[Une loi de comportement pour les polymères semi-cristallins se déformant par fragmentation]
Le mécanisme de fragmentation lamellaire, observé lors de la déformation des polymères semi-cristallins à structure sphérolitique, apparaît et endommage considérablement la microstructure, dès le début de l'écoulement plastique. Dans cette Note, consacrée à la modélisation du comportement de ces matériaux, le mécanisme élémentaire de fragmentation est pris en compte à l'aide d'un couplage plasticité/endommagement. Les développements présentés reposent sur la considération d'un réseau macromoléculaire bridé par les forces cohésives intra-lamellaire. Des essais de traction cyclique et de relaxation, sur le polybutène, valident l'intérêt de l'approche proposée.
The mechanism of lamellar fragmentation in the semi-crystalline polymers with spherulitic structure, is observed at the beginning of plastic flow. It causes significant damage. This elementary mechanism is considered here as a result of plastic deformation coupled with damage, in the framework of generalized standard materials. The simplicity and the efficiency of the proposed approach come from the fact that the semi-crystalline polymers are considered as a macromolecular network bridled by intra-lamellar cohesive forces. Tensile tests and relaxation tests demonstrate the usefulness of a damage–plasticity coupled model.
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Mots-clés : Génie des matériaux, Polymère semi-crystallin, Fragmentation, Dommage, Plasticité, Visco-élasticité, Polybutène
Fabrice Detrez 1, 2 ; Sabine Cantournet 2 ; Roland Séguéla 1
@article{CRMECA_2010__338_12_681_0,
author = {Fabrice Detrez and Sabine Cantournet and Roland S\'egu\'ela},
title = {A constitutive model for semi-crystalline polymer deformation involving lamellar fragmentation},
journal = {Comptes Rendus. M\'ecanique},
pages = {681--687},
publisher = {Elsevier},
volume = {338},
number = {12},
year = {2010},
doi = {10.1016/j.crme.2010.10.008},
language = {en},
}
TY - JOUR AU - Fabrice Detrez AU - Sabine Cantournet AU - Roland Séguéla TI - A constitutive model for semi-crystalline polymer deformation involving lamellar fragmentation JO - Comptes Rendus. Mécanique PY - 2010 SP - 681 EP - 687 VL - 338 IS - 12 PB - Elsevier DO - 10.1016/j.crme.2010.10.008 LA - en ID - CRMECA_2010__338_12_681_0 ER -
%0 Journal Article %A Fabrice Detrez %A Sabine Cantournet %A Roland Séguéla %T A constitutive model for semi-crystalline polymer deformation involving lamellar fragmentation %J Comptes Rendus. Mécanique %D 2010 %P 681-687 %V 338 %N 12 %I Elsevier %R 10.1016/j.crme.2010.10.008 %G en %F CRMECA_2010__338_12_681_0
Fabrice Detrez; Sabine Cantournet; Roland Séguéla. A constitutive model for semi-crystalline polymer deformation involving lamellar fragmentation. Comptes Rendus. Mécanique, Volume 338 (2010) no. 12, pp. 681-687. doi : 10.1016/j.crme.2010.10.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.10.008/
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