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Caractérisation de la variation volumique du polyéthylène
au cours de la déformation plastique en traction et en fluage

Abstract : The mechanical behavior of polyethylene is determined by means of VidéoTraction system under tension and creep. The most unexpected result is the volume variation: one notes a competition between a compaction phenomenon and a dilation effect after the elastic expansion. Other techniques and an evaluation of errors arising from the extensometer device have shown that dilatation is the leading process and compaction is of second order. The evolution of solid matrix and the development of cavities have been separated. The polymer matrix is affected by two opposite processes that compensate nearly exactly one another: crystalline order destruction and orientation of amorphous chains. As such, cavitation is the most active mechanism. A model predicting the dilatation amplitude has been developed from the microstructural data. Finally, the overall mechanical equations have been decomposed into an intrinsic component (polymer matrix) and a volume component (cavitation)
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https://tel.archives-ouvertes.fr/tel-00118326
Contributor : Frédéric Addiego <>
Submitted on : Monday, December 4, 2006 - 8:54:05 PM
Last modification on : Thursday, November 12, 2020 - 3:42:03 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 7:03:35 PM

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  • HAL Id : tel-00118326, version 1

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Frédéric Addiego. Caractérisation de la variation volumique du polyéthylène
au cours de la déformation plastique en traction et en fluage. Mécanique [physics.med-ph]. Institut National Polytechnique de Lorraine - INPL, 2006. Français. ⟨tel-00118326⟩

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