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Related Experiment Videos

Microstructural shear localization in plastic deformation of amorphous solids.

J S Langer1

  • 1Physics Department, Broida Hall, University of California, Santa Barbara, California 93106, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 20, 2001
PubMed
Summary

Soft, noncrystalline solids may form shear bands due to instability, explaining strain softening in experiments. This shear-transformation-zone (STZ) theory aligns with experimental data, even in simplified models.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Condensed Matter Physics

Background:

  • Plastic deformation in noncrystalline solids is complex.
  • Shear-transformation-zone (STZ) theory offers a framework for understanding this behavior.
  • Microstructural instabilities, like shear banding, are observed experimentally.

Purpose of the Study:

  • To investigate the role of STZ theory in predicting shear band formation.
  • To explore the mechanism of strain softening in soft, noncrystalline solids.
  • To analyze the conditions leading to microstructural instabilities and shear banding.

Main Methods:

  • Limited nonlinear analysis of STZ theory.
  • Focus on one-dimensional banding patterns in two-dimensional systems.

Related Experiment Videos

  • Consideration of low-temperature conditions and a simplified STZ model.

    • Main Results:

    • The STZ theory predicts linear instability leading to periodic shear bands in soft solids.
    • This instability is a likely cause of strain softening in experiments.
    • The nonlinear theory suggests isolated shear bands can form in harder materials under stress concentration.

    Conclusions:

    • The STZ theory provides a qualitative explanation for observed shear banding and strain softening.
    • The model's predictions align with key experimental findings.
    • The theory offers insights into shear band formation in both soft and harder materials.