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Helical bistable composite slit tubes

Knott, Geoffrey and Viquerat, Andrew (2019) Helical bistable composite slit tubes Composite Structures, 207. pp. 711-726.

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Abstract

Bistability in doubly curved and twisted (helical) composite slit tubes is investigated for the first time. This work establishes a natural extension in this area which has been focused on straight and until more recently, doubly curved (toroidal) tubes with positive Gaussian curvature. The model developed introduces longitudinal and transverse curvature, and twist into strips of laminated composite material. The composite is engineered to be bistable and the second stable state determined via strain energy minimisation using the Rayleigh-Ritz method. The strain energy is formulated as a function of curvature strains, longitudinal stretching and a variable middle ply fibre angle of the laminate. The second stable state forms a compact and untwisted cylindrical coil with the latter engineered by tailoring the middle ply fibre angle. A new manufacturing process capable of producing helically curved tubes using glass-fibre/polypropylene-matrix composite is presented to verify the hypothesis of this work. An untwisted coil enables the efficient stowage and deployment of new forms of bistable composite tube which adhere to similar form factors as straight and toroidal ones. By embedding electrical conductors, helical bistable composites enable new lightweight, compact and multifunctional structures for communication and sensing applications.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Knott, Geoffreygeoffrey.knott@surrey.ac.uk
Viquerat, Andrewa.viquerat@surrey.ac.uk
Date : 21 September 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1016/j.compstruct.2018.09.045
Copyright Disclaimer : © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Uncontrolled Keywords : Helical; Doubly curved and twisted; Curvature; Bistable composites
Depositing User : Clive Harris
Date Deposited : 02 Oct 2018 14:09
Last Modified : 16 Sep 2019 07:50
URI: http://epubs.surrey.ac.uk/id/eprint/849489

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