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An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism

A new 2D microstructure is proposed herein in the form of rigid unit cells, each taking the form of a cross with two opposing crossbars forming slots and the other two opposing crossbars forming sliders. The unit cells in the microstructure are arranged in a rectangular array in which the nearest fo...

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Autor principal: Lim, Teik-Cheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384895/
https://www.ncbi.nlm.nih.gov/pubmed/30704143
http://dx.doi.org/10.3390/ma12030429
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author Lim, Teik-Cheng
author_facet Lim, Teik-Cheng
author_sort Lim, Teik-Cheng
collection PubMed
description A new 2D microstructure is proposed herein in the form of rigid unit cells, each taking the form of a cross with two opposing crossbars forming slots and the other two opposing crossbars forming sliders. The unit cells in the microstructure are arranged in a rectangular array in which the nearest four neighboring cells are rotated by 90° such that a slider in each unit cell is connected to a slot from its nearest neighbor. Using a kinematics approach, the Poisson’s ratio along the axes of symmetry can be obtained, while the off-axis Poisson’s ratio is obtained using Mohr’s circle. In the special case of a square array, the results show that the Poisson’s ratio varies between 0 (for loading parallel to the axes) and −1 (for loading at 45° from the axes). For a rectangular array, the Poisson’s ratio varies from 0 (for loading along the axes) to a value more negative than −1. The obtained results suggest the proposed microstructure is useful for designing materials that permit rapid change in Poisson’s ratio for angular change.
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spelling pubmed-63848952019-02-23 An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism Lim, Teik-Cheng Materials (Basel) Article A new 2D microstructure is proposed herein in the form of rigid unit cells, each taking the form of a cross with two opposing crossbars forming slots and the other two opposing crossbars forming sliders. The unit cells in the microstructure are arranged in a rectangular array in which the nearest four neighboring cells are rotated by 90° such that a slider in each unit cell is connected to a slot from its nearest neighbor. Using a kinematics approach, the Poisson’s ratio along the axes of symmetry can be obtained, while the off-axis Poisson’s ratio is obtained using Mohr’s circle. In the special case of a square array, the results show that the Poisson’s ratio varies between 0 (for loading parallel to the axes) and −1 (for loading at 45° from the axes). For a rectangular array, the Poisson’s ratio varies from 0 (for loading along the axes) to a value more negative than −1. The obtained results suggest the proposed microstructure is useful for designing materials that permit rapid change in Poisson’s ratio for angular change. MDPI 2019-01-30 /pmc/articles/PMC6384895/ /pubmed/30704143 http://dx.doi.org/10.3390/ma12030429 Text en © 2019 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lim, Teik-Cheng
An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism
title An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism
title_full An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism
title_fullStr An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism
title_full_unstemmed An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism
title_short An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism
title_sort anisotropic auxetic 2d metamaterial based on sliding microstructural mechanism
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384895/
https://www.ncbi.nlm.nih.gov/pubmed/30704143
http://dx.doi.org/10.3390/ma12030429
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