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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.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
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Types of Friction Problems01:27

Types of Friction Problems

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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion....
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Dry Friction01:30

Dry Friction

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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.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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Frictional Force01:07

Frictional Force

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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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Friction: Problem Solving01:21

Friction: Problem Solving

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Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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  1. Home
  3. A Discrete Elements Study Of The Frictional Behavior Of Fault Gouges.
  1. Home
  3. A Discrete Elements Study Of The Frictional Behavior Of Fault Gouges.

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The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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A Discrete Elements Study of the Frictional Behavior of Fault Gouges.

E Papachristos1, I Stefanou1, J Sulem2

  • 1Nantes Université, Ecole Centrale Nantes, CNRS, Institut de Recherche en Génie Civil et Mécanique (GeM), UMR 6183 Nantes France.

Journal of Geophysical Research. Solid Earth
|April 10, 2023

View abstract on PubMed

Summary
This summary is machine-generated.

Discrete element simulations reveal that mean particle size, not distribution or randomness, controls shear band formation in fault gouge. This finding aids in developing constitutive models for seismic zone rheology.

Keywords:
discrete elements methodearthquakesfault gougefrictionshear bandsstick‐slip

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Area of Science:

  • Geophysics
  • Computational Rock Mechanics
  • Tribology

Background:

  • Fault gouge rheology is critical for understanding earthquake mechanics.
  • Previous studies often simplify gouge particle characteristics and loading conditions.
  • Simulating complex fault zone processes requires advanced computational methods.

Purpose of the Study:

  • To investigate the frictional response of fault gouge under seismogenic zone conditions.
  • To explore the influence of particle size, polydispersity, and shearing velocity on gouge behavior.
  • To identify key parameters controlling shear band formation and frictional evolution.

Main Methods:

  • Discrete element simulations (DEM) were employed.
  • Monte-Carlo analyses were used to assess statistical effects.
  • Simulations considered ultra-cataclastic flow and consolidated loading conditions.

    • Main Results:

    • Local stick-slip events diminish with large-scale averaging.
    • Frictional response is largely insensitive to particle position randomness and size distribution.
    • Mean particle size dictates shear band formation and thickness.
    • Friction evolution follows an exponential decay law dependent on particle size and slip distance.

    Conclusions:

    • Mean particle size is a dominant factor in fault gouge frictional behavior and shear band development.
    • Shearing velocity plays a minor role under studied seismogenic conditions.
    • Findings inform constitutive model development for continuum-based fault modeling and multiphysics analyses.