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Geometrical‐frustration‐induced anisotropy and inhomogeneity are explored to achieve unique properties of metamaterials that set them apart from conventional materials. According to Neumann's principle, to achieve anisotropic responses, the material unit cell should possess less symmetry. Based on such guidelines, a triclinic metamaterial system of minimal symmetry is presented, which originates from...
Origami Metamaterials
In article number 2107998, Glaucio H. Paulino and co‐workers create a class of metamaterials derived from a reconfigurable origami pattern with triclinic symmetry, leading to reversible auxeticity. When the tristable unit cells are tessellated, phenomena that resemble linear and point defects emerge as a result of geometric frustration, which can be reprogrammed at desired locations...
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