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Abstract

Amorphous materials such as dense suspensions of polydisperse hard sphere colloidal particles and metallic glasses exhibit a rich phenomenology when exposed to a simple shear such as a planar Couette flow. In these systems, the flow may become heterogeneous despite the fact that the macroscopic stress is constant across the system [1,2]. However, both in computer simulations [1,3] and experiments [2] the observed velocity profile is unsteady with significant spatio-temporal fluctuations. This talk addresses this issue both via simulations as well via as analysis of the underlying hydrodynamic equations [3].

[1] F. Varnik, L. Bocquet, J.-L. Barrat, L. Berthier, Phys. Rev. Lett. 90, 095702 (2003) .
[2] R. Besseling, L. Isa, P. Ballesta, G. Petekidis, M.E. Cates, W.C.K. Poon, Phys. Rev. Lett. 105, 268301 (2010).
[3] S. Mandal, M. Gross, D. Raabe, F. Varnik, Phys. Rev. Lett. 108, 098301 (2012).