Abstract
A description is given of the equipment and measurement techniques which have been developed for the determination of the dynamic elastic modulus of staple fibers of length 25 mm or less. The dynamic elastic modulus, often called the sonic modulus, is determined by means of the pulse propagation method with the aid of a specially designed constant fiber-strain device. The modulus values are obtained for different fiber strain levels and are used to construct the dynamic stress–strain curve of the fibers. Results obtained for cotton, jute, and wool fibers are presented and discussed. In general, two points of inflexion on the constructed fiber stress–strain curves are determined without ambiguity, by the maximum and minimum values of the fiber dynamic modulus. The region between these two inflexion points is interpreted as the yield region of the fiber.
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