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Related Concept Videos

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
Dry Friction01:30

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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Journal Bearings01:23

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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
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Characteristics of Dry Friction01:21

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Rolling With Slipping01:14

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Related Experiment Video

Updated: Jun 3, 2026

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
07:39

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults

Published on: November 6, 2021

Fault lubrication during earthquakes.

G Di Toro1, R Han, T Hirose

  • 1Dipartimento di Geoscienze, Università di Padova, Padova 35131, Italy. giulio.ditoro@unipd.it

Nature
|March 25, 2011
PubMed
Summary
This summary is machine-generated.

Rock friction significantly decreases during seismic slip, a phenomenon termed fault lubrication. This lubrication, driven by physicochemical processes, occurs in various rock types and is crucial for understanding earthquake mechanics.

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Last Updated: Jun 3, 2026

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
07:39

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults

Published on: November 6, 2021

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
09:21

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

Published on: September 28, 2015

Area of Science:

  • Geophysics
  • Earthquake Mechanics
  • Rock Physics

Background:

  • Fault friction is critical for earthquake mechanics, influencing stress drop and energy release.
  • Seismological methods for determining fault friction are challenging, necessitating experimental approaches.

Purpose of the Study:

  • To review experimental data on rock friction at seismic slip rates.
  • To elucidate the mechanisms and extent of fault lubrication during earthquakes.

Main Methods:

  • Analysis of approximately 300 published and unpublished experiments.
  • Utilized rotary shear apparatus to simulate seismic slip rates (0.1-2.6 m/s).

Main Results:

  • Observed a significant decrease in rock friction (up to one order of magnitude) at seismic slip rates.
  • Identified physicochemical processes (e.g., gelification, dehydration, melting) as drivers of fault lubrication.
  • Experimental results align with natural fault products and seismological estimates.

Conclusions:

  • Faults likely experience lubrication during earthquakes, regardless of rock composition or weakening mechanisms.
  • Experimental findings are relevant for understanding earthquake nucleation at depths of 7-15 km.