The close relationship between processing conditions and mechanical properties was observed in amorphous and semi-crystalline
polymers (Schmidt, Opfermann et al. 1981). In in-
jection moulding the thermal and mechanical phenomena are strongly coupled. This thermomechanical environment is characterized by high-temperature gradients and stress levels and their local variations in the space domain of the moulding (Viana, Billon et al. 2004).