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- W2216492007 abstract "The engineered class of anti-tetrachiral cellular materials is phenomenologically characterized by a strong auxeticity of the elastic macroscopic response. The auxetic behavior, accompanied by a marked anisotropy, is activated by rolling-up deformation mechanisms developed by the periodic pattern of stiff rings and flexible ligaments realizing the material micro-structure. In the absence of a soft matrix, a linear beam lattice model is formulated to describe the free dynamic response of the periodic cell. After a static condensation of the passive degrees-of-freedom, a general procedure is applied to impose the quasi-periodicity conditions of free wave propagation in the low-dimension space of the active degrees-of-freedom. The effects of different mechanical parameters on the band structure are analyzed by comparing the exact dispersion curves with explicit, although approximate, dispersion functions, obtained from asymptotic perturbation solutions of the eigenproblem rising up from the Floquet-Bloch theory. A general scheme for the formulation and solution of the perturbation equations is outlined, for the desired approximation order and depending on the dimension of the perturbation vector. A satisfying approximation accuracy is achieved for low-order asymptotic solutions in wide regions of the parameter space. The explicit dependence of the dispersion functions on the main parameters, including the cell aspect ratio, the ligament slenderness and the ring density, allows the in-depth discussion and - in a design perspective - the fine assessment of the spectrum properties, including specific features like wave velocities and band gap amplitudes." @default.
- W2216492007 created "2016-06-24" @default.
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- W2216492007 creator A5033482554 @default.
- W2216492007 date "2015-12-24" @default.
- W2216492007 modified "2023-10-01" @default.
- W2216492007 title "High-frequency parametric approximation of the Floquet-Bloch spectrum for anti-tetrachiral materials" @default.
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