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Related Concept Videos

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.
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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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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.
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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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Spongelike Rigid Structures in Frictional Granular Packings.

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Rigidity in sheared granular materials emerges through mesoscale arch structures and hinges. These findings reveal a spongelike morphology with rigid backbones and particle-filled holes as jamming occurs.

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Area of Science:

  • Physics
  • Materials Science
  • Mechanical Engineering

Background:

  • Granular materials exhibit complex mechanical behaviors under shear stress.
  • Understanding the emergence of rigidity is crucial for predicting material failure and stability.
  • Previous studies have focused on force chains, but mesoscale structures are less understood.

Purpose of the Study:

  • To investigate the emergence of mechanical rigidity in sheared 2D frictional granular materials.
  • To identify and characterize the mesoscale structures responsible for rigidity.
  • To compare different methods for detecting rigid structures in granular systems.

Main Methods:

  • Utilized generalizations of two methods: force-based dynamical matrix and topology-based rigidity percolation.
  • Performed experiments on sheared two-dimensional frictional granular materials.
  • Analyzed the critical contact number (z_c) at which jamming occurs.

Main Results:

  • Both methods consistently identified similar rigid structures.
  • A critical contact number (z_c = 2.4 ± 0.1) was identified for jamming.
  • A spongelike morphology emerged, characterized by a rigid backbone and floppy, particle-filled holes of various sizes.
  • Rigid structures exhibited higher internal pressure than surrounding areas but were distinct from force chains.

Conclusions:

  • Rigidity in sheared granular materials arises from mesoscale arch structures and hinges.
  • The identified spongelike morphology is key to understanding mechanical stability.
  • Future research should focus on the role of these mesoscale structures in granular material behavior.