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Static friction aging is influenced by contact area aging and shear-induced memory erasure. Shear load changes accelerate or decelerate friction aging by altering interfacial memory, but not contact area aging.

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Area of Science:

  • Tribology
  • Materials Science
  • Physics of Interfaces

Background:

  • Static friction and real contact area growth exhibit time-dependent 'aging'.
  • These phenomena are traditionally considered coupled and equivalent under static conditions.

Purpose of the Study:

  • To investigate the relationship between frictional aging and the aging of the real contact area.
  • To elucidate the role of shear load variations in modifying frictional aging rates.

Main Methods:

  • Simultaneous measurement of static friction and real area of contact.
  • Controlled application and variation of static shear loads.
  • Analysis of interfacial memory-erasure effects.

Main Results:

  • Frictional aging rate depends on contact area aging and shear-induced memory erasure.
  • Static shear load application accelerates friction aging, independent of contact area aging.
  • Geometric effects (tilts) from shear changes cause memory erasure, influencing aging rates.

Conclusions:

  • Frictional aging is decoupled from contact area aging due to shear-induced memory erasure.
  • Modifying loading points can eliminate shear effects on aging.
  • Cycling static shear loads can be used to accelerate frictional aging.