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Related Concept Videos

Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as the...
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.
Residual Stresses01:26

Residual Stresses

Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Types of Fluids01:27

Types of Fluids

Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and their...

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Related Experiment Video

Updated: May 31, 2026

Macro-Rheology Characterization of Gill Raker Mucus in the Silver Carp, Hypophthalmichthys molitrix
09:13

Macro-Rheology Characterization of Gill Raker Mucus in the Silver Carp, Hypophthalmichthys molitrix

Published on: July 10, 2020

Coiling of yield stress fluids.

Yasser Rahmani1, Mehdi Habibi, Arman Javadi

  • 1Department of Physics, Institute for Advanced Studies in Basic Sciences, Zanjan 45137-66731, Iran.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 7, 2011
PubMed
Summary

We studied how yield stress fluids like shaving foam and hair gel coil when falling. Foam behaved elastically, while gel showed liquid-like coiling, with no inertial effects observed.

Area of Science:

  • Rheology
  • Fluid Dynamics
  • Materials Science

Background:

  • Yield stress fluids exhibit complex flow behaviors distinct from Newtonian fluids.
  • Understanding fluid coiling is crucial for applications in materials processing and product formulation.

Purpose of the Study:

  • To experimentally investigate the coiling dynamics of yield stress fluids impacting a solid surface.
  • To differentiate the coiling mechanisms of different yield stress fluids, specifically shaving foam and hair gel.

Main Methods:

  • Filament coiling experiments were conducted using shaving foam and hair gel.
  • Observations focused on the distinct coiling regimes and behaviors under gravitational and viscous forces.

Main Results:

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Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
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Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes

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Last Updated: May 31, 2026

Macro-Rheology Characterization of Gill Raker Mucus in the Silver Carp, Hypophthalmichthys molitrix
09:13

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Published on: July 10, 2020

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

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Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
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Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes

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  • Shaving foam exhibited elastic and gravitational coiling regimes, resembling an elastic rope.
  • Hair gel displayed viscous and gravitational coiling, similar to liquid systems.
  • Instabilities and filament breakup prevented the observation of an inertial coiling regime for both fluids.

Conclusions:

  • The coiling behavior of yield stress fluids is highly dependent on their rheological properties.
  • Distinct elastic and viscous characteristics dictate the observed coiling regimes, differentiating foam and gel behaviors.
  • Further research is needed to explore inertial regimes under controlled conditions, avoiding instabilities.