Print Email Facebook Twitter Action-at-a-distance metamaterials Title Action-at-a-distance metamaterials: Distributed local actuation through far-field global forces Author Hedayati, R. (TU Delft Biomaterials & Tissue Biomechanics; Politecnico di Milano) Mirzaali, Mohammad J. (TU Delft Biomaterials & Tissue Biomechanics; Polytecnico di Milano) Vergani, L. (Politecnico di Milano) Zadpoor, A.A. (TU Delft Biomaterials & Tissue Biomechanics) Date 2018 Abstract Mechanical metamaterials are a sub-category of designer materials where the geometry of the material at the small-scale is rationally designed to give rise to unusual properties and functionalities. Here, we propose the concept of "action-at-a-distance" metamaterials where a specific pattern of local deformation is programmed into the fabric of (cellular) materials. The desired pattern of local actuation could then be achieved simply through the application of one single global and far-field force. We proposed graded designs of auxetic and conventional unit cells with changing Poisson's ratios as a way of making "action-at-a-distance" metamaterials. We explored five types of graded designs including linear, two types of radial gradients, checkered, and striped. Specimens were fabricated with indirect additive manufacturing and tested under compression, tension, and shear. Full-field strain maps measured with digital image correlation confirmed different patterns of local actuation under similar far-field strains. These materials have potential applications in soft (wearable) robotics and exosuits. To reference this document use: http://resolver.tudelft.nl/uuid:7fed94b0-8c7b-4b3d-a65a-637285cc3866 DOI https://doi.org/10.1063/1.5019782 ISSN 2166-532X Source APL Materials (online), 6 (3) Part of collection Institutional Repository Document type journal article Rights © 2018 R. Hedayati, Mohammad J. Mirzaali, L. Vergani, A.A. Zadpoor Files PDF 1.5019782.pdf 5.59 MB Close viewer /islandora/object/uuid:7fed94b0-8c7b-4b3d-a65a-637285cc3866/datastream/OBJ/view