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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Mechanical stress in disordered materials can induce nonaffine deformation, deviating from uniform affine transformation, even within the elastic regime.
  • Nonaffinity has been observed in simulations and experimentally in systems like colloidal gels, but its low amplitude and local nature pose experimental challenges.
  • Understanding nonaffine deformation is crucial for characterizing the mechanical response and failure mechanisms of amorphous materials.

Purpose of the Study:

  • To present a novel experimental method for detecting and quantifying nonaffine displacements in amorphous materials under elastic deformation.
  • To overcome the experimental challenges associated with the low amplitude and local character of nonaffinity.
  • To provide a model for analyzing the coupled effects influencing nonaffine behavior.

Main Methods:

  • Utilized phase compensation of scattered waves from a thermally dilated amorphous material (glass frit).
  • Employed fine wavelength tuning of the optical probe beam to enhance sensitivity.
  • Developed a theoretical model to analyze the interplay between thermal expansion and wavelength changes for quantifying nonaffinity.

Main Results:

  • Successfully confirmed the occurrence of nonaffinity in the elastic regime of a glass frit sample.
  • Demonstrated the complete reversibility of material deformation under the experimental conditions.
  • Quantified the magnitude of nonaffine displacement and the spatial extent of its correlation domain using the developed model.

Conclusions:

  • The presented optical method offers a sensitive approach to experimentally probe nonaffine deformation in amorphous materials.
  • This technique facilitates the study of nonaffinity in the elastic regime, which is challenging due to its subtle nature.
  • The findings contribute to a better understanding of the mechanical behavior of disordered materials and their response to stress.