Adhesive contact of rough brushes
Qiang Li1, Valentin L Popov1,2,3
1Berlin University of Technology, 10623 Berlin, Germany.
Beilstein Journal of Nanotechnology
|September 27, 2018
Summary
Contact splitting in rough, brush-like structures does not improve adhesion. Increased roughness decreases adhesive strength and makes pull-off force dependent on prior compression, impacting biomimetic materials.
Area of Science:
- Physics
- Materials Science
- Biomimetics
Background:
- Adhesive contact mechanics are crucial for understanding gecko feet and biomimetic materials.
- Contact splitting's role in adhesion is debated, particularly for structured surfaces.
Purpose of the Study:
- To numerically simulate adhesive contact between brush-like structures and elastic materials.
- To investigate the effect of roughness and contact splitting on adhesion strength.
Main Methods:
- Utilizing the fast Fourier transform (FFT)-based boundary element method.
- Employing the mesh-dependent detachment criterion of Pohrt and Popov.
- Simulating rigid brushes with varying pillar heights and statistical scatter.
Main Results:
- Contact splitting does not enhance adhesion, even with uniform pillar heights.
- Statistical height variations decrease maximum adhesive strength.
- Pull-off force becomes compression-dependent and vanishes at critical roughness.
Conclusions:
- Roughness significantly impacts adhesion, reducing strength and altering pull-off force behavior.
- Finite size effects modify established adhesion theories for brush-like structures.
- Findings provide insights into adhesion mechanisms in natural and artificial systems.
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