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Instability-Induced Pattern Transformation in Soft Metamaterial with Hexagonal Networks for Tunable Wave Propagation
Chao Gao1, Viacheslav Slesarenko2, Mary C Boyce3
1Department of Mechanical Engineering, University of New Hampshire, Durham, NH, USA.
Scientific Reports
|August 9, 2018
Summary
Soft metamaterials exhibit two instability patterns under biaxial compression, altering their structure and wave propagation. This discovery enables smart materials with tunable functionalities via deformation.
Area of Science:
- Materials Science
- Mechanical Engineering
- Solid Mechanics
Background:
- Soft metamaterials offer tunable properties through structural design.
- Understanding instability phenomena is crucial for predicting material behavior under load.
Purpose of the Study:
- To investigate instability-induced pattern transformations in architectured multi-phase soft metamaterials under biaxial compression.
- To analyze the impact of these transformations on elastic wave propagation.
Main Methods:
- Theoretical derivation of critical strain and pattern transition criteria.
- Analysis of micro- and macro-instabilities under equi-biaxial loading.
- Elastic wave propagation analysis for different pattern types.
Main Results:
- Equi-biaxial compression induces two distinct instability patterns (Type I: wall wrinkling; Type II: periodicity switching).
- Pattern transformation significantly alters elastic wave propagation, affecting band gaps.
- A theoretical criterion for pattern transition was established based on architecture and material properties.
Conclusions:
- The study reveals distinct mechanical behaviors and rich properties of multi-phase soft metamaterials.
- These findings pave the way for designing novel smart materials with deformation-controlled switchable functionalities.
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