Mechanics of 2D Materials-Based Cellular Kirigami Structures: A Computational Study
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https://doi.org/10.1007/s11837-020-04429-5 Ó 2020 The Minerals, Metals & Materials Society
TECHNICAL ARTICLE
Mechanics of 2D Materials-Based Cellular Kirigami Structures: A Computational Study SHAOHENG LI,1 NING LIU,1 MATTHEW BECTON,1 NICHOLAS WINTER,1 RAMANA M. PIDAPARTI,1 and XIANQIAO WANG 1,2 1.—College of Engineering, 2.—e-mail: [email protected]
University
of
Georgia,
Athens,
GA
30605,
USA.
We develop a generic coarse-grained potential for a general group of 2D materials to study the mechanical performance of 2D materials-based cellular kirigami structures for understanding of the relation between the mechanical properties and structure pattern as well as the material component. By patterning the structure lattice cell, the mechanical properties of 2D materialsbased structures show a very wide range from almost zero to those of the pristine 2D materials by orders of magnitude. Moreover, results indicate that there are two distinct stress–strain stages associated with density, J-shape non-linear and linear elasticity. Results also indicate that hole-in structures show better ductility performance than no-hole structures. In addition, the material effect on mechanical performance of 2D materials-based cellular kirigami is significant, exemplified by the graphene-based structure outperforming those made of other 2D materials. Overall, this study provides a computational basis for designing future kirigami structures with outstanding properties and functions.
INTRODUCTION Due to the unique transformation characteristics such as twisting and rotation, 2D materials with reasonably designed 2D structures have shown a wealth of unique mechanical properties, such as tensile strength, toughness, and stiffness as well as the ability for shape reconfiguration.1 These extraordinary properties are usually governed by the structure.1 However, how the material composition influences the exceptional properties aforementioned is still an open question. Thus, it would be interesting to explore whether the component material with outstanding mechanical properties, such as 2D materials,2 can help improve the emerging extraordinary properties of architected 2D structures. In the previous studies, along with the prosperity of 2D materials, rationally designed 2D structures have attracted enormous interest for applications in flexible and stretchable electronics 3–5 , phononic devices,6 and structurally tunable
(Received June 1, 2020; accepted September 29, 2020)
optics.7 Despite the experimental achievements, the combined effects of cellular structure and component material on the mechanical performance of architected structures based on 2D materials have not been thoroughly understood. Therefore, in this article, the mechanical performance of 2D materialbased cellular kirigami structures will be investigated to establish such a link between nanoscale characteristics and macroscopic performance. Due to the principles of classical elasticity, it is anticipated that increasing cuts (i.e., removing atoms) will both weaken and
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