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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Forming, Confining, and Observing Microtubule-Based Active Nematics
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Sliding Avalanches Between Nacreous Tablets.

Saleh Alghamdi1,2, Zhuang Liu3, Fen Du4

  • 1Department of Civil and Environmental Engineering, 33 Colchester Avenue, University of Vermont, Burlington, Vermont 05405, United States.

Nano Letters
|June 9, 2020
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Summary
This summary is machine-generated.

Nacre

Keywords:
AvalancheLaminated NanomaterialsMean-Field TheoryNacreTorsion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Tribology

Background:

  • Nacre (mother of pearl) exhibits remarkable mechanical properties due to its hierarchical "brick-and-mortar" microstructure.
  • Understanding nanoasperity interactions during sliding is crucial for explaining nacre's properties.

Purpose of the Study:

  • To investigate slip events between nanograins in nacre's microlayers during torsion-induced sliding.
  • To model these slips as avalanches and analyze their statistical and dynamic properties.

Main Methods:

  • High temporal resolution measurement of slip events during torsion-induced sliding.
  • Modeling slip events as avalanches driven by atomic interactions on nanograin surfaces.
  • Analysis of power laws and scaling functions for slip event statistics and dynamics.

Main Results:

  • Slip events were modeled as avalanches, revealing power-law statistics.
  • The largest avalanches occurred upon nanograin separation after maximum contact.
  • Measurements and predictions showed good agreement, confirming avalanche dynamics in nacre sliding.

Conclusions:

  • Avalanche dynamics are fundamental to the inhomogeneous sliding of nacreous tablets.
  • This research provides insights into nanofriction, potentially aiding the development of nanoscale tribological systems.