Abstract
DURING the course of studying the strain-rate effects of a number of irradiated and non-irradiated polymeric solids as well as some metallic solids (refs. 1 and 2 and unpublished results) a common relationship between stress and strain-rate has been observed. For any given value of strain the stress obtained at different rates of straining is linearly related with the logarithm of the strain-rate. Mathematically, if ɛ is the total given strain at any given temperature T, then the stress σ is related with the strain-rate ε̇ in the following manner : 
where ε̇0 and σ0 are constants independent of the strain ɛ, and m, which is also independent of the strain, is the slope of the straight line when the log of strain-rate is plotted against the stress. Or in another form, when the rate of straining is constant : 
Depending upon the value of ɛ, which is a measure of molecular configuration of the solid in terms of deformation3, the time-dependent strength can be evaluated.
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HSIAO, C. Time-Dependent Tensile Strength of Solids. Nature 186, 535–537 (1960). https://doi.org/10.1038/186535b0
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DOI: https://doi.org/10.1038/186535b0
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