Under droplet impingement, surface leading edge protection (LEP) coating materials for wind turbine blades develop high-rate transient pressure build-up and a subsequent relaxation in a range of strain rates. The stress-strain coating LEP behavior at a working frequency range depends on the specific LEP and on the material and operational conditions, as described in this research in a previous work. Wear fatigue failure analysis, based on the Springer model, requires coating and substrate speed of sound measurements as constant input material parameters. It considers a linear elastic response of the polymer subjected to drop impact loads, but does not account for the frequency dependent viscoelastic effects for the materials involved. The model has been widely used and validated in the literature for different liquid impact erosion problems. In this work, it is shown the appropriate definition of the viscoelastic materials properties with ultrasonic techniques. It is broadly used for developing precise measurements of the speed of sound in thin coatings and laminates. It also allows accurately evaluating elastic moduli and assessing mechanical properties at the high frequencies of interest. In the current work, an investigation into various LEP coating application cases have been undertaken and related with the rain erosion durability factors due to suitable material impedance definition. The proposed numerical procedures to predict wear surface erosion have been evaluated in comparison with the rain erosion testing, in order to identify suitable coating and composite substrate combinations. LEP erosion performance at rain erosion testing (RET) technique is used widely in the wind industry as the key metric, in an effort to assess the response of the varying material and operational parameters involved.

中文翻译：

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风力涡轮机叶片的顶部涂层抗腐蚀性能分析，取决于相对声阻抗。第2部分：材料表征和雨蚀测试评估

在液滴撞击下，用于风力涡轮机叶片的表面前缘保护（LEP）涂层材料会形成高速率的瞬态压力，并随后在一定的应变速率范围内松弛。如先前研究中的研究所述，在工作频率范围内的应力应变涂层LEP行为取决于特定的LEP以及材料和操作条件。基于Springer模型的磨损疲劳失效分析需要将涂层和基材的声音测量速度作为恒定的输入材料参数。它考虑了承受跌落冲击载荷的聚合物的线性弹性响应，但没有考虑所涉及材料的频率依赖性粘弹性效应。该模型已针对各种液体冲击腐蚀问题得到了广泛使用和验证。在这项工作中，它显示了超声技术对粘弹性材料性能的适当定义。它广泛用于开发薄涂层和层压板中声速的精确测量。它还可以在感兴趣的高频下准确评估弹性模量并评估机械性能。在当前的工作中，已经对各种LEP涂料应用案例进行了调查，并且由于合适的材料阻抗定义，这些案例与雨水侵蚀耐久性因素有关。为了确定合适的涂料和复合基材组合，已对拟议的预测磨损表面侵蚀的数值程序与雨水侵蚀测试进行了评估。