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Related Experiment Video

Updated: May 18, 2026

Intermediate Strain Rate Material Characterization with Digital Image Correlation

Intermediate Strain Rate Material Characterization with Digital Image Correlation

Published on: March 1, 2019

Glass dynamics at high strain rates.

J S Langer¹, Takeshi Egami

¹Department of Physics, University of California, Santa Barbara, California 93106-9530, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 26, 2012

Summary

Shear-transformation-zone (STZ) theory accurately models rapidly sheared metallic glasses, primarily driven by effective-temperature thermodynamics. A multispecies STZ generalization resolves discrepancies observed near the glass transition temperature.

Area of Science:

Materials Science
Condensed Matter Physics
Computational Materials Science

Background:

Metallic glasses exhibit complex behavior under shear, particularly at high strain rates.
Understanding the relationship between simulation data and theoretical models is crucial for predicting material properties.

Purpose of the Study:

To analyze molecular-dynamics simulations of sheared metallic glasses using shear-transformation-zone (STZ) theory.
To investigate the influence of temperature and strain rate on the mechanical behavior of metallic glasses.

Main Methods:

Application of a simplified shear-transformation-zone (STZ) theoretical framework.
Analysis of molecular-dynamics simulation data spanning a wide temperature range.
Utilizing scaling transformations to analyze simulation results.

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Last Updated: May 18, 2026

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Main Results:

The simplified STZ theory largely reproduces simulation data, showing approximate data collapse via scaling.
Effective-temperature thermodynamics predominantly governs behavior at high strain rates.
A discrepancy arises at lower strain rates near the glass transition temperature.

Conclusions:

The study validates the applicability of STZ theory to sheared metallic glasses under specific conditions.
Effective temperature is a key factor in high-strain-rate behavior.
A generalized multispecies STZ theory is proposed to resolve simulation-theory discrepancies, aligning with findings in viscoelasticity and relaxation phenomena.