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Dynamic instability in intergranular fracture.

V Yamakov1, E Saether, D R Phillips

  • 1National Institute of Aerospace, Hampton, Virginia 23666, USA. yamakov@nianet.org

Physical Review Letters
|August 11, 2005
PubMed
Summary
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Dynamic instabilities in aluminum grain boundaries cause periodic dislocation bursts, not crack branching. These bursts limit crack speed and enhance grain boundary toughness.

Area of Science:

  • Materials Science
  • Solid Mechanics
  • Computational Physics

Background:

  • Crack propagation in materials is crucial for understanding material failure.
  • Dynamic instabilities can significantly alter crack behavior and material properties.
  • Grain boundaries are common defects that influence crack path and fracture toughness.

Purpose of the Study:

  • To investigate dynamic instabilities during steady-state crack propagation along aluminum grain boundaries.
  • To characterize the behavior of intergranular cracks when approaching a critical speed.
  • To understand the mechanisms behind crack arrest and toughness enhancement at grain boundaries.

Main Methods:

  • Utilized a molecular-dynamics model to simulate crack propagation under steady-state conditions.

Related Experiment Videos

  • Analyzed crack behavior in aluminum, focusing on intergranular fracture.
  • Investigated crack speeds relative to the material's Rayleigh wave speed.

    • Main Results:

    • Observed dynamic instabilities when crack speed reached approximately one-third of the Rayleigh wave speed.
    • Instead of branching, intergranular cracks exhibited periodic dislocation bursts.
    • These bursts led to crack speed oscillations and increased energy dissipation.

    Conclusions:

    • Dynamic instabilities at grain boundaries manifest as dislocation bursts, not crack branching.
    • Dislocation bursts effectively limit crack propagation speed and increase energy dissipation.
    • Intergranular crack propagation with dynamic instabilities enhances grain boundary toughness.