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Symmetry
Special Issues
Mechanical Properties of Materials and Symmetry/Asymmetry
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Mechanical Properties of Materials and Symmetry/Asymmetry

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

Deadline for manuscript submissions: closed (15 February 2024) | Viewed by 4170

Special Issue Editors

Prof. Dr. Jia Li

E-Mail Website
Guest Editor
College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
Interests: multi-principal element alloy; molecular dynamics simulation; DFT calculations; machine learning; high throughput experiment and simulation
Prof. Dr. Zhifeng Lei

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Hunan University, Changsha 410082, China
Interests: high-entropy alloys; laves phases; laser cladding; anodizing; amorphous alloys

Special Issue Information

Dear Colleagues,

Symmetric/asymmetric structures can be naturally produced and artificially manufactured. Their unique geometric structures have attracted wide attention. At the same time, the unique geometric structure has excellent mechanical, physical and chemical properties. It has become a research hotspot of functional structural materials to produce more excellent mechanical properties by controlling symmetrical microstructures. Among them, multi principal component alloys not only have unique symmetry at the atomic scale, lattice symmetry at the nano scale, precipitate/grain symmetry at the micron scale, but also have isotropic/anisotropic macroscopic properties. How to understand this unique "structure performance" quantitative correlation from a cross-scale perspective and regulate/improve performance has become a challenging scientific problem. This Special Issue would use modeling, simulation, machine learning and experimental means to study the influence mechanism of symmetry/antisymmetry on performance from the aspects of material design and performance. More importantly, it would promote the development of integrated design toward the specific customization functionality for alloy materials.

This Special Issue is open to original research articles, as well as review articles, which are related to the development, performance and characterization of multi principal component alloys. Any applications and/or theoretical works are welcome.

Prof. Dr. Jia Li
Prof. Dr. Zhifeng Lei
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.

Published Papers (3 papers)

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Research

13 pages, 4030 KiB  
Article
Temperature Effects on Critical Energy Release Rate for Aluminum and Titanium Alloys
by Teng Long, Leyu Wang, James D. Lee and Cing-Dao Kan
Symmetry 2024, 16(2), 142; https://doi.org/10.3390/sym16020142 - 25 Jan 2024
Cited by 1 | Viewed by 935
Abstract
This work investigates temperature’s effect on the critical energy release rate using damage mechanics material models and the element deletion method. The energy release rate describes the decrease in total potential energy per increase in crack surface area. The critical energy release rate [...] Read more.
This work investigates temperature’s effect on the critical energy release rate using damage mechanics material models and the element deletion method. The energy release rate describes the decrease in total potential energy per increase in crack surface area. The critical energy release rate is widely used as the failure criterion for various elastic and plastic materials. In real-life scenarios, fractures may occur at different temperatures. The temperature dependency of the critical energy release rate for aluminum 2024-T351 and titanium Ti-6Al-4V is studied in this work. We utilized test-data-based advanced material models of these two alloys, considering the strain rate, temperature, and state of stress for plasticity and failure. These material models are used to simulate a three-dimensional fracture specimen to find the critical energy release rate at different temperatures. A new method to calculate the critical energy release rate with the element deletion method is introduced and verified with the virtual crack opening method. This method enables the calculation of the energy release rate in a classical damage mechanics simulation for dynamic cack propagation. The simulation result indicates that the critical energy release rate increases with rising temperatures for these alloys. Full article
(This article belongs to the Special Issue Mechanical Properties of Materials and Symmetry/Asymmetry)
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12 pages, 2354 KiB  
Article
Chemical Composition Optimization of Biocompatible Non-Equiatomic High-Entropy Alloys Using Machine Learning and First-Principles Calculations
by Gengzhu Zhou, Zili Zhang, Renyao Feng, Wenjie Zhao, Shenyou Peng, Jia Li, Feifei Fan and Qihong Fang
Symmetry 2023, 15(11), 2029; https://doi.org/10.3390/sym15112029 - 8 Nov 2023
Cited by 1 | Viewed by 875
Abstract
Obtaining a suitable chemical composition for high-entropy alloys (HEAs) with superior mechanical properties and good biocompatibility is still a formidable challenge through conventional trial-and-error methods. Here, based on a large amount of experimental data, a machine learning technique may be used to establish [...] Read more.
Obtaining a suitable chemical composition for high-entropy alloys (HEAs) with superior mechanical properties and good biocompatibility is still a formidable challenge through conventional trial-and-error methods. Here, based on a large amount of experimental data, a machine learning technique may be used to establish the relationship between the composition and the mechanical properties of the biocompatible HEAs. Subsequently, first-principles calculations are performed to verify the accuracy of the prediction results from the machine learning model. The predicted Young’s modulus and yield strength of HEAs performed very well in the previous experiments. In addition, the effect on the mechanical properties of alloying an element is investigated in the selected Ti-Zr-Hf-Nb-Ta HEA with the high crystal symmetry. Finally, the Ti8-Zr20-Hf16-Nb35-Ta21 HEA predicted by the machine learning model exhibits a good combination of biocompatibility and mechanical performance, attributed to a significant electron flow and charge recombination. This work reveals the importance of these strategies, combined with machine learning and first-principles calculations, on the development of advanced biocompatible HEAs. Full article
(This article belongs to the Special Issue Mechanical Properties of Materials and Symmetry/Asymmetry)
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12 pages, 4320 KiB  
Article
Study on Water Jet Characteristics of Square Nozzle Based on CFD and Particle Image Velocimetry
by Zhuo Fu, Kun Li, Yongjun Pang, Liyong Ma, Zhanying Wang and Bin Jiang
Symmetry 2022, 14(11), 2392; https://doi.org/10.3390/sym14112392 - 12 Nov 2022
Cited by 4 | Viewed by 1654
Abstract
Water jet technology is widely used in various fields, in which the nozzle is an important element to form the jet. To solve the problem of low water jet operation efficiency of square nozzles, the internal flow channel structure of the nozzle of [...] Read more.
Water jet technology is widely used in various fields, in which the nozzle is an important element to form the jet. To solve the problem of low water jet operation efficiency of square nozzles, the internal flow channel structure of the nozzle of the key jet device is studied. Through the combination of computational fluid dynamics (CFD) and particle image velocimetry (PIV) experiments, the influence of main structural parameters such as the contraction angle and length-to-diameter ratio of the inner flow channel on the velocity and length of the constant-velocity core region is explored. Since the jet flow structure is a symmetrical structure along the axial direction, the model of the jet flow structure was built half of the model along the axial direction. The results show that a smaller length-to-diameter ratio and a smaller contraction angle of the nozzle result in better jet cohesion and lower dynamic pressure in the constant-velocity core area, which is more suitable for long-distance, low-pressure water jet operations. Full article
(This article belongs to the Special Issue Mechanical Properties of Materials and Symmetry/Asymmetry)
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