Enhancement of structural rearrangement in glassy systems under shear flow
Unità di Salerno and Dipartimento di Fisica, Università di Salerno
84081 Baronissi (Salerno), Italy
2 INFM, Unità di Bari and Dipartimento di Fisica, Università di Bari and INFN, Sezione di Bari - via Amendola 173, 70126 Bari, Italy
Accepted: 12 September 2000
We extend the analysis of the mean field schematic model recently introduced (see Corberi F., Nicodemi M., Piccioni M. and Coniglio A. Phys. Rev. Lett., 83 (1999) 5054) for the description of glass forming liquids to the case of a supercooled fluid subjected to a shear flow of rate γ. After quenching the system to a low temperature T, a slow glassy regime is observed before stationarity is achieved at the characteristic time . is of the order of the usual equilibration time without shear for weak shear, . For larger shear, , local rearrangement of dense regions is instead enhanced by the flow, and .
PACS: 64.70.Pf – Glass transitions / 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 83.50.Ax – Steady shear flows
© EDP Sciences, 2000