Journal
EXTREME MECHANICS LETTERS
Volume 40, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.eml.2020.100869
Keywords
Hyperbolic lattice; Architected material; Mechanical property; Chiral twisting
Funding
- National Key Research and Development Program of China [2017YFB1102800]
- National Natural Science Foundation of China [11672239, 11902251, 51735005, 11620101002]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JQ-115]
- Fundamental Research Funds for the Central Universities, China [G2018KY0304]
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Lightweight lattice structures and chiral metamaterials have both received extensive attention during the past decades. This work builds up a systematic design procedure for an emerging class of architected materials, achieving chirality and achirality under the same framework of parameterization. The design of the so-called 'hyperbolic unit cell' takes inspiration ultimately from the double-layered morphology of the fore-wing shells of flying beetles, being intended to replicate the hyperbolic geometric feature. The tessellation schemes that populate the microstructure to a component level are stirred up by the similarity with Euclidean tiling of convex regular polygons. Numerical and experimental studies revealed a wide variation of elastic constants for hyperbolic materials maintaining the same volume fraction, making more visible their applications under various loading scenarios, including compression, tension and shear. Also, a significant twisting effect, observed on the chiral cellular material, is shown to be advantageous in the design of buffering plates and energy-absorbing devices. (C) 2020 Elsevier Ltd. All rights reserved.
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