International Journal of Extreme Manufacturing, Volume. 5, Issue 4, 42003(2023)

Auxetic mechanical metamaterials: from soft to stiff

[in Chinese]1,*... [in Chinese]1, [in Chinese]2, [in Chinese]3, and [in Chinese]4,5,67 |Show fewer author(s)
Author Affiliations
  • 1School of Sciences, Nanjing University of Science and Technology, Nanjing 210094, People’s Republic of China
  • 2School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
  • 3Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
  • 4Nano-Manufacturing Laboratory (NML), CityU-Xidian Joint Laboratory of Micro/Nano-Manufacturing, Shenzhen Research Institute City University of Hong Kong, Shenzhen 518057, People’s Republic of China
  • 5Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region of China, People’s Republic of China
  • 6Chengdu Research Institute, City University of Hong Kong, Chengdu 610200, People’s Republic of China
  • 7Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region of China, People’s Republic of China
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    Auxetic mechanical metamaterials are artificially architected materials that possess negative Poisson’s ratio, demonstrating transversal contracting deformation under external vertical compression loading. Their physical properties are mainly determined by spatial topological configurations. Traditionally, classical auxetic mechanical metamaterials exhibit relatively lower mechanical stiffness, compared to classic stretching dominated architectures. Nevertheless, in recent years, several novel auxetic mechanical metamaterials with high stiffness have been designed and proposed for energy absorption, load-bearing, and thermal-mechanical coupling applications. In this paper, mechanical design methods for designing auxetic structures with soft and stiff mechanical behavior are summarized and classified. For soft auxetic mechanical metamaterials, classic methods, such as using soft basic material, hierarchical design, tensile braided design, and curved ribs, are proposed. In comparison, for stiff auxetic mechanical metamaterials, design schemes, such as hard base material, hierarchical design, composite design, and adding additional load-bearing ribs, are proposed. Multi-functional applications of soft and stiff auxetic mechanical metamaterials are then reviewed. We hope this study could provide some guidelines for designing programmed auxetics with specified mechanical stiffness and deformation abilities according to demand.

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    [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Auxetic mechanical metamaterials: from soft to stiff[J]. International Journal of Extreme Manufacturing, 2023, 5(4): 42003

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    Paper Information

    Category: Topical Review

    Received: Oct. 22, 2022

    Accepted: --

    Published Online: Jul. 24, 2024

    The Author Email: (lixiang9@njust.edu.cn)

    DOI:10.1088/2631-7990/ace668

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