Numerical simulation of the thermodependant viscohyperelastic behavior of polyethylene terephthalate near the glass transition temperature: Prediction of the self‐heating during biaxial tension test

• DOI: 10.1002/pen.23522
• Publication Date: 2013-04-11T04:56:41Z
• Authors: Yun‐Mei Luo; Luc Chevalier; Françoise Utheza; Eric Monteiro
• Keywords: Isothermal process; Hyperelastic material; Thermoforming; Tension (geology)

The poly ethylene terephthalate near the glass transition temperature highlights a strongly non linear elastic and viscous behaviour when biaxially stretched at high strain rates representative of injection stretch blow moulding process. A visco‐hyperelastic model, where characteristics are coupled to temperature, has already been identified from equi‐biaxial tension experimental results. weak form mechanical part model is presented implemented into finite element code developed in Matlab environment validated by comparing numerical simulation testing with analytical solution isothermal case. Considering thermal aspects, an study, PET sheets heated using infrared (IR for short) lamps also presented. modeling IR radiation sheet helps identify properties PET. then code, 2D viscoelastic model. discussion made justify accuracy assumption on homogeneity field through thickness. plane stress equibiaxial test shows important influence aspects thermo‐mechanical software used quantify self‐heating phenomenon case biaxial elongations rates. POLYM. ENG. SCI., 53:2683–2695, 2013. © 2013 Society Plastics Engineers