Case Studies &


Finite Element Simulations of stretch-blow moulding with experimental validation over a broad proces

Abstract: Injection stretch blow moulding is a well-established method of forming thin-walled containers and has been extensively researched for numerous years. This paper is concerned with validating the finite element analysis of the free-stretch-blow process in an effort to progress the development of injection stretch blow moulding of poly(ethylene terephthalate). Extensive data was obtained experimentally over a wide process window accounting for material temperature and air flow rate, while capturing cavity pressure, stretch-rod reaction force and preform surface strain. This data was then used to assess the accuracy of the correlating FE simulation constructed using ABAQUS/Explicit so

A novel methodology to characterize the constitutive behaviour of polyethylene terephthalate for the

Highlights: • A new characterization method for materials under blowing conditions is developed. • The method relies on specialist instrumentation and digital image correlation. • Constitutive behaviour of materials obtained solely by a preform during blowing. Abstract: The stretch blow moulding (SBM) process is the main method for the mass production of PET containers. And understanding the constitutive behaviour of PET during this process is critical for designing the optimum product and process. However due to its nonlinear viscoelastic behaviour, the behaviour of PET is highly sensitive to its thermomechanical history making the task of modelling its constitutive behaviour complex. This

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