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

被引：81

作者：

Belbachir, S. ^{[1
,2
]}

Zairi, F. ^{[1
]}

Ayoub, G. ^{[1
]}

Maschke, U. ^{[3
]}

Nait-Abdelaziz, M. ^{[1
]}

Gloaguen, J. M. ^{[4
]}

Benguediab, M. ^{[2
]}

Lefebvre, J. M. ^{[4
]}

机构：

[1] Univ Lille 1 Sci & Technol, CNRS, UMR 8107, Lab Mecan Lille, F-59655 Villeneuve Dascq, France

[2] Univ Djillali Liabes Sidi Bel Abbes, Dept Mecan, Sidi Bel Abbes 2200, Algeria

[3] Univ Lille 1 Sci & Technol, CNRS, UMR 8009, Lab Chim Macromol, F-59655 Villeneuve Dascq, France

[4] Univ Lille 1 Sci & Technol, CNRS, UMR 8008, Lab Struct & Proprietes Etat Solide, F-59655 Villeneuve Dascq, France

来源：

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2010年 / 58卷 / 02期

关键词：

Photodegradation; Elastic-viscoplastic modelling; Finite strain; Polymeric material; STRAIN-INDUCED CRYSTALLIZATION; CONSTITUTIVE MODEL; CROSS-LINKING; POLY(L-LACTIDE) FILMS; ENZYMATIC DEGRADATION; FINITE DEFORMATION; RELATIVE-HUMIDITY; GLASSY-POLYMERS; POLY(ETHYLENE-TEREPHTHALATE); TEMPERATURE;

D O I：

10.1016/j.jmps.2009.10.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 degrees 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. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：241 / 255

页数：15

共 46 条

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