Wind turbine blade life prediction is the most important parameter to estimate the power generation cost. Due to the price and importance of wind blade, many experimental and theoretical methods were developed to estimate damages and blade life. A novel multiaxial fatigue damage model is suggested for the life prediction of a wind turbine blade. Fatigue reduction of fiber and interfiber characteristics are separately treated and simulated in this research. Damage behavior is considered in lamina level and then extended to laminate; hence, this model can be used for multidirectional laminated composites. The procedure of fatigue-induced degradation is implemented in an ABAQUS user material subroutine. By applying the fatigue damage model, life is estimated by the satisfaction of lamina fracture criteria. This model provides a comprehensive idea about how damage happens in wind blades regarding a multi-axis fatigue loading condition.

风力涡轮机叶片寿命预测是估算发电成本的最重要参数。由于风电叶片的价格和重要性，因此开发了许多实验和理论方法来估计风电叶片的损坏和寿命。提出了一种新颖的多轴疲劳损伤模型，用于预测风机叶片的寿命。本研究分别处理和模拟了纤维的疲劳减少和纤维间的特性。破坏行为在层板层面考虑，然后扩展到层压板；因此，该模型可用于多向层压复合材料。疲劳引起的降解的过程在ABAQUS用户材料子例程中实现。通过应用疲劳损伤模型，可以通过满足层板断裂标准来评估寿命。