Determination of the viscoelastic properties of synthetic yarns on the basis of short-term testing

Conclusions A method has been developed for determining the deformation characteristics of polycaproamide yarns, which differs from the previously known ones by allowing for relaxation contributions in loading the specimen.The parameters obtained by the indicated method permit one to calculate a family of relaxation curves at a deformation up to 25–30% of the breaking value, relaxation times up to 10³ sec, and with an error which does not exceed experimental error.Stretching diagrams and stress relaxation curves at long relaxation times can be calculated with an accuracy sufficient for engineering calculations.Translated from Khimicheskie Volokna, No. 2, pp. 24–25, March–April, 1988.