Abstract
Abstract For the steel structures those are used in harsh sea environments, corrosion fatigue is a challenging issue in connection with design life. In this research, in order to investigate the influence of cathodic overprotection on the corrosion fatigue crack propagation behavior, corrosion fatigue crack propagation test under the condition of -950mV vs SCE was conducted by using of high tensile TMCP steel plate and the relationships between da/dN-ΔK were obtained. At this test, when ΔK is low, the crack propagation rates were accelerated compared to those of seawater condition, however, when ΔK is high, the crack propagation rates were lower than those of seawater condition. As the cause for the acceleration and deceleration of corrosion fatigue crack propagation rates under the condition of cathodic overprotection, the role of hydrogen and calcareous deposits are discussed. Key Words : Fracture Mechanics, Corrosion Fatigue, Cathodic Overprotection, Synthetic Seawater 본 논문은 울산과학대학교 연구과제로 수행되었음.
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