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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...
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Nonlinear viscoelasticity and shear localization at complex fluid interfaces.

Philipp Erni1, Alan Parker

  • 1Firmenich SA, Materials Science Department, Corporate Research Division, Meyrin 2, Genève, Switzerland. philipp.erni@firmenich.com

Langmuir : the ACS Journal of Surfaces and Colloids
|May 9, 2012
PubMed
Summary
This summary is machine-generated.

Acacia gum forms soft-solid interfacial layers that exhibit nonlinear viscoelasticity under large deformations. This study quantifies yielding and plastic energy dissipation, revealing shear localization during flow transitions.

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Area of Science:

  • Materials Science
  • Rheology
  • Colloid and Surface Science

Background:

  • Foams and emulsions experience large interfacial deformations under external fields, exceeding linear viscoelastic limits.
  • Understanding nonlinear interfacial rheology is crucial for predicting material behavior in complex systems.

Purpose of the Study:

  • To investigate the nonlinear and transient interfacial rheology of Acacia gum adsorption layers.
  • To quantify the nonlinear flow properties and yielding behavior of soft-solid interfacial layers.

Main Methods:

  • Utilized a biconical disk interfacial rheometer for large-amplitude oscillatory shear flow experiments.
  • Analyzed nonlinear stress response using Lissajous curves and in situ flow visualization.
  • Employed opposing stress pulses to probe yielding and permanent deformation.

Main Results:

  • Quantified nonlinear viscoelastic measures including intracycle moduli and plastic energy dissipation.
  • Demonstrated that nonlinear viscoelasticity onset correlates with interfacial shear localization.
  • Extracted critical interfacial stress and permanent deformation upon yielding.

Conclusions:

  • Acacia gum exhibits significant nonlinear interfacial rheology, characterized by yielding and shear localization.
  • The study provides quantitative insights into the transition to nonlinear flow in soft-solid interfacial layers.
  • Developed experimental methods to characterize interfacial yielding and permanent deformation.