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Crystals
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Crystalline Patterns as Bases for Design of Engineering Structures, Mechanisms...
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Crystalline Patterns as Bases for Design of Engineering Structures, Mechanisms and Metamaterials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (10 December 2021) | Viewed by 10606

Special Issue Editors

Dr. Pooya Sareh

E-Mail Website
Guest Editor
School of Engineering, University of Liverpool, London EC2A 1AG, UK
Interests: symmetry; patterns; tessellations; transformable/deployable structures; metamaterials
Prof. Dr. Yao Chen

E-Mail Website
Guest Editor
School of Civil Engineering, Southeast University, Nanjing 211189, China
Interests: symmetry; origami; tensegrity; deployable structures; metamaterials

Special Issue Information

Dear Colleagues,

The symmetry of crystals has inspired the design of various artworks, structures, and human-made objects. This topic focuses on the use of crystallographic patterns—and their associated symmetry information—in the design and development of 2D and 3D engineering structures, mechanisms, and metamaterials. We are interested in the design process of such systems using crystallographic data, as well as in the analytical, numerical, and experimental evaluation of outputs of such design processes.

Dr. Pooya Sareh
Prof. Dr. Yao Chen
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. Crystals 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 2100 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
  • Group theory
  • Tessellation
  • Tiling
  • Crystallography
  • Wallpaper patterns
  • Origami
  • Transformable/deployable structures
  • Metamaterials
  • Mechanical design
  • Deployable structures

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Published Papers (3 papers)

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Research

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10 pages, 5736 KiB  
Article
Ultrathin and Optically Transparent Microwave Absorber Based on Flexible Silver Nanowire Film
by Yanfei Dong, Dingwang Yu, Guochao Li, Yulin Cao, Youde Ruan and Mingtuan Lin
Crystals 2021, 11(12), 1583; https://doi.org/10.3390/cryst11121583 - 19 Dec 2021
Cited by 5 | Viewed by 2518
Abstract
The design of an optically transparent and flexible metamaterial absorber was presented and fabricated. For this purpose, we use two different patterned silver nanowire films separated by the space layer, forming a transparent sandwiched structure with an ultrathin thickness. By analyzing the equivalent [...] Read more.
The design of an optically transparent and flexible metamaterial absorber was presented and fabricated. For this purpose, we use two different patterned silver nanowire films separated by the space layer, forming a transparent sandwiched structure with an ultrathin thickness. By analyzing the equivalent circuit model and distribution of electric field and current, the absorption physical mechanism has been theoretically investigated. The results show that the structure can achieve above 0.8 absorptions from 6 GHz to 18 GHz, and at the same time, this absorber also can obtain wide-angle property. The optical transmittance of the fabricated absorber exceeds 82% in the visible band. The results demonstrate that transparency and flexibility are the additional benefits that make the proposed absorber suitable for various potential applications. Full article
(This article belongs to the Special Issue Crystalline Patterns as Bases for Design of Engineering Structures, Mechanisms and Metamaterials)
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9 pages, 3664 KiB  
Article
The Construction of the Origami Level-n Menger Sponge Complement by the PJS Technique
by Serena Cicalò
Crystals 2021, 11(5), 468; https://doi.org/10.3390/cryst11050468 - 22 Apr 2021
Cited by 2 | Viewed by 4606
Abstract
In 2015, the author developed a new origami technique, called PJS technique (where PJS stands for “pleat and join strips”), by which we can construct polycubes, that are polyhedrons composed of elementary cubes, called units, connected face to face. Each strip, pleated in [...] Read more.
In 2015, the author developed a new origami technique, called PJS technique (where PJS stands for “pleat and join strips”), by which we can construct polycubes, that are polyhedrons composed of elementary cubes, called units, connected face to face. Each strip, pleated in squares, has to cover four faces of a tower of stacked units, called a segment, having as length the number of units that form the tower. Each unit is composed by weaving together three paper strips in the three spatial directions and the length of each strip depends on the length of the segment in each respective direction. The PJS technique allowed the author to build, at the end of 2016, the first specimen of a level-4 origami Menger sponge and three yeas later, the first level-3 complement model. In this paper, we give a formula to compute the number of segments that make up a level-n Menger sponge complement in all directions and consequently, the number of modules needed for each length to build this polycube with the PJS technique. Full article
(This article belongs to the Special Issue Crystalline Patterns as Bases for Design of Engineering Structures, Mechanisms and Metamaterials)
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Review

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14 pages, 1347 KiB  
Review
Strain Accommodations among Twin Variants in Ti and Mg
by Ping Zhou and Guo-Zhen Zhu
Crystals 2021, 11(4), 453; https://doi.org/10.3390/cryst11040453 - 20 Apr 2021
Cited by 5 | Viewed by 2515
Abstract
The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited and twinning types are abundant during deformation. Local strain accommodations among twin variants are considered to shed light on variant [...] Read more.
The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited and twinning types are abundant during deformation. Local strain accommodations among twin variants are considered to shed light on variant selection rules in Ti and Mg alloys. Five kinds of strain accommodations are discussed in terms of different regions that are affected by the twinning shear of primary twin. These regions contain (I) the whole sample, (II) neighboring grain, (III) adjacent primary twin in neighboring grain, (IV) adjoining primary twin within the same parent grain, and (V) multi-generation of twinning inside the primary twin. For a potentially active variant, its operation needs not only relatively higher resolved shear stress but also easily accommodated strain by immediate vicinity. Many of the non-Schmid behaviors could be elucidated by local strain accommodations that variants with relatively higher SFs hard to be accommodated are absent, while those with relatively lower SFs but could be easily accommodated are present. Full article
(This article belongs to the Special Issue Crystalline Patterns as Bases for Design of Engineering Structures, Mechanisms and Metamaterials)
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