Aged marine structural analysis often relies on simplified corrosion modelling. Empirical or statistical methods are used to predict a uniform thickness reduction over time. Although convenient, this approach cannot incorporate the corrosion evolution or the rough surfaces in the damaged area. This is fundamentally due to the lack of representation of the underlying corrosion mechanisms in service environments. To better understand how structural response changes based on corrosion under service loads, this paper presents a series of finite element analyses which consider the coupling relationship between the surface mechanical stresses and the resulting change of corrosion rate. The coupling provide complex corrosion-stress interaction depending on the experimental datasets. The quantification of this interaction is based on in situ experimental measurements of corrosion kinetics at different stress levels. The simulations show the stress effect results in the generation of more realistic corrosion patterns on the structural surface, based on a two-bay/two-span large-scale panel model subject to uniaxial compression. In addition, the incorporation of corrosion experiments allows the modelling of corrosion evolution based on physical observations instead of empirical assumptions. The irregular surface damage leads to a change in structural buckling mode, and up to 8% reduction in ultimate strength compared to models without considering the stress effect.

老化的海洋结构分析通常依赖于简化的腐蚀建模。使用经验或统计方法来预测随时间的均匀厚度减小。尽管很方便，但是这种方法不能在腐蚀区域中纳入腐蚀演变或粗糙表面。从根本上讲，这是由于在服务环境中缺乏对潜在腐蚀机制的表示。为了更好地理解结构应力在服务载荷下基于腐蚀的变化方式，本文提出了一系列有限元分析，其中考虑了表面机械应力与腐蚀速率变化之间的耦合关系。取决于实验数据集，该耦合提供了复杂的腐蚀-应力相互作用。这种相互作用的量化基于不同应力水平下腐蚀动力学的原位实验测量。仿真结果表明，应力作用导致结构表面上产生更逼真的腐蚀模式，这是基于经受单轴压缩的两间隔/两跨大型面板模型。另外，腐蚀实验的结合允许基于物理观测而不是经验假设对腐蚀演变进行建模。与不考虑应力作用的模型相比，不规则的表面损伤会导致结构屈曲模式的变化，并且最终强度最多降低8％。