A Double-Strand Elastic Rod Theory |
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Authors: | Maher?Moakher Email author" target="_blank">John H?MaddocksEmail author |
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Institution: | (1) Laboratoire de Modélisation Mathématique et Numérique dans les Sciences de l’Ingénieur, Ecole Nationale d’Ingénieurs de Tunis, B.P. 37, 1002 Tunis, Tunisia;(2) Institut Mathématique B, Ecole Polytechnique, Fédérale de Lausanne, CH-1015 Lausanne, Switzerland |
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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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