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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Plastic strain rate quantified from dislocation dynamics in dusty plasma shear flows.

Shaoyu Lu1, Dong Huang1, Yan Feng1

  • 1Center for Soft Condensed Matter Physics and Interdisciplinary Research, College of Physical Science and Technology, Soochow University, Suzhou 215006, China.

Physical Review. E
|July 17, 2021
PubMed
Summary

The Orowan equation accurately measures plastic strain rate in 2D dusty plasmas at lower shear rates. At higher rates, dislocation dynamics shift, deviating from the equation in liquidlike flows.

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Area of Science:

  • Plasma Physics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Investigating defect and dislocation dynamics is crucial for understanding material behavior under stress.
  • Dusty plasmas offer a unique experimental system to study these dynamics in a controlled manner.

Purpose of the Study:

  • To investigate the dynamics of dislocations and defects in 2D dusty plasmas subjected to counterpropagating flows.
  • To assess the applicability of the Orowan equation in determining plastic strain rate under varying shear rates.
  • To analyze the distinct stages of dislocation motion and defect dynamics in sheared dusty plasmas.

Main Methods:

  • Experimental investigation using 2D dusty plasma with two counterpropagating flows.
  • Application of the Orowan equation to calculate plastic strain rate from dislocation motion.
  • Analysis of shear rate using drift velocity gradients.
  • Langevin dynamical simulations to verify experimental findings across various shear rates.

Main Results:

  • The Orowan equation accurately determines plastic strain rate from dislocation motion at lower shear rates, aligning with shear rate definitions.
  • At higher shear rates, the system transitions to a liquidlike flow state, causing the Orowan equation's determined shear rate to deviate.
  • Dislocation motion is categorized into local and gliding types, as evidenced by probability distribution functions.
  • Langevin simulations confirm experimental observations, revealing two distinct stages in defect and dislocation dynamics with increasing shear rate.

Conclusions:

  • The Orowan equation is a valid tool for quantifying plastic strain rate in 2D dusty plasmas within certain shear rate limits.
  • Sheared dusty plasmas exhibit complex dislocation and defect dynamics that evolve in distinct stages with increasing shear rate.
  • The transition to a liquidlike state at higher shear rates significantly impacts the applicability of traditional models like the Orowan equation.