Abstract
Fatigue crack growth behavior of perfluorosulfonic-acid membrane is investigated under single overload conditions by in-situ fatigue testing. The results show that the effected range of overload on cyclic plasticity positively correlates with the overload ratio (Rol), indicating that overload-induced residual stress is aggravated with increase of Rol. Besides, crack-tip sharpening occurred at higher Rol can promote cyclic plasticity deformation, thus initially accelerating the crack growth. Moreover, the cyclic plasticity can be used to interpret the post-overload crack growth. Based on plastically dissipated energy, a numerical scheme incorporated with developed elastic-viscoplastic constitutive relationship is established to predict the fatigue crack growth.
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