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Plastic Behavior01:21

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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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
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Summary
This summary is machine-generated.

Differential swelling in bilayer shells triggers snap-through buckling. Non-axisymmetric buckling releases more energy than axisymmetric buckling, offering insights into elastic shell actuation.

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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.