Abstract
To make twist proportional to length, corrections must be applied to the free specimen length between the clamps. These corrections are determined experimentally by clamping a specimen of polymeric material over various lengths and extrapolating the torsion angle to zero length.For cylinders with ring-shaped clamps, a two-sided correction was found of 0·235 of the diameter.For rectangular specimens with flat-plate clamping at the ends, the correction varies between 0·20 (square cross section) and −0·55 (very slender cross section) of the greatest width.Results only partly correspond with theoretical predictions, since theoretical and experimental conditions are not identical.
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