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Frictional Damping from Biomimetic Scales

Stiff scales adorn the exterior surfaces of fishes, snakes, and many reptiles. They provide protection from external piercing attacks and control over global deformation behavior to aid locomotion, slithering, and swimming across a wide range of environmental condition. In this report, we investigat...

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Detalles Bibliográficos
Autores principales: Ali, Hessein, Ebrahimi, Hossein, Ghosh, Ranajay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787062/
https://www.ncbi.nlm.nih.gov/pubmed/31601852
http://dx.doi.org/10.1038/s41598-019-50944-0
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author Ali, Hessein
Ebrahimi, Hossein
Ghosh, Ranajay
author_facet Ali, Hessein
Ebrahimi, Hossein
Ghosh, Ranajay
author_sort Ali, Hessein
collection PubMed
description Stiff scales adorn the exterior surfaces of fishes, snakes, and many reptiles. They provide protection from external piercing attacks and control over global deformation behavior to aid locomotion, slithering, and swimming across a wide range of environmental condition. In this report, we investigate the dynamic behavior of biomimetic scale substrates for further understanding the origins of the nonlinearity that involve various aspect of scales interaction, sliding kinematics, interfacial friction, and their combination. Particularly, we study the vibrational characteristics through an analytical model and numerical investigations for the case of a simply supported scale covered beam. Our results reveal for the first time that biomimetic scale beams exhibit viscous damping behavior even when only Coulomb friction is postulated for free vibrations. We anticipate and quantify the anisotropy in the damping behavior with respect to curvature. We also find that unlike static pure bending where friction increases bending stiffness, a corresponding increase in natural frequency for the dynamic case does not arise for simply supported beam. Since both scale geometry, distribution and interfacial properties can be easily tailored, our study indicates a biomimetic strategy to design exceptional synthetic materials with tailorable damping behavior.
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spelling pubmed-67870622019-10-17 Frictional Damping from Biomimetic Scales Ali, Hessein Ebrahimi, Hossein Ghosh, Ranajay Sci Rep Article Stiff scales adorn the exterior surfaces of fishes, snakes, and many reptiles. They provide protection from external piercing attacks and control over global deformation behavior to aid locomotion, slithering, and swimming across a wide range of environmental condition. In this report, we investigate the dynamic behavior of biomimetic scale substrates for further understanding the origins of the nonlinearity that involve various aspect of scales interaction, sliding kinematics, interfacial friction, and their combination. Particularly, we study the vibrational characteristics through an analytical model and numerical investigations for the case of a simply supported scale covered beam. Our results reveal for the first time that biomimetic scale beams exhibit viscous damping behavior even when only Coulomb friction is postulated for free vibrations. We anticipate and quantify the anisotropy in the damping behavior with respect to curvature. We also find that unlike static pure bending where friction increases bending stiffness, a corresponding increase in natural frequency for the dynamic case does not arise for simply supported beam. Since both scale geometry, distribution and interfacial properties can be easily tailored, our study indicates a biomimetic strategy to design exceptional synthetic materials with tailorable damping behavior. Nature Publishing Group UK 2019-10-10 /pmc/articles/PMC6787062/ /pubmed/31601852 http://dx.doi.org/10.1038/s41598-019-50944-0 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ali, Hessein
Ebrahimi, Hossein
Ghosh, Ranajay
Frictional Damping from Biomimetic Scales
title Frictional Damping from Biomimetic Scales
title_full Frictional Damping from Biomimetic Scales
title_fullStr Frictional Damping from Biomimetic Scales
title_full_unstemmed Frictional Damping from Biomimetic Scales
title_short Frictional Damping from Biomimetic Scales
title_sort frictional damping from biomimetic scales
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787062/
https://www.ncbi.nlm.nih.gov/pubmed/31601852
http://dx.doi.org/10.1038/s41598-019-50944-0
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