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Materials 2019, 12(1), 187;

Soft and Stiff Simplex Tensegrity Lattices as Extreme Smart Metamaterials

Faculty of Civil Engineering, Warsaw University of Technology, 00-637 Warsaw, Poland
Author to whom correspondence should be addressed.
Received: 9 November 2018 / Revised: 23 December 2018 / Accepted: 3 January 2019 / Published: 8 January 2019
(This article belongs to the Special Issue New Horizon of Plasmonics and Metamaterials)
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The present paper is dedicated to an evaluation of novel cellular metamaterials based on a tensegrity pattern. The materials are constructed from supercells, each of which consists of a number of simplex modules with different geometrical proportions. Mechanical properties of the metamaterial can be controlled by adjusting the level of self-equilibrated forces or by changing the properties of structural members. A continuum model based on the equivalence of strain energy of the 3D theory of elasticity with a discrete formulation is used to identify the qualitative properties of the considered metamaterials. The model allows the inclusion of nonlinearities related to the equations of equilibrium in actual configuration of the structure with self-equilibrated set of normal forces typical for tensegrities. The lattices are recognised as extreme metamaterials according to the eigensolution of the equivalent elasticity matrices of the continuum model. The six representative deformation modes are defined and discussed: stiff, soft and medium extensional modes and high (double) as well as low shear modes. The lattices are identified as unimode or nearly bimode according to the classification of extreme materials. View Full-Text
Keywords: metamaterial; tensegrity lattice; extreme material metamaterial; tensegrity lattice; extreme material

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Al Sabouni-Zawadzka, A.; Gilewski, W. Soft and Stiff Simplex Tensegrity Lattices as Extreme Smart Metamaterials. Materials 2019, 12, 187.

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