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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 5/2-3-4 - 2002  - pp.413-421  - doi:10.3166/ijfp.5.413-421
TITLE
Forming Limit Curves in Blow Molding for a Polymer Exhibiting Deformation Induced Crystallization

ABSTRACT

We address in this paper the problem of blow molding for a polymer exhibiting a deformation induced crystallization (e.g. Poly EthyleneTerephthalate or PET). In a first part, we give the equations of a model that couples the mechanics to the crystallization for a class of molecular models (e.g. Maxwell or POM-POM models). In a second part, without a real stabilities analysis, we follow the Swift analysis for biaxial deformations. We conclude this study in showing that it is possible to quantify how crystallization during the process stabilizes it. In enhancing strongly the strain hardening, crystallization is namely a stability factor against necking.

AUTEUR(S)
Arnaud POITOU, Amine AMMAR, Germaine NEFUSSI

KEYWORDS
Quiescent and induced crystallization, blow molding, considere criterion, necking.

LANGUE DE L'ARTICLE
Anglais

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