Journal
COMPOSITE STRUCTURES
Volume 202, Issue -, Pages 1275-1279Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2018.06.015
Keywords
Modular metamaterial; Auxetic behavior; Additive manufacturing; Customized assembly; Digital image correlation
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Funding
- Technology Agency of the Czech Republic [TACR TH02020420]
- Ministry of Industry and Trade of the Czech Republic [MPO FV10202]
- CTU grant [SGS18/037/OHK1/1T/11]
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A concept of a planar modular mechanical metamaterial inspired by the principle of local adaptivity is proposed. The metamaterial consists of identical pieces similar to jigsaw puzzle tiles. Their rotation within assembly provides a substantial flexibility in terms of structural behavior, whereas mechanical interlocks enable re-assembly. The tile design with a diagonal elliptical opening allows us to vary elastic properties from stiff to compliant, with positive, zero, or negative Poisson's ratio. The outcomes of experimental testing on additively manufactured specimens confirm that the assembly properties can be accurately designed using optimization approaches with finite element analysis at heart.
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