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Special Issue Editor

Dr. Alireza Daman Pak

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Guest Editor

Department of Technology and Innovation, University of Southern Denmark, 5230 Odense, Denmark
Interests: metamaterials; lattice-based materials; shape memory materials; multifunctional structures; multiscale modeling; 3D/4D printing

Special Issue Information

Dear Colleagues,

Recent advances in material development and additive manufacturing have led to four-dimensional (4D) printing technology for creating metamaterials and smart structures that can change their shape and/or function on demand and over time. This emerging technique provides an effective means from idea to reality with performance-driven functionality built into the structures. In this respect, the material and fabrication characteristics as well as geometrical design play important roles. In this Special Issue, we focus on recent advances in the development, manufacturing, and characterization of advanced metamaterials in different research and industrial fields. Metamaterials and lattice-based structures can be designed to obtain either specific nonlinear elastic responses, such as auxetics with negative Poisson’s ratio or pentamodes with zero shear modulus, or nonlinear elastic behaviors under applied stress/temperature. They can also be used to drive programmable shape transformations under compression/tension in a monostable or multistable manner or under thermal loading. The application of novel smart and multifunctional structures includes but is not limited to aerospace, biomechanics, acoustics, and mechanical performance.

Dr. Alireza Daman Pak
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 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.

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Keywords

Metamaterials
Lattice-based materials
Shape memory materials
Multifunctional structures
Multiscale modeling
3D/4D printing

Published Papers (2 papers)

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Research

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8 pages, 3359 KiB

Open AccessArticle

Porous PLAs with Controllable Density by FDM 3D Printing and Chemical Foaming Agent

by A. R. Damanpack, André Sousa and M. Bodaghi

Micromachines 2021, 12(8), 866; https://0-doi-org.brum.beds.ac.uk/10.3390/mi12080866 - 23 Jul 2021

Cited by 27 | Viewed by 3808

Abstract

This paper shows how fused decomposition modeling (FDM), as a three-dimensional (3D) printing technology, can engineer lightweight porous foams with controllable density. The tactic is based on the 3D printing of Poly Lactic Acid filaments with a chemical blowing agent, as well as experiments to explore how FDM parameters can control material density. Foam porosity is investigated in terms of fabrication parameters such as printing temperature and flow rate, which affect the size of bubbles produced during the layer-by-layer fabrication process. It is experimentally shown that printing temperature and flow rate have significant effects on the bubbles’ size, micro-scale material connections, stiffness and strength. An analytical equation is introduced to accurately simulate the experimental results on flow rate, density, and mechanical properties in terms of printing temperature. Due to the absence of a similar concept, mathematical model and results in the specialized literature, this paper is likely to advance the state-of-the-art lightweight foams with controllable porosity and density fabricated by FDM 3D printing technology. Full article

(This article belongs to the Special Issue 3D/4D Printing of Metamaterials and Multifunctional Structures)

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Review

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45 pages, 13379 KiB

Open AccessFeature PaperEditor’s ChoiceReview

Additive Manufacture of Small-Scale Metamaterial Structures for Acoustic and Ultrasonic Applications

by Alicia Gardiner, Paul Daly, Roger Domingo-Roca, James F. C. Windmill, Andrew Feeney and Joseph C. Jackson-Camargo

Micromachines 2021, 12(6), 634; https://0-doi-org.brum.beds.ac.uk/10.3390/mi12060634 - 29 May 2021

Cited by 11 | Viewed by 7178

Abstract

Acoustic metamaterials are large-scale materials with small-scale structures. These structures allow for unusual interaction with propagating sound and endow the large-scale material with exceptional acoustic properties not found in normal materials. However, their multi-scale nature means that the manufacture of these materials is not trivial, often requiring micron-scale resolution over centimetre length scales. In this review, we bring together a variety of acoustic metamaterial designs and separately discuss ways to create them using the latest trends in additive manufacturing. We highlight the advantages and disadvantages of different techniques that act as barriers towards the development of realisable acoustic metamaterials for practical audio and ultrasonic applications and speculate on potential future developments. Full article

(This article belongs to the Special Issue 3D/4D Printing of Metamaterials and Multifunctional Structures)

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