Stretch blow moulding of PET; structure development and constitutive model

作者：Billon N^*; Picard M; Gorlier E

来源：International Journal of Material Forming, 2014, 7(3): 369-378.

DOI：10.1007/s12289-013-1131-1

• PET
• Strain induced crystallisation
• Microstructure development
• Constitutive model

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 %26quot;nucleation -growth%26quot; 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.

• 出版日期2014-9