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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Rough viscoelastic sliding contact: theory and experiments.

G Carbone1, C Putignano1

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This study demonstrates how numerical theory can simulate viscoelastic rough contact, revealing that viscoelasticity significantly impacts friction and contact area anisotropy. Accounting for these effects is crucial for accurate modeling of sliding rough surfaces.

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Area of Science:

  • Solid Mechanics
  • Tribology
  • Computational Materials Science

Background:

  • Studying contact mechanics of rough surfaces is essential for understanding material wear and performance.
  • Viscoelasticity, the property of materials to dissipate energy under deformation, plays a critical role in dynamic contact scenarios.
  • Existing numerical methods often struggle with the complexity of simulating viscoelastic rough contact.

Purpose of the Study:

  • To apply a novel numerical theory for simulating contact between viscoelastic rough solids.
  • To investigate the influence of viscoelastic effects on friction and contact area.
  • To compare numerical predictions with experimental data for validation.

Main Methods:

  • Utilized a previously developed numerical theory for contact mechanics.
  • Employed an adaptive nonuniform mesh to manage computational complexity.
  • Simulated sliding contact between viscoelastic rough surfaces under varying conditions.

Main Results:

  • Viscoelastic effects significantly influence the simulation of sliding rough contact, particularly viscoelastic friction.
  • Numerical predictions of viscoelastic friction show good agreement with experimental outcomes.
  • Viscoelasticity induces anisotropy in the contact solution, stretching the contact region perpendicular to the sliding direction.

Conclusions:

  • The presented numerical methodology is effective for studying viscoelastic rough contact.
  • Accurate simulation of sliding rough contact requires the inclusion of viscoelastic effects.
  • Viscoelasticity is a key factor in both energy dissipation (friction) and geometric anisotropy of the contact area.