Temperature fluctuations significantly affect the performance and lifespan of composite materials in wind turbine blades through thermal stress, moisture absorption, and degradation of the matrix material. Composite materials, typically fiberglass or carbon fiber reinforced polymers, are used in wind turbine blades for their high strength-to-weight ratio. Thermal stress arises due to the difference in thermal expansion coefficients between the fiber reinforcement and the polymer matrix. The thermal expansion coefficient is a measure of how much a material expands or contracts with changes in temperature. When the temperature changes, the fiber and matrix expand or contract at different rates, creating internal stresses within the composite material. These thermal stresses can lead to microcracking and delamination, reducing the blade's strength and stiffness. Moisture absorption is ....
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