Anisotropy and mechanical properties of bioriented PVC pipes

Abstract : A specific process devoted to the biorientation of PVC pipes is studied. It consists of the simultaneous blowing and stretching of an extruded pan: The tensile and impact properties of these pipes are analysed and compared to the performances of an usual extruded pipe and a blown pipe (no stretching). The blowing significantly increases the properties of the pipes in the orthoradial theta-direction. In the longitudinal z-direction, the tensile properties remain almost unchanged. Nevertheless, when impact properties are considered, the monooriented PVC exhibits very weak performances. The biorientation induced by an additional stretching makes the properties in the z-direction increase without decreasing the theta performance. Impact properties are significantly increased compared both to extruded pipes and blown pipes. This improvement in the properties is related to an important modification of the microstructure. The molecules of the PVC are oriented and the material behaves like a laminate composed of a great number of bioriented (theta-z) layers. The damage induced by impacts seems to be a delamination.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00538383
Contributeur : Corinne Matarasso <>
Soumis le : lundi 22 novembre 2010 - 13:54:38
Dernière modification le : lundi 12 novembre 2018 - 10:56:03

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  • HAL Id : hal-00538383, version 1

Citation

Noëlle Billon, Helmut Kappel, S. Crozet, François Bay, Jean-François Agassant, et al.. Anisotropy and mechanical properties of bioriented PVC pipes. Revue de Metallurgie. Cahiers D'Informations Techniques, 1999, 96 (12), p.1517-1522. ⟨hal-00538383⟩

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