| Issue |
Europhys. Lett.
Volume 40, Number 1, October 1997
|
|
|---|---|---|
| Page(s) | 61 - 66 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00419-1 | |
| Published online | 01 September 2002 | |
Nonlinear rheology of a highly supercooled liquid
Department of Physics, Kyoto University, Kyoto 606-01, Japan
Received:
25
May
1997
Accepted:
29
August
1997
We numerically examine
nonlinear rheology of a highly supercooled two-di men sional fluid
in shear flow via molecular-dynamics simulation.
The viscosity exhibits marked shear-thinning behavior when
the shear rate 
exceeds the inverse of the α
relaxation time 
.
Bond breakage events among particle pairs are found to occur
collectively in clusters.
The characteristic size ξ of such clusters
grows strongly with lowering the temperature
and decreases rapidly with increasing
as 
. Here
is the bond breakage rate
tending to
for 
and growing as for 
.
The viscosity is of order 
in glassy states.
PACS: 64.70.Pf – Glass transitions / 83.50.Gd – Nonlinear viscoelasticity / 61.20.Lc – Structure of liquids: Time-dependent properties; relaxation
© EDP Sciences, 1997
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