Journal
TRIBOLOGY LETTERS
Volume 70, Issue 3, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-022-01619-x
Keywords
Friction; Avalanches; Tribology; Solid Lubricants; MoS2; Critical phenomena
Categories
Funding
- Center for Integrated Nanotechnologies, a Department of Energy office of Basic Energy Sciences
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
- Laboratory Directed Research and Development program at Sandia National Laboratories
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The study found that the friction force of molybdenum disulfide can be characterized as a series of predictable "avalanches", covering a wide range of scales. Both the statistics and dynamics of these avalanches match model predictions, demonstrating a consistent behavior of friction across different scales.
Steady-state fluctuations in the friction force of molybdenum disulfide (MoS2), a prototypical lamellar solid, were analyzed experimentally for newton-scale forces and computationally via molecular dynamics simulations for nanonewton-scale forces. A mean field model links the statics and the dynamics of the friction behavior across these eight orders of magnitude in friction force and six orders of magnitude in friction force fluctuations (i.e., avalanches). Both the statistics and dynamics of the avalanches match model predictions, indicating that friction can be characterized as a series of avalanches with properties that are predictable over a wide range of scales.
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