A generic design motif for metamaterials with controllable nonlinearity & guided deformation

Xiaofeng Geng, Zhipeng Zhao, Yingqing Guo, Jiqiang Wang, Hu Ding, Xingjian Jing*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Citations (Scopus)

Abstract

Structure design motifs take an essential role in creating materials or metamaterials with superior mechanics or special functions. However, a fundamental question naturally arising and remaining unknown is related to how to effectively design an engineered material structure with “adjustable and predictable” nonlinear mechanic properties conveniently. Here we propose a very simple but versatile design motif, named as bq-structure, which can provide superior flexibility in achieving various nonlinear properties, including 200 % larger and designable ranges of quasi-zero stiffness, negative stiffness, and multi-stable stiffness, etc, that original material or traditional beam-based design motifs cannot provide. The proposed design motif has sufficient reliability in nonlinear manipulation with a “guided & controllable” manner instead of “trail-and-error attempts” existing in most existing ones. A prototyped vibration isolation unit can achieve a resonant frequency less than 1 Hz easily which cannot be done with many other methods of similar size and payload. Given the large elastic deforming capacity and ductility in structural scale, the superb nonlinearity regime is generally designable with various structure parameters, uniquely providing a superior optimization tool with this novel design motif considering various real application requirements for advanced materials design, energy storage or conversion, mechanical vibration mitigation, and robotic systems etc. © 2024 Elsevier Ltd.
Original languageEnglish
Article number118125
JournalComposite Structures
Volume338
Online published14 Apr 2024
DOIs
Publication statusPublished - 15 Jun 2024

Funding

The authors gratefully acknowledge the support of the startup fund for Laboratory of Nonlinear Dynamics, Vibration, & Control, Department of Mechanical Engineering, City University of Hong Kong (Ref No. 9380140), a NSFC/RGC joint research scheme fund (N_CityU114/23), CityU strategic research fund (7005925), CityU Applied Research Grant (9667258), and National Natural Science Foundation of China (Grant No. 12202143).

Research Keywords

  • bq-structure
  • Design motif
  • Guided nonlinearity
  • High-intensity energy storage

Publisher's Copyright Statement

  • COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: © 2024 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/.

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