Stretch blow moulding of PET ; structure development and constitutive model Article - Septembre 2014

Noëlle Billon, Martin Picard, Eric Gorlier

Noëlle Billon, Martin Picard, Eric Gorlier, « Stretch blow moulding of PET ; structure development and constitutive model  », International Journal of Material Forming, septembre 2014, pp. 369-378. ISSN 1960-6206

Abstract

Microstructure of PET in stretch blow moulding is studied combining controlled tension followed by quenching, free-blow and ISBM. Due to quenching, observed final microstructure is often closer to a mesophase than to crystal. Texture is, for its part, controlled by the loading path. In fact stretching only induces appearance of an oriented precursor-phase that will become a crystal during cooling steps providing that this latter is slow enough. Microstructure evolution does not obey the classical "nucleation -growth" schematic. This enlightens development of constitutive models demonstrating the irrelevance of the crystallinity ratio as parameter and of the Avrami-like approach as part of the model. One, model based on revisited network approach is suggested.

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