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Prediction of creep of nylon-6,6 at constant stress, temperature and moisture content

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
20
Issue
2
Identifiers
DOI: 10.1016/0032-3861(79)90228-3

Abstract

Abstract A method is described of accurately superposing creep curves, obtained at different relative humidities, that each covered six decades of time. The superposition required an empirical distortion of the logarithmic-time scale; for which the justification was that it not only gave more accurate superposition, but also that the same distortion could be successfully used for five relative humidities and three stresses and needed the same horizontal shift factor for all stresses except at the highest relative humidity, of 90%. Equations were fitted to the resulting master curves and non-linearity correction factors, enabling the computer to predict creep curves at any constant stress up to 12 MN/m 2 and at any constant humidity up to 90% r.h. No attempt has been made to explain the success of the distortion used, but its usefulness is readily apparent.

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