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

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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.

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Authors and Affiliations

  1. CEMEF—Centre de Mise en Forme des Matériaux, CNRS UMR 7635, MINES ParisTech, BP 207, 1 rue Claude Daunesse, 06904, Sophia Antipolis, France

    Jean-Marc Haudin, Aurélien Carin & Michel Vincent

  2. CERDATO—Centre de Recherche, Développement, Applications et Technique de l’Ouest, Arkema, 27470, Serquigny, France

    Nicolas Amouroux, Gaëlle Bellet & Fabrice Montezin

Authors
  1. Jean-Marc Haudin
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  2. Aurélien Carin
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  3. Michel Vincent
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  4. Nicolas Amouroux
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  5. Gaëlle Bellet
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  6. Fabrice Montezin
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Correspondence to Jean-Marc Haudin.

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Haudin, JM., Carin, A., Vincent, M. et al. Relationships between processing conditions and mechanical properties of PA12 tubes. The EWF approach. Int J Mater Form 3, 225–231 (2010). https://doi.org/10.1007/s12289-009-0673-8

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  • DOI: https://doi.org/10.1007/s12289-009-0673-8

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