Abstract
In this study, at first, MD simulation is performed to clarify the effect of water contents on the distribution of density of molecular chains of PEM under uniaxial tension. It is found that the lower water contents the more remarkable change of the density of molecular chains of PEM, which may lead to a high possibility of the nonaffine movement of the physically entangled points in the molecular network. Continuously, a computational model, in which the development of the number of the physically entangled points is assumed to be a function of the relative humidity, is employed to discuss the effect of the water contents on the mechanical behavior of PEM under various loading condition.
