An emerging class of hyperbolic lattice exhibiting tunable elastic properties and impact absorption through chiral twisting. (October 2020)

• Record Type: Journal Article
• Authors: Meng, Liang; Shi, Jianxiong; Yang, Chen; Gao, Tong; Hou, Yuliang; Song, Longlong; Gu, Dongdong; Zhu, Jihong; Breitkopf, Piotr; Zhang, Weihong
• Is Part Of: Extreme mechanics letters. Volume 40(2020)
• Publication Date: 2020-10
• Subjects: Hyperbolic lattice -- Architected material -- Mechanical property -- Chiral twisting; Mechanics -- Periodicals; Mechanics, Applied -- Periodicals; Mechanics; Electronic journals; Periodicals; 531.05
• DOI: 10.1016/j.eml.2020.100869
• Languages: English
• ISSNs: 2352-4316

Abstract

Abstract: 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.