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Abaqus Unified FEA
POLYFLOW Blow Molding
DMA Cone and Plate Steady Shear Rheology (1 Temperature)
A dynamic mechanical analyzer is used. A test specimen in the form of a circular disk is sandwiched between the cone and plate of the apparatus, at temperature. The cone is rotated with respect to the plate at a constant shear rate and the torque transmitted through the specimen is measured. This is used to calculate the shear viscosity.
Samples in powder, fluid or pellet forms can also be used.
Shear Viscosity v. Shear Rate are reported. This data appears in
Melt Rheology by DMA
(# of times this test is repeated)
2 - plate rheology discs
Such viscosity data is useful for the determination of low shear viscosity. It provides a good determination of the zero shear viscosity, a measure that correlates strongly to molecular weight. It is also useful for characterizing processes, such as rotational molding, where very low shear rates are observed.