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How fast can cracks propagate?

Abraham1, Gao

  • 1IBM Research Division, Almaden Research Center, San Jose, California 95120, USA.

Physical Review Letters
|October 6, 2000
PubMed
Summary
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Atomic simulations reveal that cracks can exceed the Rayleigh wave speed. A shear-dominated crack can accelerate and generate a faster, intersonic daughter crack, challenging previous beliefs.

Area of Science:

  • Materials Science
  • Solid Mechanics
  • Computational Physics

Background:

  • Crack propagation dynamics are crucial for understanding material failure.
  • Previous theories suggested cracks are limited by the Rayleigh wave speed.

Purpose of the Study:

  • To investigate crack propagation at the atomic scale.
  • To determine the maximum speed of crack propagation along a weak interface.

Main Methods:

  • Atomic simulations were employed.
  • Simulations focused on a mode II shear-dominated crack in harmonic crystals.

Main Results:

  • The crack accelerated to the Rayleigh wave speed.
  • An intersonic daughter crack, traveling at longitudinal wave speed, was nucleated.

Related Experiment Videos

  • Observed crack speeds exceeded the previously accepted limit.

    • Conclusions:

    • Crack propagation can surpass the Rayleigh wave speed.
    • Atomic simulations provide new insights into fracture mechanics.
    • The findings challenge established theories in solid mechanics.