Nonlinear viscoelastic–plastic constitutive description of proton exchange membrane under immersed condition

The nonlinear viscoelastic–plastic responses of proton exchange membrane (PEM) under immersed condition at 30 and 70 °C are experimentally studied. For the description of the viscoelastic–plastic behavior of the material, Schapery's nonlinear viscoelastic model is used in combination with a non...

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Bibliographic Details
Published in:Journal of power sources 2012-09, Vol.213, p.40-46
Main Authors: Shi, Shouwen, Yu, Dunji, Gao, Lilan, Chen, Gang, Chen, Jian, Chen, Xu
Format: Article
Language:English
Subjects:
Applied sciences
Constitutive law
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Nafion
Nonlinear viscoelastic
plastic deformation
Polymer industry, paints, wood
Technology of polymers
Water immersion
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Summary:The nonlinear viscoelastic–plastic responses of proton exchange membrane (PEM) under immersed condition at 30 and 70 °C are experimentally studied. For the description of the viscoelastic–plastic behavior of the material, Schapery's nonlinear viscoelastic model is used in combination with a nonlinear viscoplastic constitutive law. PEM's creep–relaxation behavior is predicted by the model with a constant duration at various stresses and a fixed stress level with different durations. The prediction results are found to agree quite well with experimental values at 30 °C. A step-stress input profile is conducted to validate the model and the result shows reasonable agreement with the experimental data indicating that the proposed model provides the capability to describe the characteristic of membranes in liquid water. However, this model cannot describe the creep behavior at 70 °C precisely mainly due to the distinct behavior of the membrane at the temperature. Thus, a modified model is developed and prediction values of the modified model at 30 and 70 °C are both found to be in good accordance with experimental results. ► The nonlinear viscoelastic–plastic responses of PEM under immersed condition are studied. ► Schapery's model with a nonlinear viscoplastic law is used to predict creep–relaxation. ► A modified model is developed to predict stress response under immersed condition.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2012.03.082