Journal of Elasticity

, Volume 68, Issue 1–3, pp 95–121 | Cite as

Classification of the Spatial Equilibria of the Clamped Elastica: Symmetries and Zoology of Solutions

  • Sébastien Neukirch
  • Michael E. Henderson


We investigate the configurations of twisted elastic rods under applied end loads and clamped boundary conditions. We classify all the possible equilibrium states of inextensible, unshearable, isotropic, uniform and naturally straight and prismatic rods. We show that all solutions of the clamped boundary value problem exhibit a π-flip symmetry. The Kirchhoff equations which describe the equilibria of these rods are integrated in a formal way which enable us to describe the boundary conditions in terms of 2 closed form equations involving 4 free parameters. We show that the flip symmetry property is equivalent to a reversibility property of the solutions of the Kirchhoff differential equations. We sort these solutions according to their period in the phase plane. We show how planar untwisted configurations as well as circularly closed configurations play an important role in the classification.

classification of boundary value problem solutions for elastic rods 


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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Sébastien Neukirch
    • 1
  • Michael E. Henderson
    • 2
  1. 1.Bernoulli Institute, School of Basic Sciences, École Polytechnique Fédérale de LausanneLausanneSwitzerland
  2. 2.T.J. Watson Research Center I.B.M.Yorktown HeightsU.S.A.

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