Rheology pp 199-204 | Cite as

Non-Newtonian Viscosity at High Stresses

  • A. Eastwood
  • G. Harrison


It has long been established that in polymer melts and solutions the viscosity is a non-linear function of shear rate, the value falling from the ‘Newtonian’ or low-shear-rate limiting value as the shear rate is increased. Attempts to observe directly the non-Newtonian behaviour of simple liquids and lubricants in continuous shear at room temperature have met with little success, however, due principly to the considerable heat generated even in a very thin fluid film at the high shear rates required. Non-Newtonian effects have been observed in oil films under elastohydrodynamic conditions, where the fluid is subject to high pressures, and it has been deduced that these effects occur above a critical shear-stress level of between 1 and 100 MPa, depending on the pressure and the molecular weight of the liquid (Hirst and Moore, 1978).


Shear Stress Shear Rate Glass Transition Temperature Apparent Viscosity High Shear Rate 
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  3. Gray, R.W., Harrison, G. and Lamb, J., 1977. Proc.Roy.Soc.Lond. A356: 77–102.ADSGoogle Scholar
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  5. Plazek, D.J., 1968, J.Polymer Sci. A-2, 6: 621–638.Google Scholar

Copyright information

© Springer Science+Business Media New York 1980

Authors and Affiliations

  • A. Eastwood
    • 1
  • G. Harrison
    • 1
  1. 1.Department of ‘Electronics and Electrical EngineeringGlasgow UniversityGlasgowScotland

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