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In-plane elastic responses of circular cell honeycombs and bundled circular tubes in a diamond array structure

Gotkhindi, Tejas P and Simha, KRY (2015) In-plane elastic responses of circular cell honeycombs and bundled circular tubes in a diamond array structure. In: COMPOSITE STRUCTURES, 134 . pp. 311-330.

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Official URL: http://dx.doi.org/10.1016/j.compstruct.2015.08.066...


Assemblages of circular tubes and circular honeycombs in close packed arrangement are presently both competing and complementing regular honeycomb structures (HCS). The intrinsic isotropy of bundled tubes/rings in hexagonal arrays restricts their use to applications with isotopic need. With the aim of extending the utility of tubes/rings assemblages to anisotropic needs, this paper explores the prospects of bundled tubes and circular honeycombs in a general diamond array structure (DAS) to cater these needs. To this end, effective transverse Young's moduli and Poisson's ratio for thick/thin DAS are obtained theoretically. Analysis frameworks including thin ring theory (TRT), curved beam theory (CBT) and elasticity formulations are tested and corroborated by FEA employing contact elements. Results indicate that TRT and CBT are reasonable for thin tubes and honeycombs. Nevertheless, TRT yields compact formulae to study the anisotropy ratio, moduli spectrum and sensitivity of the assemblage as a function of thicknesses and array structure. These formulae supplement designers as a guide to tailor the structures. On the other hand, elasticity formulation can estimate over a larger range including very thick tubes/rings. In addition, this formulation offers to estimate refined transverse strengths of assemblages. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords: Circular honeycomb/tubular structures; Anisotropy ratio; In-plane mechanical properties; Analytical modelling; Elasticity; Design maps
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 02 Dec 2015 08:21
Last Modified: 02 Dec 2015 08:21
URI: http://eprints.iisc.ac.in/id/eprint/52833

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