J. Phys. IV France 11 (2001) Pr4-275-Pr4-281
Mechanical behaviour of a semicrystalline polymer before neckingN. Brusselle-Dupend, D. Lai, X. Feaugas, M. Guigon and M. Clavel
Université de Technologie de Compiègne, Laboratoire Roberval (ex. LG2MS), UMR UTC-CNRS, BP. 20529, 60205 Compiègne cedex, France
The behaviour of semicrystalline polypropylene (PP) was studied in the pre-necking domain. Mechanical tests were performed to characterize the behaviour of this multiphase material. Test results have distinctly characterized both its viscoelastic and its viscoplastic behaviour. The usual approach to studying metals was adopted to investigate the effect of heterogeneities caused by spherulitic morphology. By this macroscopic approach, the macroscopic stress was split into an effective stress and a back stress so that the interactions between crystalline lamellae and amorphous phases could be taken into account. This improved knowledge of the macroscopic mechanical behaviour was used to develop both viscoelastic and viscoplastic models.
© EDP Sciences 2001