气候变化领域集成服务门户(CCPortal): Elastic-instability

CCPortal

DOI	10.1073/pnas.2013801118
	Elastic-instability–enabled locomotion
	Nagarkar A.; Lee W.-K.; Preston D.J.; Nemitz M.P.; Deng N.-N.; Whitesides G.M.; Mahadevan L.
发表日期	2021
ISSN	00278424
卷号	118 期号:8
英文摘要	Locomotion of an organism interacting with an environment is the consequence of a symmetry-breaking action in space-time. Here we show a minimal instantiation of this principle using a thin circular sheet, actuated symmetrically by a pneumatic source, using pressure to change shape nonlinearly via a spontaneous buckling instability. This leads to a polarized, bilaterally symmetric cone that can walk on land and swim in water. In either mode of locomotion, the emergence of shape asymmetry in the sheet leads to an asymmetric interaction with the environment that generates movement––via anisotropic friction on land, and via directed inertial forces in water. Scaling laws for the speed of the sheet of the actuator as a function of its size, shape, and the frequency of actuation are consistent with our observations. The presence of easily controllable reversible modes of buckling deformation further allows for a change in the direction of locomotion in open arenas and the ability to squeeze through confined environments––both of which we demonstrate using simple experiments. Our simple approach of harnessing elastic instabilities in soft structures to drive locomotion enables the design of novel shape-changing robots and other bioinspired machines at multiple scales. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Buckling; Elastic instability; Locomotion
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180546
作者单位	Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States; Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, United States; Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, MA 02138, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; Department of Physics, Harvard University, Cambridge, MA 02138, United States; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, United States
推荐引用方式 GB/T 7714	Nagarkar A.,Lee W.-K.,Preston D.J.,等. Elastic-instability–enabled locomotion[J],2021,118(8).
APA	Nagarkar A..,Lee W.-K..,Preston D.J..,Nemitz M.P..,Deng N.-N..,...&Mahadevan L..(2021).Elastic-instability–enabled locomotion.Proceedings of the National Academy of Sciences of the United States of America,118(8).
MLA	Nagarkar A.,et al."Elastic-instability–enabled locomotion".Proceedings of the National Academy of Sciences of the United States of America 118.8(2021).