Abstract
Simultaneous measurements of the longitudinal extension and the lateral contraction strains in tension specimens made from a pure epoxy polymer by using the differential moire method yielded the extension creep compliance and relaxation modulus master curves along the whole viscoelastic spectrum of the material. Moreover, they provided the lateral contraction ratio curves in creep and relaxation. Both pairs of curves determine completely the viscoelastic behavior of the polymeric substances. It was shown that the transient lateral contraction ratio functions are monotonically increasing functions with time and temperature and the creep function is lagging in time with respect to the corresponding relaxation function.
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