为了推动玄武岩纤维在海上风机叶片中的应用,对玄武岩纤维增强树脂复合材料（BFRP）进行了拉伸试验和拉-拉疲劳试验,研究了不同纤维增强复合材料的疲劳性能差异。采用nCode软件建立了玄武岩纤维风机叶片（新型叶片）的有限元模型,分析了新型叶片在4 m/s和8 m/s这两种代表性工况下的疲劳损伤情况,采用MATLAB软件编制了雨流计数程序并验证了其可靠性。结果表明,BFRP的弹性模量约为玻璃纤维增强复合材料（GFRP）的2.5倍以上,相同的应力水平下,BFRP的疲劳寿命普遍长于玻璃纤维增强复合材料（GFRP）,但短于碳纤维增强复合材料（CFRP）。在低风速场中,新型叶片大部分的疲劳损伤主要集中在叶根边缘、蒙皮与腹板交接的区域和叶尖附近。在高风速场中,疲劳损伤迅速蔓延至整个蒙皮,仅叶尖后缘处发生轻微损伤。疲劳性能优化可优先考虑加强叶根或沿跨度方向50~60 m的叶尖附近。
Abstract
In order to promote the application of basalt fiber in offshore wind turbine blades, tensile tests and tensile-tensile fatigue tests of basalt fiber reinforced polymer were carried out. The fatigue performance differences among various fiber reinforced composites were researched. A finite element model of the basalt fiber wind turbine blade （new type blade） was established using nCode, and the fatigue damage of the new type blade under two representative working conditions of 4 m/s and 8 m/s was analyzed. A rain flow counting program was compiled by MATLAB and its reliability was verified. The elastic modulus of BFRP is about 2.5 times that of glass fiber reinforced polymer （GFRP）. At the same stress level, the fatigue life of BFRP is generally stronger than that of GFRP but weaker than that of CFRP. In a low wind speed field, most of the fatigue damage of the new type blade is mainly concentrated at the edge of the blade root, the area where the skin and the web are connected,and near the blade tip. In a high wind speed field, fatigue damage rapidly spreads to the entire skin, with only slight damage occurring at the trailing edge of the tip. Optimization of fatigue performance can prioritize strengthening the blade root or the region near the tip of 50-60 m along the span direction.
关键词
玄武岩纤维 /
风机叶片 /
疲劳性能 /
有限元分析
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Key words
basalt fiber /
wind turbine blade /
fatigue performance /
finite element analysis
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参考文献
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