Abstract
In order to investigate viscoelastic-plastic properties and discuss a constitutive equation at finite strains in polymer solids, uniaxial compression tests were executed at different temperatures using polypropylen (PP) rods under conditions of constant strain rate, abrupt change of strain rate, stress relaxation, creep loadings and their combination. Several viscoelastic-plastic properties which must be taken into account in the constitutive equation of PP are pointed out, and the experimental data are compared with the numerical results based on the concept of an over stress model. It is found that the model describes the stress-strain behaviours of PP well in the case where the current strain is not below the previous one.
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