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A nonlinear viscoelastic theory is proposed to model the creep behaviour of an unsaturated polyester resin. The theory is based on Schapery's single-integral model, modified by an exponential kernel function. Further Struik's theory of physical ageing has been included to describe long-term behaviour. A series of tests has been carried out in order to characterize the model parameters and verify the...
In the first part of this paper, a uniaxial nonlinear viscoelastic model has been established to describe the long-term creep behaviour of an unsaturated polyester resin. The model was based on Schapery's thermodynamics-based theory, and included effects of physical ageing. In the present (second) part, this model is extended into a general three-dimensional form. In the 3D-model a creep contraction...
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