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The two-dimensional elasticity of a chiral hinge lattice metamaterial

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)254-263
Number of pages10
JournalInternational Journal of Solids and Structures
Volume141-142
Early online date23 Feb 2018
DOIs
DateAccepted/In press - 19 Feb 2018
DateE-pub ahead of print - 23 Feb 2018
DatePublished (current) - 1 Jun 2018

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 modelled 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.

    Research areas

  • Chiral, Elasticity, Lattice, Metamaterial, Shear, Tension

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