The two-dimensional elasticity of a chiral hinge lattice metamaterial. (1st June 2018)

• Record Type: Journal Article
• Authors: Zhang, Wenjiao; Neville, Robin; Zhang, Dayi; Scarpa, Fabrizio; Wang, Lifeng; Lakes, Roderic
• Is Part Of: International journal of solids and structures. Volume 141/142(2018)
• Page Start: 254
• Page End: 263
• Publication Date: 2018-06-01
• Subjects: Lattice -- Metamaterial -- Chiral -- Elasticity -- Tension -- Shear; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2018.02.027
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: We present a lattice structure defined by patterns of slits that follow a rotational symmetry (chiral) configuration. The chiral pattern of the slits creates a series of hinges that produce deformation mechanisms for the lattice due to bending of the ribs, leading to a marginal negative Poisson's ratio. The engineering constants are modeled using theoretical and numerical Finite Element simulations. The results are benchmarked with experimental data obtained from uniaxial and off-axis tensile tests, with an overall excellent agreement. The chiral hinge lattice is almost one order of magnitude more compliant than other configurations with patterned slits and – in contrast to other chiral micropolar media – exhibits an in-plane shear modulus that closely obeys the relation between Young's modulus and Poisson's ratio in homogeneous isotropic linear elastic materials.