3D cellular metamaterials with planar anti-chiral topology

Publication date: 5 May 2018
Source:Materials & Design, Volume 145
Author(s): Hamid Ebrahimi, Davood Mousanezhad, Hamid Nayeb-Hashemi, Julian Norato, Ashkan Vaziri
We constructed a new class of three-dimensional cellular metamaterials by connecting planar structure with anti-chiral topology. This was achieved by introducing a unique node design for connecting planar materials to enable constructing a three-dimensional architecture. This node design is based on linking the circular elements of the anti-chiral topology using oblique load-bearing ligaments. As the planar structure is subjected to loading, the circular elements rotate and the ligaments undergo bending, resulting in out-of-plane deformation of the three-dimensional cellular metamaterials. The node design, and specifically the ligaments' revolution angle govern the behavior of cellular metamaterials. This was demonstrated by designing cellular metamaterials with a wide range of positive and negative Poisson's ratio in the out-of-plane direction.

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