In northern regions, wind turbines are affected by the formation of ice on the surface of their structures, which usually occurs on moving blades, resulting in a significant decrease in aerodynamic performance and then the output power tends to reduce. This research evaluates the mechanical behavior and damage of the proposed composite blade structure under icing conditions. A comparative evaluation was carried out considering three ice configurations and three blade positions. The results are then examined and analysed. During this study, the blade in service was subjected to three different critical loads. A numerical simulation is adopted using finite element method (FEM) with ABAQUS software to localize damage in the composite wind turbine blade. The method developed is based on the failure criteria of HASHIN to detect failure modes in large structures and to identify the most sensitive zones. Major damage appeared in the transition region and was the principal reason for the composite blade failure. Furthermore, greater strength and stiffness were found with Carbon (CC) fibers blade designs, whereas configuration 3 was found to be the best one, and the optimal blade position was when the ice structure was placed vertically.

中文翻译：

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临界载荷下海上复合式风力发电机结冰的数值研究

在北部地区，风力涡轮机受其结构表面上冰的形成的影响，这通常发生在活动叶片上，导致空气动力性能显着下降，然后输出功率趋于降低。这项研究评估了在结冰条件下所提出的复合材料叶片结构的机械性能和损伤。考虑到三个冰的形状和三个叶片的位置进行了比较评估。然后检查结果并进行分析。在这项研究中，使用中的刀片承受了三种不同的临界载荷。使用有限元方法（FEM）和ABAQUS软件进行了数值模拟，以定位复合材料风力涡轮机叶片中的损伤。开发的方法基于HASHIN的破坏准则，以检测大型结构的破坏模式并确定最敏感的区域。主要损坏出现在过渡区域，这是复合材料叶片失效的主要原因。此外，发现碳（CC）纤维叶片设计具有更高的强度和刚度，而配置3被认为是最好的，而最佳的叶片位置是冰结构垂直放置时。