Special Issue "Designing and Manufacturing Hard and Soft Mechanical Metamaterials"

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

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editor

Dr. Reza Hedayati
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Guest Editor
Faculty of Aerospace Engineering, Delft University of Technology (TU Delft), Kluyverweg 1, 2629 HS Delft, The Netherlands
Interests: mechanical metamaterials; acoustic metamaterials; additive manufacturing; computational mechanics
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Mechanical metamaterials are rationally designed materials composed of periodically repeating elements that are engineered to present exotic properties that cannot be found in nature. The apparent properties of mechanical metamaterials have a stronger dependency on their microgeometrical features rather than the base material they are made of. Even though several theoretical and conceptual designs have been presented since decades ago, many types of metamaterials have not been realized until very recently, mainly due to limitations in manufacturing and sufficient computing power.

Recent advancements in manufacturing technologies including additive manufacturing, lithography techniques, macro-, micro-, and nanofabrication techniques, and new material developments have enabled manufacturing of many new types of mechanical metamaterials with advanced functionalities and attractive properties never seen before.

This Special Issue explores the latest advances in designing and manufacturing of such functional structures made of metals, polymers, ceramics, etc. Such metamaterials can be either passive (keep their shape during their application) or active (change their shape upon request by the user).

Dr. Reza Hedayati
Guest Editor

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 papers will be 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 2000 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

  • Designer materials
  • Mechanical metamaterials
  • Advanced manufacturing
  • Advanced materials
  • Metasurfaces
  • Additive manufacturing
  • Biomaterials
  • Nanotechnology
  • Flexible and stretchable bioelectronic devices
  • Shape memory materials
  • Self-assembling soft structures
  • Origami and Kirigami
  • Soft robotics
  • Micro-to-nano fabrication of soft biomaterials

Published Papers (1 paper)

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Research

Open AccessArticle
Pneumatically-Actuated Acoustic Metamaterials Based on Helmholtz Resonators
Materials 2020, 13(6), 1456; https://doi.org/10.3390/ma13061456 - 23 Mar 2020
Abstract
Metamaterials are periodic structures which offer physical properties not found in nature. Particularly, acoustic metamaterials can manipulate sound and elastic waves both spatially and spectrally in unpreceded ways. Acoustic metamaterials can generate arbitrary acoustic bandgaps by scattering sound waves, which is a superior [...] Read more.
Metamaterials are periodic structures which offer physical properties not found in nature. Particularly, acoustic metamaterials can manipulate sound and elastic waves both spatially and spectrally in unpreceded ways. Acoustic metamaterials can generate arbitrary acoustic bandgaps by scattering sound waves, which is a superior property for insulation properties. In this study, one dimension of the resonators (depth of cavity) was altered by means of a pneumatic actuation system. To this end, metamaterial slabs were additively manufactured and connected to a proportional pressure control unit. The noise reduction performance of active acoustic metamaterials in closed- and open-space configurations was measured in different control conditions. The pneumatic actuation system was used to vary the pressure behind pistons inside each cell of the metamaterial, and as a result to vary the cavity depth of each unit cell. Two pressures were considered, P = 0.05 bar, which led to higher depth of the cavities, and P = 0.15 bar, which resulted in lower depth of cavities. The results showed that by changing the pressure from P = 0.05 (high cavity depth) to P = 0.15 (low cavity depth), the acoustic bandgap can be shifted from a frequency band of 150–350 Hz to a frequency band of 300–600 Hz. The pneumatically-actuated acoustical metamaterial gave a peak attenuation of 20 dB (at 500 Hz) in the closed system and 15 dB (at 500 Hz) in the open system. A step forward would be to tune different unit cells of the metamaterial with different pressure levels (and therefore different cavity depths) in order to target a broader range of frequencies. Full article
(This article belongs to the Special Issue Designing and Manufacturing Hard and Soft Mechanical Metamaterials)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Pneumatically-actuated Acoustic Metamaterials Based on Helmholtz Resonators

Reza Hedayati

Faculty of Aerospace Engineering, Delft University of Technology (TU Delft), Delft, The Netherlands

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