Abstract
Distributions of both stress and rate of strain in a sample while rotating the rotor of a conventional Mooney viscometer were schematically illustratrated for a power low fluid.
Two characteristic methods of averaging the stress and the rate of strain in a sample were given in detail, namely the torque-averaged stress method and the dissipation energy-averaged rate of strain method.
The experimental data obtained by those two methods on SBR 1500 were then compared at various rates of strain with those on the same sample by a Piper-Scott type viscometer and also a concentric cylinder rotational viscometer. The results showed that either averaging method can be used fairly well to obtain quantitative data on the shear rate dependence of the apparent viscosity in raw rubbers.
