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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Supershear Rayleigh waves at a soft interface.

Anne Le Goff1, Pablo Cobelli2, Guillaume Lagubeau3

  • 1Microfluidique, MEMs et Nanostructures, UMR Gulliver 7083, ESPCI, 75005 Paris, France.

Physical Review Letters
|August 29, 2014
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Summary
This summary is machine-generated.

Researchers experimentally observed supershear Rayleigh waves on liquid foam surfaces, which travel faster than bulk shear waves. This finding confirms the existence of these debated waves in a model viscoelastic system.

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Area of Science:

  • Rheology
  • Surface Physics
  • Wave Propagation

Background:

  • The existence of surface waves propagating faster than bulk shear waves (supershear waves) has been a long-standing debate.
  • Recent geophysical observations of supershear events motivated the search for these phenomena in model systems.

Purpose of the Study:

  • To experimentally investigate the existence of supershear surface waves on a liquid foam.
  • To characterize the behavior of waves generated by projectile impact on a viscoelastic foam surface.

Main Methods:

  • Utilized an optimized fast profilometry technique to observe surface wave dynamics.
  • Triggered waves on a liquid foam surface using projectile impact at varying velocities.

Main Results:

  • Observed surface waves propagating faster than bulk shear waves at high impact velocities.
  • Identified these faster waves as supershear Rayleigh waves, accompanying expected subshear Rayleigh waves.

Conclusions:

  • Experimental evidence confirms the existence of supershear Rayleigh waves on liquid foam surfaces.
  • Liquid foams serve as a viable model system for studying supershear wave phenomena.