Optimization of the Thickness of PET Bottles during Stretch Blow Molding by Using a Mesh-free (Numerical) Method

• DOI: 10.3139/217.2215
• Publication Date: 2009-06-25T12:57:58Z
• Authors: B. Cosson; L. Chevalier; J. Yvonnet
• Keywords: Blow molding; Viscoplasticity; Hardening (computing); Distortion (music)

Abstract The stretch-blow molding process of polyethylene terephthalate (PET) bottles generates some important modifications in the mechanical properties material. Considering, temperature (T > T g ) that is usually used, material exhibits a very high viscosity and involves strain hardening effect associated with microstructure evolution. An anisotropic viscoplastic model coupled induced properties, identified from experimental results uniaxial biaxial tensile tests previously published by Chevalier Marco (2006), presented first part paper. Secondly, we perform numerical simulation to simulate free inflation preform under an internal pressure different parameters. Because final strains are up 300 400%, it distortion node distribution chose use mesh-free Constrained Natural Elements Method (C-NEM) for simulation. goal these simulations order fit best parameter set leading quasi-homogeneous thickness along bottle. Homogeneous implies homogeneous stretching more uniform bottle this industrial goal.