Sequential metamaterials with alternating Poisson’s ratios
Author(s)
Farzaneh, Amin; Pawar, Nikhil; Portela, Carlos M.; Hopkins, Jonathan B.
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Mechanical metamaterials have been designed to achieve custom Poisson’s ratios via the deformation of their microarchitecture. These designs, however, have yet to achieve the capability of exhibiting Poisson’s ratios that alternate by design both temporally and spatially according to deformation. This capability would enable dynamic shape-morphing applications including smart materials that process mechanical information according to multiple time-ordered output signals without requiring active control or power. Herein, both periodic and graded metamaterials are introduced that leverage principles of differential stiffness and self-contact to passively achieve sequential deformations, which manifest as user-specified alternating Poisson’s ratios. An analytical approach is provided with a complementary software tool that enables the design of such materials in two- and three-dimensions. This advance in design capability is due to the fact that the tool computes sequential deformations more than an order of magnitude faster than contemporary finite-element packages. Experiments on macro- and micro-scale designs validate their predicted alternating Poisson’s ratios.
Date issued
2022-02-24Department
Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Farzaneh, A., Pawar, N., Portela, C.M. et al. Sequential metamaterials with alternating Poisson’s ratios. Nat Commun 13, 1041 (2022).
Version: Final published version
ISSN
2041-1723
Keywords
General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry, Multidisciplinary