An Anisotropic Modeling of the Visco-hyperelastic Behaviour of PET under ISBM Process Conditions
Résumé
The mechanical behaviour of Polyethylene Terephthalate (PET) under the severe loading conditions of the injection stretch blow moulding (ISBM) process is strongly dependent on strain rate, strain and temperature. In this process, the PET near the glass transition temperature (Tg) shows a strongly non linear elastic and viscous behaviour. In author's previous works, a non linear visco-hyperelastic model has been identified from equi-biaxial tension experimental results. In this work, the proposed non linear visco-hyperelastic model is implemented into the Abaqus environment and used to model the equal-biaxial tension tests. Despite the good agreement with biaxial test results, the model fails to reproduce the shape evolution during the free blowing of preforms. An anisotropic version of this visco-hyperelastic model is proposed and the free blowing simulation is compared with the experimental results managed in Queen's University Belfast.
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