Modelling of photodegradation effect on elastic–viscoplastic behaviour of amorphous polylactic acid films - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the Mechanics and Physics of Solids Année : 2010

Modelling of photodegradation effect on elastic–viscoplastic behaviour of amorphous polylactic acid films

Résumé

Polylactic acid (PLA) films were subjected to accelerated ultra-violet (UV) ageing. The UV irradiation leads to the alteration of the chemical structure which influences directly the mechanical response of the polymer. The chemical modification of the polymer was followed by gel permeation chromatography. Uniaxial tension tests were conducted at 50 °C and for different strain rates in order to characterize the large deformation response of PLA. The influence of UV irradiation on the alteration of the large deformation response of PLA was examined. A physically based elastic–viscoplastic model was used to describe the mechanical response of virgin PLA. The photodegradation effect was incorporated into the constitutive model to capture the stress–strain behaviour up to failure of aged PLA. To that end, the measured molecular weight was used as a direct input into the model. The model is shown to be in good agreement with experimental results over a wide range of UV irradiation doses.

Dates et versions

hal-00447104 , version 1 (14-01-2010)

Identifiants

Citer

S. Belbachir, Fahmi Zaïri, Georges Ayoub, U. Maschke, Moussa Nait-Abdelaziz, et al.. Modelling of photodegradation effect on elastic–viscoplastic behaviour of amorphous polylactic acid films. Journal of the Mechanics and Physics of Solids, 2010, 58 (2), pp.241-255. ⟨10.1016/j.jmps.2009.10.003⟩. ⟨hal-00447104⟩

Collections

CNRS
39 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More