Clamping corrections for torsional stiffness of prismatic bars

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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 0235 of the diameter. For rectangular specimens with flat-plate clamping at the ends, the correction varies between 020 (square cross section) and −055 (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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