期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.178301
关键词
-
资金
- EU [CPCSA-2010-262348]
- Greek Thales Project COVISCO
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. DOI: 10.1103/PhysRevLett.110.178301
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