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Rucks and folds: delamination from a flat rigid substrate under uniaxial compression
Benny Davidovitch1, Vincent Démery2,3
1Department of Physics, University of Massachusetts Amherst, Amherst, MA, 01003, USA.
The European Physical Journal. E, Soft Matter
|March 8, 2021
Summary
Delamination of adhesive sheets under compression is governed by confinement, extensibility, and bendability. The study reveals two distinct delamination shapes,
Area of Science:
- Solid mechanics
- Materials science
- Adhesion science
Background:
- Adhesive sheet delamination under compression is a complex phenomenon.
- Understanding the governing parameters is crucial for material design and failure analysis.
Purpose of the Study:
- To analyze the delamination of solid adhesive sheets under uniaxial compression.
- To identify key dimensionless groups governing the delamination process.
- To characterize the different delamination shapes and their dependence on material properties.
Main Methods:
- Energetic considerations and scaling arguments were employed.
- Analysis of subcritical bifurcation from a compressed state.
- Development of a model to construct a bifurcation diagram.
Main Results:
- Delamination is governed by three dimensionless groups: confinement, extensibility, and bendability.
- Two asymptotic regimes were identified, leading to distinct delamination shapes: large-slope 'folds' and small-slope 'rucks'.
- The amplitude of delamination scales differently with confinement in each regime.
Conclusions:
- The study provides a comprehensive framework for understanding adhesive sheet delamination.
- Material properties significantly influence the delamination pathway and resulting morphology.
- The developed model aids in predicting delamination behavior.
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