Abstract
Tensile load-extension diagrams have been obtained for low- and high-density polyethylene and teflon. Conventional notions concerning the effect of strain rate on the properties of solids are found not to apply. The unconventional distribution of the family of δ-e curves plotted for different strain rates is caused by the combination of high-elastic and plastic deformation associated with the extension of crystalline polymers. An attempt is made to correlate the data on a narrow range of strain rates with the aid of a model of a viscoelastic solid with variable relaxation time, and on a broader range by means of an equation incorporating the limiting dynamic diagram.
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