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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.
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Plastic Deformations01:14

Plastic Deformations

It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
Plastic Deformations01:19

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
Irrotational Flow01:28

Irrotational Flow

Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:

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Related Experiment Video

Updated: May 13, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

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Published on: May 15, 2017

Intermittent dislocation flow in viscoplastic deformation.

M C Miguel1, A Vespignani, S Zapperi

  • 1The Abdus Salam International Centre for Theoretical Physics, PO Box 586, 34100 Trieste, Italy. carmen@ffn.ub.es

Nature
|April 5, 2001
PubMed
Summary
This summary is machine-generated.

Dislocations in crystalline materials exhibit scale-free intermittent motion during viscoplastic deformation. This finding, observed in stressed ice, reveals a generic dynamical picture of plasticity beyond standard models.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid Mechanics

Background:

  • Viscoplastic deformation (creep) in crystalline materials is driven by the collective motion of interacting dislocations.
  • Previous studies utilized analytical methods and dislocation dynamics simulations for patterning and constitutive laws.
  • A statistical analysis of interacting dislocation dynamics was previously lacking.

Purpose of the Study:

  • To perform a statistical analysis of interacting dislocation dynamics.
  • To investigate the nature of dislocation motion during viscoplastic deformation.
  • To develop a more comprehensive framework for understanding plasticity.

Main Methods:

  • Acoustic emission measurements on stressed ice single crystals.
  • Numerical simulations of a model of interacting dislocations.
  • Statistical analysis of dislocation dynamics.

Main Results:

  • Dislocation motion was found to be scale-free and intermittent.
  • Numerical simulations successfully reproduced experimental observations.
  • A configuration landscape with rapid collective rearrangements was identified.

Conclusions:

  • Dislocation dynamics in viscoplastic deformation exhibit intermittent behavior due to collective rearrangements.
  • This dynamical picture is likely generic across various crystalline materials.
  • The findings offer a new framework for plasticity that moves beyond mean-field approaches.