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Related Concept Videos

Plastic Behavior01:21

Plastic Behavior

196
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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Revisiting the strain-induced softening behaviour in hydrogels.

L K R Duarte1,2, L G Rizzi1

  • 1Departamento de Física, Universidade Federal de Viçosa (UFV), Av. P. H. Rolfs, s/n, 36570-900, Viçosa, Brazil. lerizzi@ufv.br.

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Hydrogel softening is often linked to network damage. This study shows that polymer-solvent interactions, not just network rupture, can cause this softening in rubber-like gels.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Soft Matter

Background:

  • Strain-induced softening in hydrogels is commonly attributed to network structure breakage.
  • Understanding the mechanisms behind hydrogel mechanical behavior is crucial for material design.

Purpose of the Study:

  • To investigate alternative mechanisms for strain-induced softening in hydrogels.
  • To challenge the conventional explanation of network breakage as the sole cause of softening.

Main Methods:

  • Utilized a stress-strain relationship derived from a coarse-grained model.
  • Analyzed the energy-related contribution to the elastic modulus.
  • Compared theoretical predictions with experimental data from various hydrogels.

Main Results:

  • Demonstrated that network rupture is not essential for observing softening behavior.
  • Linked the decrease in differential modulus (K(T,γ)) to energy-related contributions.
  • Showed that polymer-solvent interactions can drive softening.

Conclusions:

  • Softening in hydrogels can arise from polymer-solvent interactions, not solely from network damage.
  • The proposed model provides a new perspective on hydrogel mechanics.
  • Findings are validated by experimental data from tetra-PEG hydrogels and others.