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Localization through surface folding in solid foams under compression.

P M Reis1, F Corson, A Boudaoud

  • 1Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. preis@mit.edu

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Localized folds emerge in compressed elastic-coated foam past a critical threshold. This phenomenon, driven by surface film instability, is accurately modeled by a new hybrid theory, revealing strain distribution characteristics.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Surface Physics

Background:

  • Solid foams coated with elastic films are common in various applications.
  • Understanding their mechanical behavior under compression is crucial for material design.
  • Surface instabilities can significantly alter material properties.

Purpose of the Study:

  • To investigate the mechanical response of elastic-coated solid foam under compression.
  • To identify the conditions leading to fold formation.
  • To develop a theoretical model for predicting fold characteristics.

Main Methods:

  • Combined experimental and theoretical approach.
  • Optical surface measurements to analyze fold patterns and strain distributions.
  • Hybrid continuum and statistical modeling.

Main Results:

  • A critical compression threshold was identified, beyond which localized folds appear.
  • Fold size is determined by the elastic film's instability.
  • Strain distributions exhibit robust exponential tails.
  • The developed theory accurately predicts fold nucleation and length scale.

Conclusions:

  • Surface film instability dictates fold formation in compressed elastic-coated foams.
  • The hybrid model provides a robust framework for understanding these localized deformation phenomena.
  • This research offers insights into the mechanics of structured materials with surface coatings.