Complex Oscillatory Yielding of Model Hard-Sphere Glasses

N. Koumakis, J. F. Brady, and G. Petekidis
Phys. Rev. Lett. 110, 178301 – Published 23 April 2013
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Abstract

The yielding behavior of hard sphere glasses under large-amplitude oscillatory shear has been studied by probing the interplay of Brownian motion and shear-induced diffusion at varying oscillation frequencies. Stress, structure and dynamics are followed by experimental rheology and Browian dynamics simulations. Brownian-motion-assisted cage escape dominates at low frequencies while escape through shear-induced collisions at high ones, both related with a yielding peak in G. At intermediate frequencies a novel, for hard sphere glasses, double peak in G is revealed reflecting both mechanisms. At high frequencies and strain amplitudes a persistent structural anisotropy causes a stress drop within the cycle after strain reversal, while higher stress harmonics are minimized at certain strain amplitudes indicating an apparent harmonic response.

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  • Received 1 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.178301

© 2013 American Physical Society

Authors & Affiliations

N. Koumakis1, J. F. Brady2, and G. Petekidis1,*

  • 1FORTH/IESL and Department of Materials Science and Technology, University of Crete, 71110 Heraklion, Greece
  • 2Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA

  • *Corresponding author. georgp@iesl.forth.gr

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Issue

Vol. 110, Iss. 17 — 26 April 2013

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