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Related Concept Videos

Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.

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Related Experiment Video

Updated: May 26, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
06:07

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Long-range strain correlations in sheared colloidal glasses.

Vijayakumar Chikkadi1, Gerard Wegdam, Daniel Bonn

  • 1Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.

Physical Review Letters
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

Researchers observed long-range correlations in deforming colloidal glasses, revealing how particle motion influences material properties. This finding is crucial for understanding the slow relaxation and solid-like behavior of glasses.

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Last Updated: May 26, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Published on: April 25, 2019

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Rheology

Background:

  • Glasses exhibit solid-like behavior due to slow particle relaxation.
  • Cooperative particle motion and dynamic length scales are thought to drive this slow response.
  • Long-range correlations in quiescent glasses have been difficult to observe experimentally.

Purpose of the Study:

  • To provide direct experimental evidence of long-range correlations in deforming colloidal glasses.
  • To investigate the scaling and spatial symmetry of these correlations.
  • To explore the role of strain correlations in the transition to inhomogeneous flow.

Main Methods:

  • Deformation of a dense colloidal glass under external stress.
  • Experimental observation of microscopic strain fluctuations.
  • Analysis of correlation scaling and spatial symmetry.

Main Results:

  • Direct experimental evidence of long-range correlations during glass deformation was obtained.
  • Long-range correlations were identified in microscopic strain fluctuations.
  • A transition from homogeneous to inhomogeneous flow was observed at a critical shear rate.

Conclusions:

  • Long-range correlations are present during the deformation of colloidal glasses.
  • These correlations play a role in the observed transition to inhomogeneous flow.
  • The findings challenge previous limitations in observing long-range correlations in glasses.