research


heterogeneously architected structures; lattice structures; deterministic assembly; elastic properties; interface


Weizhu Yang, Qingchang Liu, Zongzhan Gao, Zhufeng Yue, and Baoxing Xu
http://www.pnas.org/content/early/2018/07/11/1806769115
Play with your matchsticks for assembling extremely soft or hard 2D structures.
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Abstract:
Architected 2D structures are of growing interest due to their*unique mechanical and physical properties for applications in*stretchable electronics, controllable phononic/photonic modulators,*and switchable optical/electrical devices; however, the underpinning*theory of understanding their elastic properties and*enabling principles in search of emerging structures with welldefined*arrangements and/or bonding connections of assembled*elements has yet to be established. Here, we present two*theoretical frameworks in mechanics—strain energy-based theory*and displacement continuity-based theory—to predict the elastic*properties of 2D structures and demonstrate their application in a*search for novel architected 2D structures that are composed of*heterogeneously arranged, arbitrarily shaped lattice cell structures*with regulatory adjacent bonding connections of cells, referred to*as heterogeneously architected 2D structures (HASs). By patterning*lattice cell structures and tailoring their connections, the elastic*properties of HASs can span a very broad range from nearly zero*to beyond those of individual lattice cells by orders of magnitude.*Interface indices that represent both the pattern arrangements of*basic lattice cells and local bonding disconnections in HASs are also*proposed and incorporated to intelligently design HASs with ondemand*Young’s modulus and geometric features. This study offers*a theoretical foundation toward future architected structures*by design with unprecedented properties and functions.
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