Periodic rhomboidal cells for symmetry-preserving homogenization and isotropic metamaterials. (November 2022)

• Record Type: Journal Article
• Authors: Giusteri, Giulio G.; Penta, Raimondo
• Is Part Of: Mechanics research communications. Volume 126(2022)
• Publication Date: 2022-11
• Subjects: Material symmetry -- Periodic composite -- Homogenization -- Isotropic metamaterial; Mechanics, Applied -- Periodicals; Mécanique appliquée -- Périodiques; Mechanics, Applied; Periodicals; 530
• DOI: 10.1016/j.mechrescom.2022.104001
• Languages: English
• ISSNs: 0093-6413

Abstract

Abstract: In the design and analysis of composite materials based on periodic arrangements of sub-units it is of paramount importance to control the emergent material symmetry in relation to the elastic response. The target material symmetry plays also an important role in additive manufacturing. In numerous applications it would be useful to obtain effectively isotropic materials. While these typically emerge from a random microstructure, it is not obvious how to achieve isotropy with a periodic order. We prove that arrangements of inclusions based on a rhomboidal cell that generates the face-centered cubic lattice do in fact preserve any material symmetry of the constituents, so that spherical inclusions of isotropic materials in an isotropic matrix produce effectively isotropic composites. Highlights: A three-dimensional isotropic composite is generated by a periodic microstructure. Rhomboidal periodic cell that does not restrict the material symmetry of composites. Symmetry arguments simplified by a frame-independent Voigt representation.