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A Double-Strand Elastic Rod Theory

Authors
  • Moakher, Maher1
  • Maddocks, John H.2
  • 1 Ecole Nationale d’Ingénieurs de Tunis, Laboratoire de Modélisation Mathématique et Numérique dans les Sciences de l’Ingénieur, Tunis, B.P. 37, 1002, Tunisia , Tunis
  • 2 Ecole Polytechnique, Institut Mathématique B, Fédérale de Lausanne, Lausanne, CH-1015, Switzerland , Lausanne
Type
Published Article
Journal
Archive for Rational Mechanics and Analysis
Publisher
Springer-Verlag
Publication Date
Apr 11, 2005
Volume
177
Issue
1
Pages
53–91
Identifiers
DOI: 10.1007/s00205-005-0360-y
Source
Springer Nature
Keywords
License
Yellow

Abstract

Motivated by applications in the modeling of deformations of the DNA double helix, we construct a continuum mechanics model of two elastically interacting elastic strands. The two strands are described in terms of averaged, or macroscopic, variables plus an additional small, internal or microscopic, perturbation. We call this composite structure a birod. The balance laws for the macroscopic configuration variables of the birod can be cast in the form of a classic Cosserat rod model with coupling to the internal balance laws through the constitutive relations. The internal balance laws for the microstructure variables also take a mathematical form analogous to that for a Cosserat rod, but with coupling to the macroscopic system through terms corresponding to distributed force and couple loads.

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