Modélisation des non-linéarités en vitesse de déformation et du comportement en déchargement des polymères semi-cristallinsNon Linear Strain Rate Dependency and Unloading Behavior of Semi-Crystalline Polymers | Oil & Gas Science and Technology

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Issue		Oil & Gas Science and Technology - Rev. IFP Energies nouvelles Volume 61, Number 6, November-December 2006 Dossier: Deformation of Solid Polymers


Page(s)		743 - 749
DOI		10.2516/ogst:2006012

Oil & Gas Science and Technology - Rev. IFP, Vol. 61 (2006), No. 6, pp. 743-749
DOI: 10.2516/ogst:2006012

Non Linear Strain Rate Dependency and Unloading Behavior of Semi-Crystalline Polymers

Modélisation des non-linéarités en vitesse de déformation et du comportement en déchargement des polymères semi-cristallins

K. Hizoum¹, Y. Rémond¹, N. Bahlouli¹, V. Oshmyan², S. Patlazhan² and S. Ahzi¹

¹ Institut de Mécanique des Fluides et des Solides, Université Louis Pasteur, 2, rue Boussingault, 67000 Strasbourg - France, email: hizoum@imfs.u-strasbg.fr, remond@imfs.u-strasbg.fr, bahlouli@imfs.u-strasbg.fr, ahzi@imfs.u-strasbg.fr
² Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4, Kosygin Street, Moscow, 119991 - Russia, email: sapat@polymer.chph.ras.ru

Abstract
The classical viscoelastic constitutive equations do not simulate correctly the mechanical behavior of semi crystalline polymers, particularly in the case of the strain rate jumping or unloading to zero stress after tensile testing. The main experimental observations of mechanical response of polyethylene and polypropylene at small strains are reviewed. A physical model, which account for the deformation-induced evolution of the material structure, is developed and compared to the experimental observations. It is concluded that this model is the most adequate approach for the simulation of the mechanical behavior and the structure development of semi-crystalline polymers under loading and unloading.

Résumé
Les lois viscoélastiques classiques ne permettent pas de décrire complètement les comportements caractéristiques des polymères semi-cristallins, comme ceux observés lors de sauts de vitesses ou en déchargement. Nous présentons dans cet article certaines particularités du comportement mécanique pour un polyéthylène ou un polypropylène en petites déformations. Un modèle physique incluant une évolution de la microstructure est présenté et comparé aux observations expérimentales. Ce modèle permet une forte amélioration des simulations des comportements mécaniques en chargement et déchargement pour une large classe de polymères semicristallins.

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