Handedness in shearing auxetics creates rigid and compliant structures

Science
Jeffrey Ian LiptonDaniela Rus

Abstract

In nature, repeated base units produce handed structures that selectively bond to make rigid or compliant materials. Auxetic tilings are scale-independent frameworks made from repeated unit cells that expand under tension. We discovered how to produce handedness in auxetic unit cells that shear as they expand by changing the symmetries and alignments of auxetic tilings. Using the symmetry and alignment rules that we developed, we made handed shearing auxetics that tile planes, cylinders, and spheres. By compositing the handed shearing auxetics in a manner inspired by keratin and collagen, we produce both compliant structures that expand while twisting and deployable structures that can rigidly lock. This work opens up new possibilities in designing chemical frameworks, medical devices like stents, robotic systems, and deployable engineering structures.

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Citations

May 11, 2019·Advanced Materials·Fei PanYuli Chen
Feb 23, 2019·Advanced Materials·I Fernandez-CorbatonM Wegener
Jan 2, 2020·Proceedings. Mathematical, Physical, and Engineering Sciences·Maximillian D X DixonIsaac V Chenchiah
Oct 31, 2019·Materials·Janet ReinboldMartin Wegener
Sep 12, 2019·Advanced Science·Yuri A MezenovValentin A Milichko
Feb 23, 2019·Materials·Christa P de JongeAmir A Zadpoor
Jul 31, 2019·Nature Communications·Tobias FrenzelMartin Wegener
Oct 7, 2020·Science Robotics·Hajun LeeJiyun Kim
Jun 5, 2020·Sensors·Parth Uday KelkarHyun-Cheol Song
Apr 23, 2021·Advanced Materials·Xiaojiang LiuZhongze Gu
Oct 4, 2019·ACS Applied Materials & Interfaces·Shuai WuRuike Zhao

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