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Snap-through inversion of elastic shells swelling via solvent diffusion.
Ji-Sung Park1, Junseong Kim1, Anna Lee2
1Department of Mechanical Engineering, Seoul National University, Seoul 08826, Korea. hyk@snu.ac.kr.
Soft Matter
|October 20, 2023
Summary
Differential swelling in bilayer shells triggers snap-through buckling. Non-axisymmetric buckling releases more energy than axisymmetric buckling, offering insights into elastic shell actuation.
Area of Science:
- Mechanics of Materials
- Soft Matter Physics
- Biomechanical Engineering
Background:
- Elastic shells exhibit snap-through buckling, a phenomenon crucial for actuation in biological and artificial systems.
- Previous studies focused on shallow shells, primarily exhibiting axisymmetric inversion modes.
Purpose of the Study:
- Investigate diffusion-swelling induced snap-through inversion in bilayer shells across various depths.
- Explore both axisymmetric and non-axisymmetric buckling modes.
- Compare energy release mechanisms between different buckling modes.
Main Methods:
- Developed an analytical model for strain energy in axisymmetrically swelling shells.
- Utilized experiments and numerical simulations to analyze snap-through conditions.
- Compared critical conditions for axisymmetric versus non-axisymmetric inversion.
Main Results:
- Strain energy analysis accurately predicts snap-through conditions.
- Differentially swelling bilayer shells exhibit both axisymmetric and non-axisymmetric snap-through.
- Non-axisymmetric buckling leads to a time-lagged but increased energy release during inversion compared to axisymmetric buckling.
Conclusions:
- Snap-through instability in bilayer shells is tunable by shell depth and buckling mode.
- Non-axisymmetric buckling offers a more potent energy release mechanism for elastic shell actuation.
- Findings advance the understanding of mechanical instabilities in soft matter for engineered applications.
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