globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1713826115
论文题名:
Localizing softness and stress along loops in 3D topological metamaterials
作者: Baardink G.; Souslov A.; Paulose J.; Vitelli V.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:3
起始页码: 489
结束页码: 494
语种: 英语
Scopus关键词: Article ; hardness ; material state ; mechanical stress ; metamaterial ; polarization ; priority journal ; rigidity
英文摘要: Topological states can be used to control the mechanical properties of a material along an edge or around a localized defect. The rigidity of elastic networks is characterized by a topological invariant called the polarization; materials with a well-defined uniform polarization display a dramatic range of edge softness depending on the orientation of the polarization relative to the terminating surface. However, in all 3D mechanical metamaterials proposed to date, the topological modes are mixed with bulk soft modes, which organize themselves in Weyl loops. Here, we report the design of a 3D topological metamaterial without Weyl lines and with a uniform polarization that leads to an asymmetry between the number of soft modes on opposing surfaces. We then use this construction to localize topological soft modes in interior regions of the material by including defect lines-dislocation loops-that are unique to three dimensions. We derive a general formula that relates the difference in the number of soft modes and states of self-stress localized along the dislocation loop to the handedness of the vector triad formed by the lattice polarization, Burgers vector, and dislocation-line direction. Our findings suggest a strategy for preprogramming failure and softness localized along lines in 3D, while avoiding extended soft Weyl modes. © 2018 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163749
Appears in Collections:气候变化与战略

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作者单位: Baardink, G., Instituut-Lorentz, Universiteit Leiden, Leiden, 2300 RA, Netherlands; Souslov, A., Instituut-Lorentz, Universiteit Leiden, Leiden, 2300 RA, Netherlands, James Franck Institute, University of Chicago, Chicago, IL 60637, United States, Department of Physics, University of Chicago, Chicago, IL 60637, United States; Paulose, J., Instituut-Lorentz, Universiteit Leiden, Leiden, 2300 RA, Netherlands, Department of Physics, University of California, Berkeley, CA 94720, United States, Department of Integrative Biology, University of California, Berkeley, CA 94720, United States; Vitelli, V., Instituut-Lorentz, Universiteit Leiden, Leiden, 2300 RA, Netherlands, James Franck Institute, University of Chicago, Chicago, IL 60637, United States, Department of Physics, University of Chicago, Chicago, IL 60637, United States

Recommended Citation:
Baardink G.,Souslov A.,Paulose J.,et al. Localizing softness and stress along loops in 3D topological metamaterials[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(3)
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