Nonlinear rheology of a highly supercooled liquid
Department of Physics, Kyoto University, Kyoto 606-01, Japan
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