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Journal of Elasticity

, Volume 119, Issue 1–2, pp 293–320 | Cite as

Buckling of Naturally Curved Elastic Strips: The Ribbon Model Makes a Difference

  • Basile Audoly
  • Keith A. Seffen
Article

Abstract

We analyze the stability of naturally curved, inextensible elastic ribbons. In experiments, we first show that a loop formed using a metallic strip can become unstable if its radius is larger than its natural radius of curvature (undercurved case): the loop then folds onto itself into a smaller, multiply-covered loop. Conversely, a multi-covered, overcurved metallic strip can unfold dynamically into a circular configuration having a lower covering index. We analyze these instabilities using a one-dimensional mechanical model for an elastic ribbon introduced recently (Dias and Audoly in J. Elast., 2014), which extends Sadowsky’s developable elastic ribbon model in the presence of natural curvature. Combining linear stability analyses and numerical computations of the post-buckled configurations, we classify the equilibria of the ribbon as a function of the ratio of its natural curvature to its actual curvature. Our ribbon model is formulated in close analogy with classical rod models; this allows us to adapt classical stability methods for rods to the case of a ribbon. The stability of a ribbon is found to differ significantly from that of an anisotropic rod: we attribute this difference to the fact that the tangent twisting modulus of a ribbon can be negative, in contrast to what is possible in the well-studied case of linearly elastic rods. The specific stability properties predicted by the curved ribbon model are confirmed by a finite element analysis of cylindrical shells having a small height-to-radius ratio.

Keywords

Elastic plates Elastic rods Energy minimization 

Mathematics Subject Classification

74K20 74K10 74G65 

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.UMR 7190 Institut Jean Le Rond d’AlembertSorbonne Universités, UPMC Univ Paris 06, CNRSParisFrance
  2. 2.Department of EngineeringUniversity of CambridgeCambridgeUK

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