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Creep in colloidal glasses.

M Siebenbürger1, M Ballauff, Th Voigtmann

  • 1Helmholtz-Zentrum für Materialien und Energie, 14109 Berlin, Germany.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

This study reveals distinct responses of colloidal glasses to shear stress, linking soft and hard matter deformation. A generalized Maxwell model explains logarithmic creep and critical yield stress, highlighting aging effects.

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Area of Science:

  • Soft matter physics
  • Materials science
  • Rheology

Background:

  • Colloidal hard-sphere glasses exhibit complex rheological behavior.
  • Understanding the nonlinear response to shear stress is crucial for material design.
  • Connections between soft and hard matter deformation under stress are not fully elucidated.

Purpose of the Study:

  • To investigate the nonlinear response to shear stress in colloidal hard-sphere glasses.
  • To identify different response regimes based on time, sample age, and stress magnitude.
  • To establish a link between stress-imposed deformation in soft (colloidal) and hard (metallic) matter.

Main Methods:

  • Experimental investigation of colloidal hard-sphere glass under shear stress.
  • Analysis of stress-strain curves and time-dependent deformation.
  • Application of a generalized Maxwell model for theoretical interpretation.

Main Results:

  • Identified distinct nonlinear response regimes dependent on time, sample age, and stress magnitude.
  • Observed logarithmic creep at long times and low stresses, rationalized by a generalized Maxwell model.
  • Detected diverging time scales near a critical yield stress and significant aging effects at intermediate times, including stress overshoots.

Conclusions:

  • The study highlights a connection between stress-imposed deformation in soft and hard matter systems.
  • A generalized Maxwell model effectively describes the observed creep and yield behavior.
  • Aging effects play a significant role in the intermediate-time response of colloidal glasses to shear stress.