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Related Concept Videos

Plastic Behavior01:21

Plastic Behavior

A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
Stress-Strain Diagram - Brittle Materials01:24

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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First Law: Particles in One-dimensional Equilibrium01:10

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Published on: November 22, 2021

Avalanches in strained amorphous solids: does inertia destroy critical behavior?

K Michael Salerno1, Craig E Maloney, Mark O Robbins

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Inertia influences the shear behavior of amorphous solids, shifting them to a new underdamped universality class. This finding impacts our understanding of material deformation and critical phenomena in disordered systems.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Published on: June 7, 2018

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • Amorphous solids exhibit complex shear behavior, often characterized by avalanches.
  • The role of inertia in these systems has been a subject of debate, with previous assumptions suggesting it drives systems away from criticality.

Purpose of the Study:

  • To investigate the effect of inertia on the athermal shear of amorphous two-dimensional solids.
  • To determine the universality class of these systems under different damping conditions.

Main Methods:

  • Computational simulations involving thousands to millions of disks were employed.
  • Finite-size scaling analysis was used to study avalanche distributions.

Main Results:

  • Inertia shifts the system to a novel underdamped universality class, contrary to prior beliefs.
  • Scaling exponents were determined for both underdamped and overdamped regimes.
  • A critical damping value separating these regimes was identified.

Conclusions:

  • Inertia plays a crucial role in defining the critical behavior of amorphous solids during shear.
  • Systems can remain in the overdamped universality class even with significant underdamped vibrational modes.