Abstract
THE retarded elastic extension of a high polymer under load can be represented by a series of Voigt elements, each consisting of a spring and dashpot in parallel. With each element is associated a retardation time, and a series of Voigt elements therefore gives rise to a spectrum of retardation times. This spectrum can be obtained from a creep curve by a method due to Alfrey1. In his method the extension is plotted against log-time, and the slope of this curve when plotted against log–time gives a close approximation to the spectrum.
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References
Alfrey, T., “Mechanical Behaviour of High Polymers”, 556 (Interscience Pub., 1948).
Weichert, E., Ann. phys. Chem., 50, 335 (1893).
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ELLEMAN, A. A Graphical Method of analysing Creep Curves. Nature 174, 138–139 (1954). https://doi.org/10.1038/174138b0
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DOI: https://doi.org/10.1038/174138b0
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