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Oscillations in rapid fracture.

Ariel Livne1, Oded Ben-David, Jay Fineberg

  • 1The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Physical Review Letters
|May 16, 2007
PubMed
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Researchers discovered a new dynamic oscillatory instability in brittle gels during tensile fracture. This instability emerges at a critical velocity (VC), challenging existing fracture mechanics models at high speeds.

Area of Science:

  • Materials Science
  • Fracture Mechanics
  • Soft Matter Physics

Background:

  • Linear elastic fracture mechanics (LEFM) traditionally describes crack propagation.
  • Microbranching instability typically limits crack speeds in brittle materials.
  • Understanding fracture dynamics in soft materials like gels is crucial.

Purpose of the Study:

  • To investigate the dynamics of pure tensile fracture in thin brittle gels.
  • To identify and characterize novel instabilities in crack propagation.
  • To determine the conditions under which crack dynamics deviate from LEFM.

Main Methods:

  • Experiments involving pure tensile fracture of thin brittle gel samples.
  • Controlled fracture experiments to achieve crack velocities near the shear wave speed (CS).

Related Experiment Videos

  • Observation and analysis of crack propagation patterns and dynamics.

    • Main Results:

    • A new dynamic oscillatory instability was observed in pure tensile fracture.
    • The instability onset occurs at a critical velocity, VC = 0.87 CS.
    • Sinusoidal oscillations with a wavelength independent of sample dimensions were detected, suggesting microscopic origins.

    Conclusions:

    • Crack dynamics in brittle gels exhibit a novel oscillatory instability at high velocities.
    • This instability emerges when microbranching is suppressed, allowing speeds approaching VC.
    • The observed macroscopic oscillations likely stem from an intrinsic microscopic scale, independent of LEFM.