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Abaqus Unified FEA
POLYFLOW Blow Molding
First Normal Stress Difference by DMA (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 and the normal force is measured. This is used to calculate the viscosity, first normal stress difference.
Samples in powder, fluid or pellet forms can also be used. Tests can be performed at more temperatures for additional cost.
First Normal Stress Difference v. Shear Rate are reported. The shear viscosity data can also be supplied. This data appears in
Melt Rheology by DMA
(# of times this test is repeated)
2 - plate rheology discs
These properties are fundamental viscometric measures of polymers and can be used in the development of visco-elastic models for applications including extrusion and blow molding simulation.