TY - JOUR
T1 - Action-at-a-distance metamaterials
T2 - Distributed local actuation through far-field global forces
AU - Hedayati, R.
AU - Mirzaali, M. J.
AU - Vergani, L.
AU - Zadpoor, A. A.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
UR - http://resolver.tudelft.nl/uuid:7fed94b0-8c7b-4b3d-a65a-637285cc3866
UR - http://www.scopus.com/inward/record.url?scp=85043279954&partnerID=8YFLogxK
U2 - 10.1063/1.5019782
DO - 10.1063/1.5019782
M3 - Article
AN - SCOPUS:85043279954
SN - 2166-532X
VL - 6
JO - APL Materials (online)
JF - APL Materials (online)
IS - 3
M1 - 036101
ER -