3—The Propagation of Longitudinal Stress Pulses in Textile Fibres—Part 1

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Abstract
A knowledge of the elastic properties of textile fibres, measured under dynamic conditions, is becoming of increasing importance for the elucidation of their visco-elastic properties and rheological behaviour. A study of previous work on the subject, however, reveals serious gaps in present knowledge, particularly in regard to measurements on single fibres at frequencies greater than about 20 kc/s ; also, determinations of the dynamic and static elastic moduli of the same samples, over a range of materials, are lacking. The present contribution describes in Part I an experimental method for the determination of Young's modulus for single textile fibres at a frequency of 100 kc/s, using a direct pulse-velocity method of measurement , and compares in Part II some values of dynamic elastic modulus obtained in this way with the static values measured on the same specimens, for a limited range of textile materials. The significance of the results as they affect the interpretation of the rheological characteristics of the fibres is briefly discussed.

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