Symmetry and Asymmetry in Materials and Mechanical Engineering: Properties and Applications

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 1025

Special Issue Editors


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Guest Editor
Associate Professor, School of Mechanical Engineering, Shandong University of Technology, Zibo, China
Interests: tribological and lubrication theory and experiment; analysis and design of rotating machinery; surface coating; laser surface treatment

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Guest Editor
Associate Research Fellow, School of Design, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: dynamic equipment with low friction, long lifespan, and multidisciplinary cross-cutting technology; fluid-solid-thermal coupled dynamics and control technology; advanced structural and composite material design technology
School of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou 325035, China
Interests: bearing; coating; friction; lubrication; wear-resistant

Special Issue Information

Dear Colleagues,

The symmetric and asymmetric characteristics of materials or mechanical design affect the operational performance of mechanical systems. The symmetric and asymmetric properties of materials include symmetry/asymmetry at the atomic, nano-, and micrometer scales, as well as isotropic/anisotropic macroscopic properties. The symmetric and asymmetric characteristics of mechanical structure design include the symmetry and asymmetry of structure and load. Symmetrical material or structural design typically provides better stability and has a wide range of applications. In structural engineering, symmetrical shapes and arrangements are easier to design and manufacture, reducing costs. The performance of mechanical systems is easier to calculate and predict by using symmetrical materials. On the other hand, asymmetry exists extensively in materials and mechanical engineering. For example, the asymmetry of forces can cause stress concentration, posing higher requirements for mechanical design. However, the directed transport of microfluids and heat can be achieved by introducing asymmetry through changing material properties or geometric structures. This Special Issue studies the symmetry and asymmetry characteristics of material and mechanical structure design, as well as related applications. The research method can involve modeling, simulation, machine learning, or experiments.

Dr. Xiuli Zhang
Dr. Gengyuan Gao
Dr. Jun Cao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Symmetry is an international peer-reviewed open access monthly 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

  • symmetry
  • asymmetry
  • mechanical design
  • heterogeneous structure
  • micro-nano functional structure
  • surface technology
  • heat transfer
  • directed transport
  • fluid flow

Published Papers (1 paper)

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Research

21 pages, 10444 KiB  
Article
Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel
by Sergii Panchenko, Juraj Gerlici, Alyona Lovska, Vasyl Ravlyuk, Ján Dižo and Miroslav Blatnický
Symmetry 2024, 16(3), 346; https://doi.org/10.3390/sym16030346 - 13 Mar 2024
Viewed by 716
Abstract
This article presents the results of a study focused on identifying the main causes of the asymmetric (clinodual) wear of composite brake pads on freight wagons. A new scientific approach to determining the clinodual wear of composite brake pads on freight wagons is [...] Read more.
This article presents the results of a study focused on identifying the main causes of the asymmetric (clinodual) wear of composite brake pads on freight wagons. A new scientific approach to determining the clinodual wear of composite brake pads on freight wagons is proposed. It is established that the harmful abrasion of the pad occurs during the movement of the freight train due to an imperfection in the bogie-brake lever transmission. The causes of the non-normative frictional wear of composite brake pads were investigated. This kind of wear leads to the tilting and abutting of the upper end of the brake pads against the rotating wheel during train running. The results of geometric and kinetostatic studies of the “pad–wheel” tribotechnical pair are provided to establish the causes and consequences of the accelerated clinodual frictional wear of composite brake pads on pendulum suspension in the bogies of freight wagons. The conditions of rotation of the wheels during braking “for” and “against” the clockwise direction depending on the direction of the train are considered. A new approach to brake-pad-wear prediction depending on the mileage of wagons under operational conditions is proposed. The research conducted in this study contributes to the development of the mechanical parts of freight-wagon brakes, increasing the efficiency of brake operation and improving the safety of train traffic. Full article
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