A constitutive model for semi-crystalline polymer deformation involving lamellar fragmentation

Une loi de comportement pour les polymères semi-cristallins se déformant par fragmentation

Fabrice Detrez (1, 2) , Sabine Cantournet (1) , Roland Seguela (2)

1 CDM - Centre des Matériaux
2 UMET - Unité Matériaux et Transformations - UMR 8207

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.

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.

Mots clés: Material engineering; Semi-crystalline polymer; Fragmentation; Damage; Plasticity; Visco-elasticity; Polybutene

Domaines: Matériaux

Fabrice Detrez, Sabine Cantournet, Roland Seguela. A constitutive model for semi-crystalline polymer deformation involving lamellar fragmentation. Comptes Rendus Mécanique, 2010, 338 (12), pp.681-687. ⟨10.1016/j.crme.2010.10.008⟩. ⟨hal-00542497⟩