A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility

Auxetics (negative Poisson’s ratio) and materials with negative linear compressibility (NLC) exhibit the anomalous mechanical properties of getting wider rather than thinner when stretched and expanding in at least one direction under hydrostatic pressure, respectively. A novel mechanism&a...

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Main Authors: James N. Grima-Cornish, Joseph N. Grima, Daphne Attard
Format: Article
Language:English
Published: MDPI AG 2019-12-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/13/1/79
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spelling doaj-1f4d9e2a173648a38c7939e3c7664ed32020-11-24T21:03:46ZengMDPI AGMaterials1996-19442019-12-011317910.3390/ma13010079ma13010079A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative CompressibilityJames N. Grima-Cornish0Joseph N. Grima1Daphne Attard2Metamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, MaltaMetamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, MaltaMetamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, MaltaAuxetics (negative Poisson’s ratio) and materials with negative linear compressibility (NLC) exhibit the anomalous mechanical properties of getting wider rather than thinner when stretched and expanding in at least one direction under hydrostatic pressure, respectively. A novel mechanism—termed the ‘triangular elongation mechanism’—leading to such anomalous behavior is presented and discussed through an analytical model. Amongst other things, it is shown that this novel mechanism, when combined with the well-known ‘rotating squares’ model, can generate giant negative Poisson’s ratios when the system is stretched.https://www.mdpi.com/1996-1944/13/1/79auxeticnegative poisson’s rationegative compressibility
collection DOAJ
language English
format Article
sources DOAJ
author James N. Grima-Cornish
Joseph N. Grima
Daphne Attard
spellingShingle James N. Grima-Cornish
Joseph N. Grima
Daphne Attard
A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility
Materials
auxetic
negative poisson’s ratio
negative compressibility
author_facet James N. Grima-Cornish
Joseph N. Grima
Daphne Attard
author_sort James N. Grima-Cornish
title A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility
title_short A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility
title_full A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility
title_fullStr A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility
title_full_unstemmed A Novel Mechanical Metamaterial Exhibiting Auxetic Behavior and Negative Compressibility
title_sort novel mechanical metamaterial exhibiting auxetic behavior and negative compressibility
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-12-01
description Auxetics (negative Poisson’s ratio) and materials with negative linear compressibility (NLC) exhibit the anomalous mechanical properties of getting wider rather than thinner when stretched and expanding in at least one direction under hydrostatic pressure, respectively. A novel mechanism—termed the ‘triangular elongation mechanism’—leading to such anomalous behavior is presented and discussed through an analytical model. Amongst other things, it is shown that this novel mechanism, when combined with the well-known ‘rotating squares’ model, can generate giant negative Poisson’s ratios when the system is stretched.
topic auxetic
negative poisson’s ratio
negative compressibility
url https://www.mdpi.com/1996-1944/13/1/79
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