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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...
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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 reloaded.
Hooke's Law01:26

Hooke's Law

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Related Experiment Video

Determining the Mechanical Strength of Ultra-Fine-Grained Metals
05:04

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Subyield Dynamics in Yield-Stress Materials.

Alice Woodbridge1, Kasra Amini2, Fredrik Lundell2

  • 1The University of Manchester, Department of Physics and Astronomy and Manchester Centre for Nonlinear Dynamics, Oxford Road, Manchester M13 9PL, United Kingdom.

Physical Review Letters
|May 11, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Yield-stress materials below their yield point exhibit nonlinear viscoelasticity, not flow. Experiments show bounded, periodic strain responses, challenging models that predict plastic flow or pure elasticity in this regime.

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Practical Considerations for the Design, Execution, and Interpretation of Studies Involving Whole-Bone Bending Tests of Rodent Bones
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Practical Considerations for the Design, Execution, and Interpretation of Studies Involving Whole-Bone Bending Tests of Rodent Bones

Published on: September 1, 2023

Related Experiment Videos

Determining the Mechanical Strength of Ultra-Fine-Grained Metals
05:04

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Practical Considerations for the Design, Execution, and Interpretation of Studies Involving Whole-Bone Bending Tests of Rodent Bones
04:20

Practical Considerations for the Design, Execution, and Interpretation of Studies Involving Whole-Bone Bending Tests of Rodent Bones

Published on: September 1, 2023

Area of Science:

  • Rheology
  • Materials Science
  • Soft Matter Physics

Background:

  • The mechanical response of yield-stress materials below the yield point is debated.
  • Conflicting constitutive models exist: one allows plastic flow, another assumes viscoelasticity below yield.

Purpose of the Study:

  • To investigate the subyield behavior of microgels and emulsions.
  • To determine if these materials flow or exhibit elastic behavior below the yield point.

Main Methods:

  • Parallel superposition rheometry was employed.
  • Residual slip effects were carefully accounted for.

Main Results:

  • Both microgel and emulsion samples showed bounded, periodic strain responses.
  • Compelling evidence suggests no flow occurs in the studied subyield regime.

    • Conclusions:

    • The subyield regime is characterized by nonlinear viscoelasticity.
    • Improved constitutive relations are needed to capture subyield nonlinearities without equating yielding to nonlinearity.