Scaling laws for non-Euclidean plates and the $W^{2,2}$ isometric immersions of Riemannian metrics

Details Scaling laws for non-Euclidean plates and the $W^{2,2}$ isometric immersions of Riemannian metrics Scaling laws for non-Euclidean plates and the $W^{2,2}$ isometric immersions of Riemannian metrics

2009-07-10

arxiv.org/abs/0907.1857v1

Physics

Mathematical Physics

18 pages, 1 figure

Scientific paper

This paper concerns the elastic structures which exhibit non-zero strain at free equilibria. Many growing tissues (leaves, flowers or marine invertebrates) attain complicated configurations during their free growth. Our study departs from the 3d incompatible elasticity theory, conjectured to explain the mechanism for the spontaneous formation of non-Euclidean metrics. Recall that a smooth Riemannian metric on a simply connected domain can be realized as the pull-back metric of an orientation preserving deformation if and only if the associated Riemann curvature tensor vanishes identically. When this condition fails, one seeks a deformation yielding the closest metric realization. We set up a variational formulation of this problem by introducing the non-Euclidean version of the nonlinear elasticity functional, and establish its $\Gamma$-convergence under the proper scaling. As a corollary, we obtain new necessary and sufficient conditions for existence of a $W^{2,2}$ isometric immersion of a given 2d metric into $\mathbb R^3$.

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