Evaluation of Methodologies to Accelerate Corrosion Assisted Fatigue Experiments

摘要: The corrosive nature of a marine environment is an important factor to be considered during the fatigue design offshore structures. Thereto S-N curves must determined in close real conditions which highly time consuming. It hypothesized that if corrosion process accelerated at approximately same rate as frequency, testing could reduced. Corrosion acceleration possible by modifying physical and/or electrochemical properties involved redox reactions. In this work first option was chosen. Based on literature review temperature and dissolved oxygen level were concluded most influencing parameters. Several test scenarios with different combinations sea water have been defined. Corresponding constructed for HSLA steel (type DNV F460) specimens immersed natural seawater. direct current potential drop technique used quantify damage evolution all tested scenarios. Additionally, reference curve behaviour frequency North Sea conditions. Comparison experimental results indicates average assisted around 80 % obtained.