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Friction in rough contacts of linear viscoelastic surfaces with anisotropic statistical properties
Luciano Afferrante1, Carmine Putignano2, Nicola Menga2
1Department of Mechanics, Mathematics and Management, Politecnico of Bari, V.le Japigia, 182, 70126, Bari, Italy. luciano.afferrante@poliba.it.
The European Physical Journal. E, Soft Matter
|June 27, 2019
Summary
Viscoelasticity significantly impacts contact mechanics on rough surfaces. A perpendicular force arises from non-symmetric pressure, crucial for system equilibrium but not energy dissipation.
Area of Science:
- Materials Science
- Physics
- Tribology
Background:
- Viscoelastic rheology influences contact mechanics on rough surfaces.
- Anisotropic statistical properties of surfaces are key factors.
Purpose of the Study:
- Investigate the effects of viscoelasticity on contact mechanics.
- Calculate forces arising from viscous dissipation in viscoelastic contacts.
Main Methods:
- Utilized Persson's theory for analysis.
- Calculated forces due to viscous dissipation.
- Compared results with numerical exact calculations.
Main Results:
- Viscous dissipation in bulk material generates forces in viscoelastic contacts.
- Non-symmetric normal contact pressure leads to a perpendicular force.
- This perpendicular force is vital for global system equilibrium.
Conclusions:
- Persson's theory provides a good approximation for viscoelastic contact forces.
- The current method does not capture contact cluster stretching due to viscoelasticity.
- Changes in surface anisotropy due to viscoelasticity are not captured by this model.
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