Multilayered recoverable sandwich composite structures with architected core

In this paper, we propose a novel design and fabrication strategy to produce architected structures for use as the core in composite sandwich structures. A traditional foam core or honeycomb structure is lightweight and stiff, but susceptible to permanent deformation when subjected to excessive load...

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Auteurs principaux:	Vinay Damodaran, Anna G. Hahm, Pavana Prabhakar
Format:	article
Langue:	EN
Publié:	Elsevier 2021
Sujets:	Architected materials Composite sandwich structures Structural recovery Pseudo-bistability Materials of engineering and construction. Mechanics of materials TA401-492
Accès en ligne:	https://doaj.org/article/ee3de2f574de4d0b8197b8007a6959d7
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id	oai:doaj.org-article:ee3de2f574de4d0b8197b8007a6959d7
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spelling	oai:doaj.org-article:ee3de2f574de4d0b8197b8007a6959d72021-12-02T04:59:00ZMultilayered recoverable sandwich composite structures with architected core0264-127510.1016/j.matdes.2021.110268https://doaj.org/article/ee3de2f574de4d0b8197b8007a6959d72021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0264127521008236https://doaj.org/toc/0264-1275In this paper, we propose a novel design and fabrication strategy to produce architected structures for use as the core in composite sandwich structures. A traditional foam core or honeycomb structure is lightweight and stiff, but susceptible to permanent deformation when subjected to excessive loading. Here we propose the use of an architected structure composed of arrays of hollow truncated cone unit cells that dissipate energy and exhibit structural recovery. These structures, printed with a viscoelastic material, rely on buckling of their sidewalls to dissipate energy and snap-back to prevent permanent deformation. We explore the mechanical response of these conical unit cells in terms of their buckling strength and post-buckling stability condition and develop design maps for the same by relating them to non-dimensional geometric parameters α,β,γ where α represents the slenderness of the curved sidewalls, β is the angle of the sidewall to the base, and γ represents the curvature of the sidewall. A validated finite element model is developed and used to investigate the effect of these parameters. We show that the volume normalized peak buckling load is directly proportional to both α & β, but is independent of γ. The post-buckling stability is influenced by γ as a large radius of curvature makes the structure less likely to exhibit structural bistability. Due to viscoelastic dissipation, for certain geometric parameters, the structures exhibit pseudo-bistability which allows them to recover to their original configurations without the need for external stimuli or energy.Vinay DamodaranAnna G. HahmPavana PrabhakarElsevierarticleArchitected materialsComposite sandwich structuresStructural recoveryPseudo-bistabilityMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110268- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Architected materials Composite sandwich structures Structural recovery Pseudo-bistability Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Architected materials Composite sandwich structures Structural recovery Pseudo-bistability Materials of engineering and construction. Mechanics of materials TA401-492 Vinay Damodaran Anna G. Hahm Pavana Prabhakar Multilayered recoverable sandwich composite structures with architected core
description	In this paper, we propose a novel design and fabrication strategy to produce architected structures for use as the core in composite sandwich structures. A traditional foam core or honeycomb structure is lightweight and stiff, but susceptible to permanent deformation when subjected to excessive loading. Here we propose the use of an architected structure composed of arrays of hollow truncated cone unit cells that dissipate energy and exhibit structural recovery. These structures, printed with a viscoelastic material, rely on buckling of their sidewalls to dissipate energy and snap-back to prevent permanent deformation. We explore the mechanical response of these conical unit cells in terms of their buckling strength and post-buckling stability condition and develop design maps for the same by relating them to non-dimensional geometric parameters α,β,γ where α represents the slenderness of the curved sidewalls, β is the angle of the sidewall to the base, and γ represents the curvature of the sidewall. A validated finite element model is developed and used to investigate the effect of these parameters. We show that the volume normalized peak buckling load is directly proportional to both α & β, but is independent of γ. The post-buckling stability is influenced by γ as a large radius of curvature makes the structure less likely to exhibit structural bistability. Due to viscoelastic dissipation, for certain geometric parameters, the structures exhibit pseudo-bistability which allows them to recover to their original configurations without the need for external stimuli or energy.
format	article
author	Vinay Damodaran Anna G. Hahm Pavana Prabhakar
author_facet	Vinay Damodaran Anna G. Hahm Pavana Prabhakar
author_sort	Vinay Damodaran
title	Multilayered recoverable sandwich composite structures with architected core
title_short	Multilayered recoverable sandwich composite structures with architected core
title_full	Multilayered recoverable sandwich composite structures with architected core
title_fullStr	Multilayered recoverable sandwich composite structures with architected core
title_full_unstemmed	Multilayered recoverable sandwich composite structures with architected core
title_sort	multilayered recoverable sandwich composite structures with architected core
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/ee3de2f574de4d0b8197b8007a6959d7
work_keys_str_mv	AT vinaydamodaran multilayeredrecoverablesandwichcompositestructureswitharchitectedcore AT annaghahm multilayeredrecoverablesandwichcompositestructureswitharchitectedcore AT pavanaprabhakar multilayeredrecoverablesandwichcompositestructureswitharchitectedcore
_version_	1718400925618405376

Multilayered recoverable sandwich composite structures with architected core

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