Tensile Creep Behaviors and Intrinsic Descriptions of Proton Exchange Membranes under the Temperature-Stress Coupling
As the core component of the proton exchange membrane cell,its creep behaviors are crucial to the structure designs of the proton exchange membrane cell.The coupled influence laws of stress and temperature on the short-term creep behaviors of proton exchange membranes were investigated by studying the tensile creep properties of proton exchange membranes at different temperatures and stresses.The Burgers model and Findley power law model were used to fit the short-term creep behavior of proton exchange membranes,and the correlation coefficients and variation rules of the Burgers model and Findley power law model were analyzed.The results show that the creep curves of the proton exchange membranes contain transient creep stage and steady state creep stage at different temperatures and stress levels.Instantaneous elastic deformation,delayed elastic deformation and viscous flow deformation all show the dependences on temperature and stress.Burgers model and Findley power law model could well simulate the creep behaviors of the proton exchange membranes.Finally,the stress index and creep activation energy were obtained through the quantitative relationships between the steady-state creep rate,temperature and stress level.The creep behaviors and mechanisms of proton exchange membranes were also analyzed.
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