A computational model of rain erosion of wind turbine blades is presented. The model is based on the transient fluid–solid coupled finite element (FE) analysis of rain droplet/coating interaction and fatigue degradation analysis. The fatigue analysis of the surface degradation is based on multiaxial fatigue model and critical plane theory. The random rain fields are constructed computationally, and the estimated droplet sizes are included in FE model to acquire a library of load histories. Subsequently, the resulted nonproportional multiaxial high cycle fatigue problem is solved to assess the damage and lifetimes of the coatings. The approach can be used to design new coating systems withstanding longer service times.

中文翻译：

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风力涡轮机叶片的前缘腐蚀：随机液体冲击下涂层降解的多轴临界平面疲劳模型

提出了风轮机叶片雨水侵蚀的计算模型。该模型基于雨滴/涂层相互作用的瞬态流固耦合有限元（FE）分析和疲劳退化分析。表面退化的疲劳分析基于多轴疲劳模型和临界平面理论。通过计算构造随机雨场，并将估计的液滴尺寸包含在有限元模型中，以获取载荷历史库。随后，解决了由此产生的非比例多轴高循环疲劳问题，以评估涂层的损坏和寿命。该方法可用于设计使用寿命更长的新涂层系统。