针对风力机叶片在随机载荷作用下有效评估疲劳寿命问题,提出一种描述典型玻璃纤维增强复合材料（GRP）等寿命疲劳极限模型,与3种经典模型进行对比分析,并指出GRP在拉伸和压缩阶段损伤累积方式存在差异,反映出等寿命疲劳极限曲线并不对称且呈钟形形状,对比分析该模型在应力-寿命数据中的预测效果。通过ANSYS软件建立风力机叶片数值仿真模型,分析随机载荷平均应力和应力幅值双参数随机变量特征,采用试验数据拟合风力机叶片复合材料应力-寿命曲线量化损伤,最终应用Miner线性疲劳损伤累积法则对各循环损伤进行累积计算总疲劳寿命,结果验证了该模型在利用仿真数据预测风力机叶片疲劳寿命的合理性。
Abstract
A constant life fatigue limit model, which describes typical glass fiber reinforced plastics （GRP）, was proposed and compared with three classical models to effectively evaluate fatigue life of wind turbine blades under random loads. It also pointed out that GRP had different damage accumulation modes in the tensile stage and the compression stage, reflecting that the constant life fatigue limit curve is not symmetric, but looks like a clock. The prediction effect of the proposed model in the stress-life data was compared and analyzed. In additon, ANSYS software was used to establish a numerical simulation model of wind turbine blade. The random variation characteristics of the mean stress and stress amplitude under random load were analyzed. Apart from that, the experimental data were used to fit the quantitative damages of the stress-life curve of the wind turbine blade composite. Finally, through the Miner linear fatigue damage accumulation method, damages in all cycles were accumulated to calculate the total fatigue life. Based on the simulation data, results verified the reasonability of the proposed model in predicting fatigue life of wind turbine blade.
关键词
风力机叶片 /
复合材料 /
有限元分析 /
等寿命疲劳极限模型 /
随机载荷
Key words
wind turbine blades /
composite /
finite element analysis /
constant life fatigue limit model /
random load
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基金
国家自然科学基金（52165019）; 内蒙古自然科学基金（2019MS05063）
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