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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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3D Auxetic Metamaterials with Elastically-Stable Continuous Phase Transition
Lianchao Wang1,2, Gwenn Ulliac2, Bing Wang1
1National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 18, 2022
Summary
This study introduces a novel 3D mechanical metamaterial with a tunable Poisson's ratio, transitioning from positive to negative under compression while maintaining elastic stability. This design overcomes limitations in current mechanical metamaterials.
Area of Science:
- Solid State Physics
- Materials Science
- Mechanical Engineering
Background:
- Phase transitions in solid-state physics alter material properties.
- Mechanical metamaterials utilize structural instability for phase transitions.
- Existing metamaterials often suffer property degradation during transitions.
Purpose of the Study:
- To design a 3D mechanical metamaterial with a tunable Poisson's ratio.
- To achieve a phase transition from positive to negative Poisson's ratio under compression.
- To maintain elastic stability and Young's modulus during the phase transition.
Main Methods:
- Design of a novel 3D mechanical metamaterial architecture.
- Fabrication using micro-scale two-photon lithography.
- Experimental assessment of mechanical behavior under compression.
Main Results:
- Demonstrated a phase transition from positive to negative Poisson's ratio.
- Observed minimal degradation of Young's modulus during the transition.
- Showcased sustained auxetic behavior over a range of compressive strain for specific parameters.
Conclusions:
- The novel 3D metamaterial successfully achieves a stable, tunable Poisson's ratio transition.
- This design overcomes limitations of property degradation in existing mechanical metamaterials.
- The metamaterial class offers potential for advanced applications requiring controlled mechanical responses.
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