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DOI | 10.1007/s00382-016-3121-8 |
Mechanical metamaterials at the theoretical limit of isotropic elastic stiffness | |
Berger, J. B.1,2; Wadley, H. N. G.3; Mcmeeking, R. M.1,2,4,5 | |
2017-03-23 | |
发表期刊 | NATURE |
ISSN | 0028-0836 |
EISSN | 1476-4687 |
出版年 | 2017 |
卷号 | 543期号:7646页码:533-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Scotland; Germany |
英文摘要 | A wide variety of high-performance applications(1) require materials for which shape control is maintained under substantial stress, and that have minimal density. Bio-inspired hexagonal and square honeycomb structures and lattice materials based on repeating unit cells composed of webs or trusses(2), when made from materials of high elastic stiffness and low density(3), represent some of the lightest, stiffest and strongest materials available today(4). Recent advances in 3D printing and automated assembly have enabled such complicated material geometries to be fabricated at low (and declining) cost. These mechanical metamaterials have properties that are a function of their mesoscale geometry as well as their constituents(3,5-12), leading to combinations of properties that are unobtainable in solid materials; however, a material geometry that achieves the theoretical upper bounds for isotropic elasticity and strain energy storage (the Hashin-Shtrikman upper bounds) has yet to be identified. Here we evaluate the manner in which strain energy distributes under load in a representative selection of material geometries, to identify the morphological features associated with high elastic performance. Using finite-element models, supported by analytical methods, and a heuristic optimization scheme, we identify a material geometry that achieves the Hashin-Shtrikman upper bounds on isotropic elastic stiffness. Previous work has focused on truss networks and anisotropic honeycombs, neither of which can achieve this theoretical limit(13). We find that stiff but well distributed networks of plates are required to transfer loads efficiently between neighbouring members. The resulting low-density mechanical metamaterials have many advantageous properties: their mesoscale geometry can facilitate large crushing strains with high energy absorption(2,14,15), optical bandgaps(16-19) and mechanically tunable acoustic bandgaps(20), high thermal insulation(21), buoyancy, and fluid storage and transport. Our relatively simple design can be manufactured using origami-like sheet folding(22) and bonding methods. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000397018000047 |
WOS关键词 | STRENGTH ; BEHAVIOR ; DESIGN |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36260 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif, Dept Mat, Santa Barbara, CA 93106 USA; 2.Univ Calif, Dept Mech Engn, Santa Barbara, CA 93106 USA; 3.Univ Virginia, Sch Engn & Appl Sci, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA; 4.Univ Aberdeen, Kings Coll, Sch Engn, Aberdeen AB24 3UE, Scotland; 5.INM Leibniz Inst New Mat, Campus D22, D-66123 Saarbrucken, Germany |
推荐引用方式 GB/T 7714 | Berger, J. B.,Wadley, H. N. G.,Mcmeeking, R. M.. Mechanical metamaterials at the theoretical limit of isotropic elastic stiffness[J]. NATURE,2017,543(7646):533-+. |
APA | Berger, J. B.,Wadley, H. N. G.,&Mcmeeking, R. M..(2017).Mechanical metamaterials at the theoretical limit of isotropic elastic stiffness.NATURE,543(7646),533-+. |
MLA | Berger, J. B.,et al."Mechanical metamaterials at the theoretical limit of isotropic elastic stiffness".NATURE 543.7646(2017):533-+. |
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