What is the maximum reachable Hencky strain with the SER?
A. One complete drum rotation corresponds to a Hencky strain of 5, however, beyond a Hencky strain of about 4 the sample begins to overwrap the securing clamps and the previously wound sample. With proper care, the SER can be operated well beyond a single drum rotation with little to no problem for molten polymers with large extensability. If the polymer does survive to such strains, sample overwrapping typically does not affect the torque signal by an appreciable degree and is usually observed as a brief perturbation in the torque signal as the sample overwraps the securing clamps. Usually by this point either the polymer has reached its plateau viscosity or the sample has already initiated its failure mode. At high rates (>1 s-1), most melts will rupture prior to sample overwrap.
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