Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 25, Pages 7639-7644Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1502939112
Keywords
isostatic lattices; topological modes; topological mechanics; tunable failure
Categories
Funding
- Foundation for Fundamental Research on Matter
- Delta Institute for Theoretical Physics, a program of The Netherlands Organization for Scientific Research
- Dutch Ministry of Education, Culture, and Science
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States of self-stress-tensions and compressions of structural elements that result in zero net forces-play an important role in determining the load-bearing ability of structures ranging from bridges to metamaterials with tunable mechanical properties. We exploit a class of recently introduced states of self-stress analogous to topological quantum states to sculpt localized buckling regions in the interior of periodic cellular metamaterials. Although the topological states of self-stress arise in the linear response of an idealized mechanical frame of harmonic springs connected by freely hinged joints, they leave a distinct signature in the nonlinear buckling behavior of a cellular material built out of elastic beams with rigid joints. The salient feature of these localized buckling regions is that they are indistinguishable from their surroundings as far as material parameters or connectivity of their constituent elements are concerned. Furthermore, they are robust against a wide range of structural perturbations. We demonstrate the effectiveness of this topological design through analytical and numerical calculations as well as buckling experiments performed on two-and three-dimensional metamaterials built out of stacked kagome lattices.
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