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Area of Science:

  • Tribology
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Viscous adhesion is crucial for material interfaces.
  • Understanding debonding from soft surfaces is key for applications like adhesives and biomaterials.
  • Elastohydrodynamics governs fluid behavior between deforming surfaces.

Purpose of the Study:

  • To investigate viscous adhesion between a rigid sphere and soft surfaces in silicone oil.
  • To analyze the effect of surface compliance on adhesive strength and debonding mechanisms.
  • To develop and validate an elastohydrodynamic model for soft surface detachment.

Main Methods:

  • Sphere-plane geometry for adhesion measurements.
  • Recording force-displacement and fluid film thickness-time data.
  • Comparison of experimental data with a novel elastohydrodynamic model.

Main Results:

  • Increased surface compliance decreases adhesive strength due to elastohydrodynamic deformation.
  • The model accurately predicts experimental force-displacement and film thickness data.
  • Soft surfaces exhibit non-monotonic pressure drops and stagnation points during debonding.
  • Debonding occurs via a peeling front, even without solid-solid contact, driven by elastohydrodynamic effects.

Conclusions:

  • Elastohydrodynamic deformation significantly influences viscous adhesion and debonding dynamics.
  • The presence of soft surfaces introduces unique fluid behaviors, including stagnation points and peeling fronts.
  • This research offers insights for designing materials with tailored adhesive properties for various technological applications.