Abstract
Nylon yarn at constant temperature was exposed to changes in relative humidity. It was found that, at constant length, the tension in the yarn is inversely proportional to the logarithm of the relative humidity; at constant tension, the logarithm of the length is proportional to the relative humidity. At low strains, stress is proportional to strain. Then over a limited range a linear relation exists between log stress and log strain. "Equations of state" were derived relating these variables, and the constants therein were evaluated for a nylon textile yarn. Different equations apply in different regions of the stress-strain curve. A similar equation was derived for the case of vary ing temperature, but the constants were not evaluated.
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