Abstract
AbstractThe relative rates of relaxation and creep in shear, elongation, and isotropic compression are discussed in terms of the theory of linear viscoelasticity. Exact expressions are given for the creep rates; for the relaxation rates approximations are found which are useful in the glassy range where the amount of relaxation is small. Among the results of interest is the relation: valid if d In B/d In t is less than d In J/d In t as is intuitively expected and experimentally found. Here J(t), E(t), and B(t) are the shear, tensile, and bulk creep compliances, respectively. For polymers in the rubbery and flow regions, (d In J/d In t)/(d In D/d In t) is very close to 1(usually within 0.01%); in the glassy region, it is unlikely to be greater than 1.2.
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