Relationships between processing conditions and mechanical properties of PA12 tubes. The EWF approach

Jean-Marc Haudin 1 Aurélien Carin 1 Michel Vincent 1 Nicolas Amouroux 2 Gaëlle Bellet 2 Fabrice Montezin 2
1 CEMEF - Centre de Mise en Forme des Matériaux
2 CERDATO - Centre de recherche, développement, applications et technique de l'ouest
Abstract : In polyamide 12 (PA12) tube extrusion, calibration is the key step of the process that affects the subsequent mechanical properties. In previous work it has been shown that according to the calibration conditions, a very oriented skin layer may be created, which has been correlated to an important decrease of elongation at break. In this paper, we present new results showing a good correlation between molecular orientation and fracture toughness, as evaluated by the EWF (Essential Work of Fracture) approach. They concern notched specimens and confirm the results obtained in classical tensile testing. The specific essential work of fracture is very sensitive to the orientation generated in the skin region by appropriate processing conditions: it decreases from the external to the inner regions of the tube, and increases with skin orientation.
Keywords : Polyamide 12 Tube extrusion Calibration Molecular orientation Essential work of fracture
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Article dans une revue
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00546953
Contributeur : Nadine Alziary - Manuel <>
Soumis le : mercredi 15 décembre 2010 - 11:15:47
Dernière modification le : jeudi 28 mars 2019 - 17:08:01

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ENSMP | ENSMP_CEMEF | PARISTECH | PSL | INSTITUT-TELECOM

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Jean-Marc Haudin, Aurélien Carin, Michel Vincent, Nicolas Amouroux, Gaëlle Bellet, et al.. Relationships between processing conditions and mechanical properties of PA12 tubes. The EWF approach. International Journal of Material Forming, Springer Verlag, 2010, 3 (4), pp.Pages 225-231. ⟨10.1007/s12289-009-0673-8⟩. ⟨hal-00546953⟩

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