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Peeling off an adhesive layer with spatially varying modulus.

Animangsu Ghatak1

  • 1Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 7, 2010
PubMed
Summary

This study reveals that periodically varying adhesive modulus causes intermittent crack propagation during peeling. This intermittent behavior enhances fracture toughness, offering design principles for advanced adhesive materials.

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Measuring and Modeling Contractile Drying in Human Stratum Corneum
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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Adhesion Science

Background:

  • Adhesive peeling is critical in flexible electronics and coatings.
  • Uniform elastic modulus in adhesives can lead to continuous crack propagation.
  • Understanding crack dynamics in non-uniform adhesives is crucial for performance.

Purpose of the Study:

  • To analyze the displacement-controlled peeling of flexible adherents from elastic adhesives with spatially varying modulus.
  • To investigate the crack propagation behavior and fracture toughness under these conditions.
  • To establish design criteria for adhesive layers with modulated physical properties.

Main Methods:

  • Theoretical analysis of crack propagation during peeling.
  • Modeling of elastic adhesive layers with periodically varying elastic modulus.
  • Calculation of crack arrest and initiation points.
  • Evaluation of fracture toughness as a function of material and geometric parameters.

Main Results:

  • Crack propagation is intermittent, with arrests near minimum shear modulus locations.
  • Fracture toughness is significantly enhanced compared to uniform adhesives.
  • Fracture toughness increases with layer thickness and modulus variation amplitude.
  • Non-monotonic relationship observed between fracture toughness and wavelength of modulus variation.

Conclusions:

  • Spatially modulated physical properties in adhesives can enhance fracture toughness.
  • Intermittent crack propagation is a key mechanism for improved adhesion.
  • Design principles for advanced adhesives with tailored properties can be derived from these findings.