The Determination of Dynamic Moduli and Internal Friction of High Polymers from Creep Measurements

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Abstract
An account is given of the use of Fourier analysis to transform creep measurements to dynamic quantities with specific reference to some measurements made on polythene. The method is based on a technique described by Roesler, but additional theory is given which eliminates the necessity of determining the retardation spectrum explicitly. Using the derived dynamic quantities as a standard it is shown that more approximate methods provide sufficiently accurate transformations for many practical purposes if the retardation spectrum of the material is very flat.