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Transition from isometric to stretching ridges in thin elastic films
J F Fuentealba1, O Albarrán1, E Hamm1
1Departamento de Física, Universidad de Santiago, Avenida Ecuador 3493, Estación Central, Santiago, Chile.
Summary
Thin elastic films form ridges that can be isometric or stretching. A ridge is isometric if its width exceeds a characteristic cutoff length, distinguishing it from stretching ridges found in crumpled films.
Area of Science:
- Materials Science
- Mechanics of Materials
- Surface Physics
Background:
- Thin elastic films readily deform into ridges to bridge flat regions.
- Ridge formation in films is influenced by applied forces and boundary conditions.
- Two types of ridges exist: isometric (no stretching) and stretching (involving bending and stretching).
Purpose of the Study:
- To investigate the transition between isometric and stretching ridges in thin elastic films.
- To identify key parameters governing ridge type.
- To understand the role of ridge width in determining deformation modes.
Main Methods:
- Analysis of a simplified thin elastic film configuration.
- Observation of ridge formation under varying conditions.
- Determination of characteristic length scales for ridge deformation.
Main Results:
- A transition point between isometric and stretching ridges was observed.
- The transversal size of a stretching ridge functions as a critical cutoff length scale.
- Isometric ridges were identified when their width surpassed this characteristic length.
Conclusions:
- Ridge type in thin elastic films is determined by a width-dependent length scale.
- This finding provides insight into the mechanics of thin film deformation and wrinkling.
- The study clarifies the conditions under which elastic energy is relaxed through isometric versus stretching deformations.
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