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Intermediate Strain Rate Material Characterization with Digital Image Correlation
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Strain rate dependency of dislocation plasticity.

Haidong Fan1,2, Qingyuan Wang3, Jaafar A El-Awady4

  • 1Department of Mechanics, Sichuan University, Chengdu, China. hfan85@scu.edu.cn.

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|March 24, 2021
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Summary
This summary is machine-generated.

This study reveals how metal strength depends on dislocation density and strain rate, proposing a universal scaling function that captures complex hardening behaviors in copper and aluminum.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

Background:

  • Dislocation glide is a fundamental deformation mechanism controlling the mechanical strength of metals.
  • Understanding the interplay between strain rate, dislocation density, and material strength is crucial for predicting metal behavior under stress.

Purpose of the Study:

  • To investigate the strain rate and dislocation density dependence of the strength in bulk copper and aluminum single crystals.
  • To establish an analytical relationship linking material strength, dislocation density, strain rate, and dislocation mobility.
  • To develop a unified framework for understanding plastic deformation and hardening phenomena.

Main Methods:

  • Utilizing discrete dislocation dynamics (DDD) simulations.
  • Employing molecular dynamics (MD) simulations.
  • Comparing simulation results with published experimental data.

Main Results:

  • Material strength exhibits a transition from strain rate hardening to classical forest hardening as dislocation density increases.
  • Observed a strain rate-independent regime followed by a strain rate hardening regime with increasing strain rate.
  • Developed a single scaling function relating scaled strength to a coupling parameter (dislocation density and strain rate).

Conclusions:

  • The proposed analytical relationship accurately predicts simulation and experimental results.
  • The coupling parameter effectively governs plasticity localization, dislocation flow fluctuations, and velocity distributions.
  • A unified understanding of metal strength dependence on microstructural and dynamic parameters is achieved.