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1 CEMEF - Centre de Mise en Forme des Matériaux 2 Arkema

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. EWF is very sensitive to processing conditions, and especially to induced orientation: 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





Autor: Jean-Marc Haudin - Aurélien Carin - Michel Vincent - Nicolas Amouroux - Gaëlle Bellet - Fabrice Montezin -

Fuente: https://hal.archives-ouvertes.fr/



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