Design and characterization of multi-stable mechanical metastructures with level and tilted stable configurations

Journal article (2020)

Authors

Y. Zhang Computational Design and Mechanics - Mechanical, Maritime and Materials Engineering
Q. Wang Computational Design and Mechanics - Mechanical, Maritime and Materials Engineering
M. Tichem Micro and Nano Engineering - Mechanical, Maritime and Materials Engineering
A. van Keulen Computational Design and Mechanics - Mechanical, Maritime and Materials Engineering
Research Group
Computational Design and Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2020 Y. Zhang, Q. Wang, M. Tichem, A. van Keulen
DOI: https://doi.org/10.1016/j.eml.2019.100593
Level stable configuration Metastructure Multi-stability Snap-through transition Tilted stable configuration
More Info
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Published Date

2020

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Precision and Microsystems Engineering

Research Group

Computational Design and Mechanics

Abstract

Multi-stable structures are able to achieve significant geometric change and retain specific deformed configurations after the loads have been removed. This reconfiguration property enables, for example, to design metamaterials with tunable features. In this work, a type of multi-stable metastructures exhibiting both level and tilted stable configurations is proposed based on 2D and 3D arrangements of bi-stable elements. The resulting level and tilted configurations are enabled by the rotational compliance, bi-stability and spatial arrangement of unit cells. The bi-stability of the unit cells and multi-stability of the metastructures are demonstrated and characterized by experiments and finite element analysis. Results show that transitions between level stable configurations are symmetric in terms of load–deflection response while switching to the tilted stable configurations leads to asymmetric mechanical responses. The tilted stable configurations are less stable than the level configurations. Moreover, we demonstrate that the level and tilted stable configurations of the metastructure depend on the parallel and serial arrangement of the unit cells.