AbstractA constitutive equation is derived for stress‐relaxation in isotropic incompressible viscoelastic solids at small constant deformations. This is used to calculate the torque and tensile force necessary to maintain simultaneous torsion and simple extension in a straight circular tube. Measurements are made of the dependence of the tensile force and torque on the amount of torsion and fractional extension in tubes of filled high‐polymers. It is shown that by means of the theory the results of certain of the experiments can be predicted from oth
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