Design of cut unit geometry in hierarchical kirigami-based auxetic metamaterials for high stretchability and compressibility
By Yichao Tang, Jie Yin. 2017
252 citations recorded by the source corpus.
Abstract We studied the mechanical response of a recently developed new class of mechanical metamaterials based on the paper art of cutting, kirigami. Specially, the geometrical and structural design of representative cut units, via combined line cut, cut-out, and hierarchy of the structure, was explored for achieving both extreme stretchability and/or compressibility in kirigami metamaterials through experiments, alongside geometrical modeling and finite element simulations. The kirigami design was tested on constituent materials including non-stretchable copy papers and highly stretchable silicone rubber to explore the role of constituent material properties. The cut unit in the shape of solid rectangles with the square shape as a special case was demonstrated for achieving the extreme stretchability via rigid rotation of cut units. We found that compared to the square cut units, the theoretically predicted maximum stretchability via unit rotation in rectangle units (aspect ratio 2:1) increased dramatically from about 41% to 124% for the level 1 cut structure without hierarchy, and from about 62% to 156% for the level 2 hierarchical cut structure, which was validated by both experiments and simulations. To demonstrate the achievement of both extreme stretchability and compressibility, we replaced the solid square cut units with porous squares and re-entrant lattice shapes in silicone rubber based metamaterials. We found that a porous structure can enable an extreme compressibility of as high as 81%.
Subfields: Mechanical Engineering, Polymers and Plastics
View Paper: https://www.semanticscholar.org/paper/546441fa23b6f73f6bd2bf4b973fcd8509d4ffcf
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In Mechanical Engineering
In Polymers and Plastics
Citations in the corpus
- Auxetic mechanical metamaterials (2017, unknown): “Auxetic materials have thus far been applied in many novel applications including so robotics, 133 biomedicine, 32 so electronics, 134 and acoustics.”
- Auxetic metamaterials and structures: a review (2018, background): “Demonstration of high stretchability and compressibility: (a) 2d auxetic materials with the unit cell of circle as void; (b) 2d auxetic materials with the unit cell of modified re-entrant structure [127].”