and effective techniques.

Dr. Silvia Logozzo
Prof. Dr. Maria Cristina Valigi
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • digital tribology
  • computational tribology
  • friction measurements
  • optical diagnostics
  • wear maps
  • wear models
  • lubrication models
  • contact models
  • contact mechanics measurements
  • film thickness measurements

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Published Papers (3 papers)

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Research

17 pages, 7717 KiB  
Article
A Quantitative and Qualitative Analysis of the Lubricity of Used Lubricating Oil Diluted with Diesel Oil
by Leszek Chybowski, Marcin Szczepanek, Robert Sztangierski and Piotr Brożek
Appl. Sci. 2024, 14(11), 4567; https://doi.org/10.3390/app14114567 - 26 May 2024
Cited by 1 | Viewed by 1062
Abstract
Experience shows that dilution of lubricating oil with diesel oil is unfavorable to the engine, causing issues including deterioration of engine performance, shortening of oil life, and reduction in engine reliability and safety. This paper presents the verification of the hypothesis that the [...] Read more.
Experience shows that dilution of lubricating oil with diesel oil is unfavorable to the engine, causing issues including deterioration of engine performance, shortening of oil life, and reduction in engine reliability and safety. This paper presents the verification of the hypothesis that the changes in lubricity, friction coefficient, and decreasing oil film thickness (using a relative approach, given as a percentage) are similar for lubricating oil and diesel mixtures prepared from fresh lubricating oil and used lubricating oil. To validate this hypothesis, an experiment is conducted using a high-frequency reciprocating rig (HFFR), in which the lubricity is determined by the corrected average wear scar WS1.4, the coefficient of friction μ, and the percentage relative decrease in oil film thickness r. A qualitative visual assessment of the wear scars on the test specimens is also performed after the HFFR tests. The testing covers mixtures of SAE 30 grade Marinol CB-30 RG1230 lubricating oil with Orlen Efecta Diesel Biodiesel. The used lubricating oil is extracted from the circulating lubrication system of a supercharged, trunk-piston, four-stroke ZUT Zgoda Sulzer 5 BAH 22 engine installed in the laboratory of ship power plants of the Maritime University of Szczecin. Mixtures for the experiment are prepared for fresh lubricating oil with diesel oil and used lubricating oil with diesel oil. Mixtures of these lubricating oils with diesel oil are examined for diesel oil concentrations in the mixture equal to 1, 2, 5, 10, 15, and 20% m/m. The results of the experiment confirm the hypothesis, proving that, for up to 20% m/m diesel oil concentration in lubricating oil, the changes in the lubricity of used lubricating oil diluted with diesel oil can be evaluated based on reference data prepared for mixtures of diesel oil with fresh lubricating oil. The linear approximation of μ and r trends is made with a certain margin of error we estimated. The experiment also confirms the results of previous studies which state that oil aging products in small quantities contribute to improved lubricity. Full article
(This article belongs to the Special Issue Digital and Computational Tribology)
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16 pages, 12736 KiB  
Article
Experimental Wear Characterization and Durability Enhancement of an Aeronautic Braking System
by Silvia Logozzo and Maria Cristina Valigi
Appl. Sci. 2023, 13(13), 7646; https://doi.org/10.3390/app13137646 - 28 Jun 2023
Viewed by 872
Abstract
This paper is focused on the experimental wear characterization of an electromagnetic braking system used for helicopters. The characterization was performed through the evaluation of some monitoring parameters during endurance tests on a test bench and through the visual analysis of the worn [...] Read more.
This paper is focused on the experimental wear characterization of an electromagnetic braking system used for helicopters. The characterization was performed through the evaluation of some monitoring parameters during endurance tests on a test bench and through the visual analysis of the worn surfaces after the tests. The monitoring parameters were the engagement threshold voltage, the release threshold voltage, the inductance, and the braking torque, which are directly correlated with the wear progress. The visual analysis allowed the assessment of the wear extent and the distribution of wear particles at the interfaces. The test performed on the initial base configuration, having ten springs and carbon fibers as friction materials, demonstrated that the braking system had insufficient durability in terms of actuation cycles. The results allowed the design of two new configurations based on different brake architectures and on different friction pairs. One of the new configurations was based on a reduction in the number of springs (eight-spring configuration), and the second one was based on the employment of a different friction material (NAO configuration). Both of these optimized configurations showed enhanced durability and wear resistance, but only the second one showed sufficient durability with respect to the requirements and was defined as acceptable. The final results showed a durability of 3000 actuation cycles for the base configuration, 4385 for the eight-spring configuration, and 35,223 for the NAO configuration. Nevertheless, the analysis of results allowed the cause of the wear phenomena to be studied and eventual further improvements in the system to be suggested. Full article
(This article belongs to the Special Issue Digital and Computational Tribology)
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13 pages, 49708 KiB  
Article
Wear Effect on the Contact between a Metallic Pin and a Rotating Polymeric Specimen
by Annamaria Visco, Gabriella Epasto, Fabio Giudice, Cristina Scolaro and Andrea Sili
Appl. Sci. 2023, 13(7), 4463; https://doi.org/10.3390/app13074463 - 31 Mar 2023
Viewed by 1714
Abstract
Debris formation is a crucial aspect that determines the lifespan of prosthetic joints. The wearing contact between ultra-high molecular weight polyethylene (UHMWPE) and a Ti alloy surface has been studied in the literature. However, when measuring mass loss, potential errors can arise due [...] Read more.
Debris formation is a crucial aspect that determines the lifespan of prosthetic joints. The wearing contact between ultra-high molecular weight polyethylene (UHMWPE) and a Ti alloy surface has been studied in the literature. However, when measuring mass loss, potential errors can arise due to the very small values involved (on the order of some units of 0.1 mg in experiments lasting several hours) and be caused by the absorption of humidity in the specimen, in addition to the lack of accuracy typical of weight scales. These errors can hardly be avoided, but accurate cleaning and drying processes can minimize them. With these premises, the present work aims to determine, by pin-on-disc test, the wear effect in the UHMWPE rotating sheet and Ti6Al4V pin produced by Electron Beam Melting (EBM) under dry and lubricated conditions. The morphology of the worn surface was documented by optical microscopy, and the volume loss of both the rotating specimens and the pin was accurately calculated through the detection of the wear track observed by optical microscopy. In particular, the present work proposes a method for directly determining the volume loss of the polymer to compare it with that obtained with the weight measurement. For both procedures, the uncertainty in evaluating the specific wear rate was analyzed, demonstrating that volume measurement allows for avoiding any possible error associated with weighing the polymeric specimens. Full article
(This article belongs to the Special Issue Digital and Computational Tribology)
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