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Confinement-induced instability and adhesive failure between dissimilar thin elastic films.
J Y Chung1, K H Kim, M K Chaudhury
1Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015, USA.
The European Physical Journal. E, Soft Matter
|May 31, 2006
Summary
Separating soft elastomeric films causes elastic instability. Unlike single films, the two-film instability depends on material properties and film thicknesses, impacting adhesive compliance and debonding energy.
Area of Science:
- Materials Science
- Solid Mechanics
- Soft Matter Physics
Background:
- Elastic instability occurs when separating soft elastomeric films.
- This phenomenon differs from a soft film separating from a rigid surface.
- Instability in single films is thickness-dependent, not material-dependent.
Purpose of the Study:
- Investigate the elastic instability at the interface of two separating soft elastomeric films.
- Compare this instability to the single-film case.
- Understand the role of material properties and thicknesses in the two-film instability.
Main Methods:
- Utilized energy minimization procedures to analyze the instability.
- Characterized the cooperative instability mode in the two-film system.
Main Results:
- The two-film instability is a non-linear function of film thicknesses and elastic moduli.
- A cooperative instability mode develops in the two-film system.
- Instability wavelength in the two-film case is not solely dependent on film thickness.
Conclusions:
- The cooperative instability in two soft films is complex, depending on multiple material and geometric parameters.
- Understanding this instability is crucial for predicting adhesive compliance and energy release rates during soft interface debonding.