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Bifurcation of elastic curves with modulated stiffness

Abstract : We investigate the equilibrium configurations of closed planar elastic curves of fixed length, whose stiffness, also known as the bending rigidity, depends on an additional density variable. The underlying variational model relies on the minimization of a bending energy with respect to shape and density and can be considered as a one-dimensional analogue of the Canham-Helfrich model for heterogeneous biological membranes. We present a generalized Euler-Bernoulli elastica functional featuring a density-dependent stiffness coefficient. In order to treat the inherent nonconvexity of the problem we introduce an additional length scale in the model by means of a density gradient term. We derive the system of Euler-Lagrange equations and study the bifurcation structure of solutions with respect to the model parameters. Both analytical and numerical results are presented.
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Preprints, Working Papers, ...
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Contributor : Gaspard Jankowiak Connect in order to contact the contributor
Submitted on : Wednesday, October 13, 2021 - 11:36:30 AM
Last modification on : Saturday, October 16, 2021 - 3:10:25 AM


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  • HAL Id : hal-03025931, version 3



Katharina Brazda, Gaspard Jankowiak, Christian Schmeiser, Ulisse Stefanelli. Bifurcation of elastic curves with modulated stiffness. 2021. ⟨hal-03025931v3⟩



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