Stress fluctuations, static yield stress, and shear banding in a flowing Lennard-Jones glass

Fathollah Varnik; Lyderic Bocquet; Jean-Louis Barrat

doi:10.1117/12.547278

25 May 2004 Stress fluctuations, static yield stress, and shear banding in a flowing Lennard-Jones glass

Fathollah Varnik, Lyderic Bocquet, Jean-Louis Barrat

Proceedings Volume 5469, Fluctuations and Noise in Materials; (2004) https://doi.org/10.1117/12.547278
Event: Second International Symposium on Fluctuations and Noise, 2004, Maspalomas, Gran Canaria Island, Spain

Abstract

Using large scale molecular dynamics simulations, we study the non-linear rheology of a model glass (a 80:20 binary Lennard-Jones mixture). In a glassy state, this model exhibits shear banding at low imposed shear rates. This behavior seems to be closely related to the existence of a static yield stress, σ_y, and to the observation that, under imposed shear rate, σ(γ→0) < σ_y. We measure the static yield stress via simulations under imposed stress and investigate its dependence on temperature. For temperatures far below T_c (the mode coupling critical temperature of the model), σ_y hardly decreases upon heating whereas it changes much faster as T_c is approached. Furthermore, at extremely low shear rates, large stress fluctuations are observed which is reminiscent of the stick-slip motion observed in friction simulations. Our results, which open the possibility of exploring complex rheological behavior using simulations, are compared to recent experiments on various soft glasses.

Citation Download Citation

Fathollah Varnik, Lyderic Bocquet, and Jean-Louis Barrat "Stress fluctuations, static yield stress, and shear banding in a flowing Lennard-Jones glass", Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); https://doi.org/10.1117/12.547278

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