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Stretch blow moulding of PET; structure development and constitutive model

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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Submitted on : Tuesday, May 7, 2013 - 10:03:57 AM
Last modification on : Monday, July 4, 2022 - 9:46:40 AM



Noëlle Billon, Martin Picard, Eric Gorlier. Stretch blow moulding of PET; structure development and constitutive model. International Journal of Material Forming, Springer Verlag, 2014, 7 (3), pp.369-378. ⟨10.1007/s12289-013-1131-1⟩. ⟨hal-00820970⟩



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