Abstract
The present study evaluates the mechanical characteristic of polybutylene terephthalate based on nonlinear viscoelasticity and non-isochoric viscoplasticity by creep recovery test and uniaxial test. A series-connected model of Schapery nonlinear viscoelasticity and Perzyna viscoplasticity is used to express the mechanical behavior. The nonlinear viscoelastic parameters and the viscoplastic parameters are identified by creep recovery test and by uniaxial tensile test, respectively. As the results, the mechanical behavior in creep recovery test and uniaxial tensile test can be reproduced by using the series-connected model. However, the identified initial yield stress is larger than the loading stress in creep recovery test. This fact means that further consideration is needed the viscoplastic model with physically meaningful parameters.
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