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Related Concept Videos

Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Superlubric polycrystalline graphene interfaces.

Xiang Gao1, Wengen Ouyang2, Michael Urbakh3

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Corrugated grain boundaries in graphitic contacts show complex friction behavior due to dislocation buckling. This finding helps predict friction in large-scale layered materials and achieve superlubricity.

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Understanding friction in polycrystalline graphitic materials is crucial for advanced applications.
  • Grain boundaries significantly influence the mechanical and tribological properties of layered materials.

Purpose of the Study:

  • To investigate the impact of corrugated grain boundaries on the frictional properties of graphitic contacts.
  • To elucidate the underlying mechanisms governing friction in polycrystalline graphitic interfaces.

Main Methods:

  • Utilized molecular dynamics simulations to model extended planar graphitic contacts with polycrystalline surfaces.
  • Analyzed shear-induced buckling and unbuckling of corrugated grain boundary dislocations.
  • Developed a phenomenological two-state model to capture observed tribological behaviors.

Main Results:

  • Kinetic friction exhibits nonmonotonic behavior with respect to normal load and temperature.
  • Friction is dominated by shear-induced dislocation buckling and unbuckling at grain boundaries.
  • A competition between increased buckling probability and decreased dissipated energy per event drives friction changes.

Conclusions:

  • The developed two-state model accurately characterizes tribological properties of large-scale polycrystalline interfaces.
  • Negative differential friction coefficients in the high-load regime can mitigate linear friction scaling.
  • The findings pave the way for restoring structural superlubricity in graphitic materials at larger scales.