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Abstract
As a new type of inorganic green and high performance fiber material, basalt fiber has broad application prospects in the field of offshore wind power. In order to promote the application of basalt fiber in offshore wind turbine blade, the static tensile test and tensile-tensile fatigue test of basalt fiber reinforced polymer (BFRP) at different stress levels were carried out to obtain the elastic modulus, tensile strength, and SN curve of BFRP. The equivalent model of basalt fiber bionic plate and the finite element model of wind turbine blade were established by Ansys Workbench software. Based on nCode software, the fatigue performance of the offshore wind turbine blade with basalt fiber bionic plate was analyzed and its fatigue life was predicted. The results show that the elastic modulus of BFRP is more than 2.5 times that of glass fiber reinforced polymer (GFRP), and BFRP has good plastic energy dissipation capacity. The equivalent model based on equivalent plate theory is suitable for static and dynamic analysis of basalt fiber bionic plate. The fatigue damage of the wind turbine blade under low wind speed is mainly concentrated in the edge of the blade root, the area where the skin and the web intersect and near the tip of the blade. Under the high wind speed, the fatigue damage covered the whole skin, only slight damage occurred at the trailing edge of the tip. The dangerous point is mainly located near the tip of 50 m–60 m along the span direction. The traditional Miner theory can accurately predict the fatigue life of wind turbine blade, and the fatigue life of the wind turbine blade with basalt fiber bionic plate is 29 years, while the fatigue life of the glass fiber wind turbine blade at the same scale is less than 1 year.
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