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- W2953047464 abstract "A two-dimensional bistable lattice is a periodic triangular network of non-linear bi-stable rods. The energy of each rod is piecewise quadratic and has two minima. Consequently, a rod undergoes a reversible phase transition when its elongation reaches a critical value. We study an energy minimization problem for such lattices. The objective is to characterize the effective energy of the system when the number of nodes in the network approaches infinity. The most important feature of the effective energy is its bottom. This means that the effective energy density is zero for all strains inside a certain three-dimensional set in the strain space. The flat occurs because the microscopic discrete model has a large number of deformed states that carry no forces. We call such deformations still states. In the paper, we present a complete characterization of the bottom set in terms of the parameters of the network. This is done by constructing a family of still states whose average strains densely fill the set in question. The two-dimensional case is more difficult than the previously studied case of one-dimensional chains, because the elongations in two-dimensional networks must satisfy certain compatibility conditions that do not arise in the one-dimensional case. We derive these conditions for small and arbitrary deformations. For small deformations a complete analysis is provided." @default.
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- W2953047464 date "2008-09-23" @default.
- W2953047464 modified "2023-09-27" @default.
- W2953047464 title "Still states of bistable lattices, compatibility, and phase transition" @default.
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