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Instabilities of High Speed Dislocations.

J Verschueren1, B Gurrutxaga-Lerma2,3, D S Balint4

  • 1Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom.

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|October 20, 2018
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Summary
This summary is machine-generated.

Scientists discovered a new mechanism for dislocation generation at high speeds using atomistic simulations. This finding helps explain phenomena like dynamic fracture and shock loading, even though supersonic dislocation motion is still possible.

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Area of Science:

  • Solid mechanics
  • Materials science
  • Computational physics

Background:

  • Understanding dislocation motion at high velocities is crucial for materials science.
  • Previous models have not fully explained the physical mechanisms behind dislocation generation.

Purpose of the Study:

  • To elucidate the physical picture of dislocations moving at high velocities.
  • To investigate the atomistic mechanisms underlying dislocation generation.

Main Methods:

  • Utilized two complementary atomistic methods: lattice dynamics and molecular dynamics.
  • Modeled uniformly moving screw dislocations to identify mechanical instabilities.

Main Results:

  • Identified material-dependent mechanical instabilities at velocities below the speed of sound.
  • Demonstrated these instabilities initiate an atomistic kinematic generation mechanism.
  • Observed a homogeneous nucleation mechanism leading to an avalanche of dislocations.

Conclusions:

  • The discovered mechanism explains previously observed but unexplained dislocation generation.
  • This mechanism is relevant to high strain rate phenomena such as adiabatic shear banding, dynamic fracture, and shock loading.
  • Supersonic dislocation motion is not precluded by these instabilities.