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Abstract
Many structures, such as oil platforms and wind turbines, are built in the marine environment. These structures do not merely suffer from variable cyclic loading due to wind, waves and current, but also from corrosion. Their interaction can give rise to corrosion fatigue, thus reducing the service life and integrity of the structure. The research community witnesses a challenge to identify damage mechanisms of combined fatigue loading and corrosion, and to link this to the lifetime prediction of offshore structures. In this paper, a non-linear corrosion fatigue model is proposed to describe damage accumulation based on continuum damage mechanics. Fatigue endurance limit, load frequency and corrosion rate are included in the model as basic parameters which influence the interaction between fatigue and corrosion. A sequential load effect is revealed via integration of the non-linear accumulation of damage. Parametric studies are conducted to show the abilities of the model. Preliminary simulation results agree to a strong extent with experimental data in the form of corrosion fatigue S-N curves. Nonetheless, deviations are observed at lower life times and these are prone to further investigation. In the future, parameters will be calibrated and further validation experiments will be performed.
Highlights
Offshore structures, such as supporting structures of offshore renewable energy applications, experience millions of cyclic loads due to wind, waves and current
The synergistic interaction between a corrosive environment and cyclic loading may amplify the development of fatigue damage, and is referred to as corrosion fatigue
The corrosion fatigue model proposed in this study is based on non-linear continuum damage mechanics (CDM), which is suitable for making engineering predictions about the initiation, propagation, and fracture of materials without resorting to a microscopic description that would be too complex for practical engineering analysis (9)
Summary
Offshore structures, such as supporting structures of offshore renewable energy applications, experience millions of cyclic loads due to wind, waves and current. Fatigue failure can occur when accumulated damage (propagation of an initiated fatigue crack) reaches the critical tolerance value of the structures. The synergistic interaction between a corrosive environment and cyclic loading may amplify the development of fatigue damage, and is referred to as corrosion fatigue. It is reported that pits form and grow on the surface of materials in a corrosive environment (4-6). When this happens, changes in the surface morphology introduce stress concentrations which facilitate fatigue crack initiation. It is difficult to satisfactorily model the entire physical mechanism due to the complexity of the corrosion fatigue process, which includes the stage of pit formation, pit growth, fatigue crack initiation and its propagation. The capability of mode to predict load interaction sequences effects are showed by a two-level loading study
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