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Curved bistable composite slit tubes with positive Gaussian curvature

Knott, Geoffrey and Viquerat, Andrew (2017) Curved bistable composite slit tubes with positive Gaussian curvature AIAA Journal, 56 (4). pp. 1679-1688.

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Abstract

An investigation into the bistability of positively curved laminated composite slit tubes is presented, establishing a natural extension in this area that has previously been focused on straight tubes. Curved slit tubes are modeled as the surface segments of a torus. The design space is explored through a parametric study to investigate the effect on the second stable state, representing a small coil. This includes the effects of longitudinal curvature, cross-section subtending angles, nonuniform transverse curvature, and spatially varying laminate properties. The second equilibrium state is determined through strain energy minimization using the Rayleigh–Ritz method. To verify the model, samples are manufactured from glass-fiber braid and polypropylene resin. This investigation finds 1) the initial curvature along the length of the tube has little effect on coil radius, however, the coil has a distinct barrel shape; 2) highly enclosed and 3) highly curved cross-sections result in higher edge strains of the second equilibrium, enabling identification of practical bistable tubes; and 4) conversely, the greater the initial curvature along the length of the tube, the lower the second equilibrium strain.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Knott, Geoffreyg.knott@surrey.ac.uk
Viquerat, Andrewa.viquerat@surrey.ac.uk
Date : 22 December 2017
Funders : Engineering and Physical Sciences Research Council (EPSRC)
Identification Number : 10.2514/1.J056411
Copyright Disclaimer : Copyright © 2017 by G. Knott and A. Viquerat. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the ISSN 0001-1452 (print) or 1533-385X (online) to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.
Depositing User : Clive Harris
Date Deposited : 20 Nov 2017 14:38
Last Modified : 30 Apr 2018 11:17
URI: http://epubs.surrey.ac.uk/id/eprint/844956

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