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Related Concept Videos

Shearing Strain01:20

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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...
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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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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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Plastic Behavior01:21

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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...
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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...
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Updated: Dec 25, 2025

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Shear Induced Interactions Cause Polymer Compression.

Dave E Dunstan1, Dalton J E Harvie2

  • 1Department of Chemical Engineering, University of Melbourne, VIC, 3010, Australia. davided@unimelb.edu.au.

Scientific Reports
|March 29, 2020
PubMed
Summary
This summary is machine-generated.

Shear induced particle pressure in concentrated suspensions compresses polymer chains, reducing viscosity and blob size with increasing shear rate. This phenomenon explains observed polymer rheology behavior.

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Area of Science:

  • Rheology
  • Polymer Science
  • Suspension Mechanics

Background:

  • Concentrated particle suspensions exhibit shear induced particle pressure.
  • This pressure's significance in polymer rheology has been overlooked.
  • Shear induced particle pressure exerts an inward force on polymer chains.

Purpose of the Study:

  • To investigate the role of shear induced particle pressure in polymer rheology.
  • To analyze the impact of this pressure on polymer chain compression and viscosity.
  • To develop analytical models incorporating shear induced particle pressure.

Main Methods:

  • Formulating force balance equations that include shear induced particle pressure.
  • Analyzing the predicted effects on polymer blob size and viscosity.
  • Comparing model predictions with experimental observations in concentrated polymer systems.

Main Results:

  • Shear induced particle pressure leads to a shear-dependent compressive force on polymer chains.
  • Analytical models predict reduced polymer blob size with increasing shear rate.
  • Models predict decreasing viscosity with increasing shear rate, consistent with experimental data.
  • Power law behavior for viscosity is predicted, aligning with observations in concentrated polymer rheology.

Conclusions:

  • Shear induced particle pressure is a critical factor in concentrated polymer rheology.
  • This pressure explains the observed reduction in viscosity and polymer blob size at higher shear rates.
  • The findings necessitate incorporating shear induced particle pressure into rheological models for polymers.