Effect of Moisture Absorption on Curing of Wind Blades during Repair
Effect of Moisture Absorption on Curing of Wind Blades during Repair
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DOI：
10.1016/j.compositesa.2023.107706
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发表时间：
2023-04
期刊：
影响因子：
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通讯作者：
Sagar P. Shah;M. Olaya;Evgenia Plaka;Joseph McDonald;C. Hansen;M. Maiarù
中科院分区：
文献类型：
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作者：
Sagar P. Shah;M. Olaya;Evgenia Plaka;Joseph McDonald;C. Hansen;M. Maiarù
有效的风力发电机叶片结构修复是降低风能平准化能源成本（LCOE）的关键。在塔上进行的维修对环境条件很敏感，在加工过程中需要考虑环境条件对材料性能的影响，以准确预测维修结果。本研究调查了环境暴露对用于风力涡轮机叶片制造和维修的灌注环氧胺树脂系统的固化动力学的影响，并提供了一个实验验证的有限元工具，用于分析固化周期修复作为修复几何形状和水分含量的函数。对两部分输液系统的吸湿性测试报告了固化剂在高温和相对湿度条件下高达12%的吸湿性。差示扫描量热测量树脂在存在水分显示加速固化行为。修复模型的数值预测与相应的实验室规模修复非常吻合，并揭示了修复斑块内存在大量的温度滞后，这导致了修复程度的热梯度和空间分布。修复几何形状和加速固化动力学对修复内的温度和固化分布有很大影响。所提出的方法可以通过最小化固化时间来减少涡轮机停机时间。
Efficient structural repair of wind turbine blades is essential to reducing the Levelized Cost of Energy (LCOE) for wind energy. Repairs carried out up-tower are sensitive to environmental conditions whose effects on the material properties during processing need to be accounted for to accurately predict the repair outcome. This study investigates the effect of moisture content from environmental exposure on the cure kinetics of an infusion epoxy-amine resin system used in wind turbine blade manufacturing and repair and provides an experimentally validated finite element tool for the analysis of cure cycle repairs as a function of repair geometry and moisture content. Moisture absorption tests on the two-part infusion system reported up to 12% moisture uptake by the curing agent under high temperature and relative humidity conditions. Differential scanning calorimetric measurements of resin in the presence of moisture revealed an accelerated cure behavior. Numerical predictions of a repair model agreed well with the corresponding lab-scale repair and revealed a substantial temperature lag within the repair patch that resulted in thermal gradients and spatial distribution of the degree of cure. The repair geometry and the accelerated-cure kinetics greatly influenced the temperature and cure distribution within the repair. The proposed approach can be used to reduce turbine downtime by minimizing the curing time.