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Mechanical Metamaterials and Their Applications
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Mechanical Metamaterials and Their Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Smart Materials".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 5116

Special Issue Editors

Dr. Hamdi Torun

E-Mail Website
Guest Editor
Affiliation: Smart Materials & Surfaces Laboratory, Faculty of Engineering & Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, U.K.
Interests: metamaterials; sensors; microengineering; acoustofluidics
Special Issues, Collections and Topics in MDPI journals
Dr. Huijuan Feng

E-Mail Website
Guest Editor
Smart Materials & Surfaces Laboratory, Faculty of Engineering & Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
Interests: origami structures; metamaterials; deployable structures; origami robots; reconfigurable mechanisms and robotics
Prof. Dr. Richard Yongqing Fu

E-Mail Website
Guest Editor
Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
Interests: smart thin films/materials; lab-on-chip; MEMS; nanotechnology; sensors and microfluidics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue aims to bring together the theory, concept, and applications of mechanical metamaterials.

Mechanical metamaterials are an emerging field where engineered structures enable unique and rather exotic material properties, such as introducing a negative Poisson’s ratio and negative compressibility. Mechanical design of structures can introduce these properties, allowing us to develop functional materials for a wide range of applications in bioengineering, energy, and acoustics, to name a few. So far, various structures have been demonstrated from nano- to macro-scales as functional materials with engineered properties. These structures, usually in a periodic lattice formation, have been introduced using various manufacturing techniques, including 3D printing, micromachining, and nanofabrication. Once the structure is manufactured, it is also feasible to change its material properties on demand using transduction mechanisms for tunability.

It is our pleasure to invite you to submit a manuscript for this Special Issue. Fundamental and applied research covering design, simulation, fabrication, and characterization of mechanical metamaterials from nano- to macro-scale, including their applications, will be covered comprehensively. Full papers, communications, and reviews are all welcome.

Dr. Hamdi Torun
Dr. Huijuan Feng
Prof. Dr. Richard Yongqing Fu
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. Materials 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 2600 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

  • Mechanical metamaterials
  • Functional materials
  • Programmable materials
  • Microlattice
  • Chirality
  • Origami
  • 3D printing

Published Papers (2 papers)

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Research

18 pages, 7125 KiB  
Article
An Experimental Study of Auxetic Tubular Structures
by Julian Plewa, Małgorzata Płońska and Kamil Feliksik
Materials 2022, 15(15), 5245; https://doi.org/10.3390/ma15155245 - 29 Jul 2022
Cited by 7 | Viewed by 1512
Abstract
Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s ratio upon stretching and deformation in the axial and transverse directions, which have numerous application possibilities. In this paper, tubular structures were realized by rolling up planar auxetic structures and using [...] Read more.
Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s ratio upon stretching and deformation in the axial and transverse directions, which have numerous application possibilities. In this paper, tubular structures were realized by rolling up planar auxetic structures and using rigid square frames as unit cells. Planar and tubular structures were built from square frames that were 3D printed with plastic or laser-cut from metal. The changes in linear dimensions of the studied structures were based on a hinge mechanism, the functioning of which was experimentally verified on different solutions leading to square unit cells. To connect the square frames of the structure, an innovative solution was used in the form of rotation axes on their surface at a preset distance from the edge of the square frame. The geometric parameter thus introduced was used to determine the relative change in the size of the structure when stretched (i.e., when moving from the closed to the open position). Full article
(This article belongs to the Special Issue Mechanical Metamaterials and Their Applications)
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20 pages, 4027 KiB  
Article
Design for Additive Manufacturing and Investigation of Surface-Based Lattice Structures for Buckling Properties Using Experimental and Finite Element Methods
by Gul Jamil Shah, Aamer Nazir, Shang-Chih Lin and Jeng-Ywan Jeng
Materials 2022, 15(11), 4037; https://doi.org/10.3390/ma15114037 - 06 Jun 2022
Cited by 8 | Viewed by 2500
Abstract
Additive Manufacturing (AM) is rapidly evolving due to its unlimited design freedom to fabricate complex and intricate light-weight geometries with the use of lattice structure that have potential applications including construction, aerospace and biomedical applications, where mechanical properties are the prime focus. Buckling [...] Read more.
Additive Manufacturing (AM) is rapidly evolving due to its unlimited design freedom to fabricate complex and intricate light-weight geometries with the use of lattice structure that have potential applications including construction, aerospace and biomedical applications, where mechanical properties are the prime focus. Buckling instability in lattice structures is one of the main failure mechanisms that can lead to major failure in structural applications that are subjected to compressive loads, but it has yet to be fully explored. This study aims to investigate the effect of surface-based lattice structure topologies and structured column height on the critical buckling load of lattice structured columns. Four different triply periodic minimal surface (TPMS) lattice topologies were selected and three design configurations (unit cells in x, y, z axis), i.e., 2 × 2 × 4, 2 × 2 × 8 and 2 × 2 × 16 column, for each structure were designed followed by printing using HP MultiJet fusion. Uni-axial compression testing was performed to study the variation in critical buckling load due to change in unit cell topology and column height. The results revealed that the structured column possessing Diamond structures shows the highest critical buckling load followed by Neovius and Gyroid structures, whereas the Schwarz-P unit cell showed least resistance to buckling among the unit cells analyzed in this study. In addition to that, the Diamond design showed a uniform decrease in critical buckling load with a column height maximum of 5193 N, which makes it better for applications in which the column’s height is relatively higher while the Schwarz-P design showed advantages for low height column maximum of 2271 N. Overall, the variations of unit cell morphologies greatly affect the critical buckling load and permits the researchers to select different lattice structures for various applications as per load/stiffness requirement with different height and dimensions. Experimental results were validated by finite element analysis (FEA), which showed same patterns of buckling while the numerical values of critical buckling load show the variation to be up to 10%. Full article
(This article belongs to the Special Issue Mechanical Metamaterials and Their Applications)
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