Cargando…
Strain rate–dependent mechanical metamaterials
Mechanical metamaterials are usually designed to exhibit novel properties and functionalities that are rare or even unprecedented. What is common among most previous designs is the quasi-static nature of their mechanical behavior. Here, we introduce a previously unidentified class of strain rate-dep...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7299623/ https://www.ncbi.nlm.nih.gov/pubmed/32596451 http://dx.doi.org/10.1126/sciadv.aba0616 |
_version_ | 1783547426718613504 |
---|---|
author | Janbaz, S. Narooei, K. van Manen, T. Zadpoor, A. A. |
author_facet | Janbaz, S. Narooei, K. van Manen, T. Zadpoor, A. A. |
author_sort | Janbaz, S. |
collection | PubMed |
description | Mechanical metamaterials are usually designed to exhibit novel properties and functionalities that are rare or even unprecedented. What is common among most previous designs is the quasi-static nature of their mechanical behavior. Here, we introduce a previously unidentified class of strain rate-dependent mechanical metamaterials. The principal idea is to laterally attach two beams with very different levels of strain rate-dependencies to make them act as a single bi-beam. We use an analytical model and multiple computational models to explore the instability modes of such a bi-beam construct, demonstrating how different combinations of hyperelastic and viscoelastic properties of both beams, as well as purposefully introduced geometric imperfections, could be used to create robust and highly predictable strain rate-dependent behaviors of bi-beams. We then use the bi-beams to design and experimentally realize lattice structures with unique strain rate-dependent properties including switching between auxetic and conventional behaviors and negative viscoelasticity. |
format | Online Article Text |
id | pubmed-7299623 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-72996232020-06-25 Strain rate–dependent mechanical metamaterials Janbaz, S. Narooei, K. van Manen, T. Zadpoor, A. A. Sci Adv Research Articles Mechanical metamaterials are usually designed to exhibit novel properties and functionalities that are rare or even unprecedented. What is common among most previous designs is the quasi-static nature of their mechanical behavior. Here, we introduce a previously unidentified class of strain rate-dependent mechanical metamaterials. The principal idea is to laterally attach two beams with very different levels of strain rate-dependencies to make them act as a single bi-beam. We use an analytical model and multiple computational models to explore the instability modes of such a bi-beam construct, demonstrating how different combinations of hyperelastic and viscoelastic properties of both beams, as well as purposefully introduced geometric imperfections, could be used to create robust and highly predictable strain rate-dependent behaviors of bi-beams. We then use the bi-beams to design and experimentally realize lattice structures with unique strain rate-dependent properties including switching between auxetic and conventional behaviors and negative viscoelasticity. American Association for the Advancement of Science 2020-06-17 /pmc/articles/PMC7299623/ /pubmed/32596451 http://dx.doi.org/10.1126/sciadv.aba0616 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Janbaz, S. Narooei, K. van Manen, T. Zadpoor, A. A. Strain rate–dependent mechanical metamaterials |
title | Strain rate–dependent mechanical metamaterials |
title_full | Strain rate–dependent mechanical metamaterials |
title_fullStr | Strain rate–dependent mechanical metamaterials |
title_full_unstemmed | Strain rate–dependent mechanical metamaterials |
title_short | Strain rate–dependent mechanical metamaterials |
title_sort | strain rate–dependent mechanical metamaterials |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7299623/ https://www.ncbi.nlm.nih.gov/pubmed/32596451 http://dx.doi.org/10.1126/sciadv.aba0616 |
work_keys_str_mv | AT janbazs strainratedependentmechanicalmetamaterials AT narooeik strainratedependentmechanicalmetamaterials AT vanmanent strainratedependentmechanicalmetamaterials AT zadpooraa strainratedependentmechanicalmetamaterials |