Corrosion Damage Effects on the Structural Integrity Assessment of Offshore Structures

在海上结构（如海上风力涡轮机和油气管道）的结构完整性评估中，需要考虑的一个重要问题是，由于环境破坏而导致的材料降解特征及其对剩余寿命预测的后续影响。该项目的主要目的是利用实验测试和数值模拟技术，研究腐蚀和腐蚀疲劳损伤在海上钢焊接件（即母材、热影响区和焊缝金属）结构完整性评估中的重要性。广泛用于海洋工业的S355结构钢焊接件将在不同的腐蚀环境中暴露不同的持续时间，并检查材料的机械响应，断裂和疲劳裂纹扩展行为的相应变化。此外，将开发并验证一个数值模型，以预测海水环境下S355焊接件的腐蚀点蚀、腐蚀失重和腐蚀疲劳裂纹扩展行为。

An important issue to be considered in the structural integrity assessment of offshore structures, such as offshore wind turbines and Oil & Gas pipelines, is the characterisation of material degradation due to environmental damage and its subsequent effects on the remaining lifetime predictions. The main aim of this project is to investigate the importance of corrosion and corrosion-fatigue damage in the structural integrity assessment of offshore steel weldments (i.e. base metal, heat affected zone and weld metal) using experimental testing and numerical modelling techniques. S355 structural steel weldments, which are widely used in offshore industry, will be exposed to different corrosive environments for various durations and the corresponding changes in the mechanical response, fracture and fatigue crack growth behaviour of the material will be examined. Furthermore, a numerical model will be developed and validated to predict corrosion pitting, corrosion weight loss and corrosion-fatigue crack growth behaviour in S355 weldments in the seawater environment.