吸湿对风力机叶片维修期间固化的影响
Effect of Moisture Absorption on Curing of Wind Blades during Repair
AI总结：
研究环境暴露导致的含水量对风机叶片灌注树脂固化动力学的影响，提供经实验验证的有限元工具分析维修几何与含水量对固化循环的作用，发现水分加速固化行为并影响温度与固化度分布，旨在最小化固化时间以减少风机停机。
摘要：
风力机叶片的高效结构维修对于限制全球变暖和降低平准化度电成本（LCOE）至关重要。在塔上进行的维修对环境条件敏感，在处理过程中环境条件对材料性能的影响需要被考虑，以准确预测维修结果。本研究调查了环境暴露引起的含水量对风力机叶片制造和维修中使用的灌注树脂体系固化动力学的影响，并提供了一个经过实验验证的有限元工具，用于分析作为维修几何形状和含水量函数的固化循环维修。对双组分灌注体系的吸湿测试报告称，在高温和高相对湿度条件下，固化剂的水分吸收率高达12%。在存在水分的情况下，树脂的差示扫描量热测量揭示了加速的固化行为。维修模型的数值预测与相应的实验室规模维修非常吻合，并揭示了修补区域内存在显著的温度滞后，这导致了热梯度和固化度的空间分布。结果表明，维修几何形状和加速固化动力学极大地影响了维修内部的温度和固化分布。所提出的方法可通过最小化固化时间来减少风机停机时间。
英文摘要：
Efficient structural repair of wind turbine blades is essential to limiting global warming and reducing the Levelized Cost of Energy (LCOE). Repairs carried out up-tower are sensitive to environmental conditions whose effect on the material properties during processing needs 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 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 very well with the corresponding lab-scale repair and revealed a substantial temperature lag within the repair patch which resulted in thermal gradients and spatial distribution of the degree of cure. It was shown that 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.
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