Chiral three-dimensional isotropic lattices with negative Poisson’s ratio
نویسندگان
چکیده
Chiral three-dimensional isotropic cubic lattices with rigid cubical nodules and multiple deformable ribs are developed and analyzed via finite element analysis. The lattices exhibit geometry dependent Poisson’s ratio that can be tuned to negative values. Poisson’s ratio decreases from positive to negative values as the number of cells increases. Isotropy is obtained by adjustment of aspect ratio. The lattices exhibit significant size e↵ects. Such a phenomenon cannot occur in a classical elastic continuum but it can occur in a Cosserat solid. Preprint adapted from Ha, C. S., Plesha, M. E., Lakes, R. S., ”Chiral three-dimensional isotropic lattices with negative Poisson’s ratio”, Physica Status Solidi B, 253, (7), 1243-1251 (2016).
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Chiral three-dimensional lattices with tunable Poisson’s ratio
Chiral three-dimensional cubic lattices are developed with rigid cubical nodules and analyzed via finite element analysis. The lattices exhibit geometry dependent Poisson’s ratio that can be tuned to negative values. Poisson’s ratio tends to zero as the cubes become further apart. The lattices exhibit stretch-twist coupling. Such coupling cannot occur in a classical elastic continuum but it can...
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