Uniaxial tensile viscoelastic and viscoplastic behaviour of Nylon 12 at constant strain rate

Tensile tests with constant crosshead speeds ranging from 5 to 200 mm min⁻¹ were performed on Nylon 12 in the temperature range, 25 to 140°C. A modified form of the constitutive equations derived by Drozdov and Yuan were used to describe the time dependant response of Nylon 12 at isothermal deformation and small strains. Reasonable agreement was observed between the experimental data and the numerical calculations. A relationship between the materials constants derived for the uniaxial stress strain behaviour and temperature was found to exist. This is shown to satisfactorily calculate the constants required to accurately predict the stress strain behaviour of Nylon 12 at a specific strain rate and temperature.