Titre :

Repeated equal-channel angular extrusion of polypropylene: processing routes and back-pressure influence

Auteur(s) :

Boulahia, Ramdane [Auteur]
Zairi, Fahmi [Auteur]
Laboratoire Génie Civil et géo-Environnement (LGCgE) - ULR 4515
Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 [LGCgE]
Voznyak, Yuri [Auteur]
Gloaguen, Jean-Michel [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Unité Matériaux et Transformations - UMR 8207 [UMET]

Nom court de la revue :

Mater. Today Commun.

Numéro :

26

Pagination :

-

Date de publication :

2021-03-01

ISSN :

2352-4928

Mot(s)-clé(s) :

Microstructure
Multi-pass
High plastic deformation
Equal-channel angular extrusion
Mechanical properties

Discipline(s) HAL :

Sciences du Vivant [q-bio]

Résumé en anglais : [en]

Multi-pass equal channel angular extrusion (ECAE) process of polypropylene was investigated at room temperature using a 90° die-angle tooling outfitted with a back-pressure. The process was repeated until eight times using ...
Lire la suite >Multi-pass equal channel angular extrusion (ECAE) process of polypropylene was investigated at room temperature using a 90° die-angle tooling outfitted with a back-pressure. The process was repeated until eight times using two different extrusion orientation routes: route A where the sample orientation is kept constant between each extrusion and route C where the sample is rotated by 180°. The crystalline textures were examined by WAXS measurements and the changes on the mechanical response were observed by full-field strain measurements during tensile tests. The use of a back-pressure turns the deformation behavior, along the flow direction of the ECAE products, from highly heterogeneous (characterized by a peculiar periodic shear-banding behavior) to roughly homogeneous and leads to completely different plastic processes in the crystalline phase. The textural differences subsequent to the multi-pass processing and the use of a back-pressure are the source of significant differences in tensile response along the flow direction. The observations show that the polypropylene processed via route C reaches more easily a saturation state than that obtained via route A with a strong beneficial influence of a back-pressure.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

CNRS
ENSCL
IMT Lille Douai
INRA
Institut Catholique Lille
Univ. Artois
Université de Lille

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Ingénierie des Systèmes Polymères

Date de dépôt :

2022-06-15T14:00:07Z
2023-12-19T16:33:34Z