中型玻璃纤维风电叶片静力失效特性分析

Analysis on static failure characteristics of medium glass fiber wind turbine blades

风力机叶片的失效特性分析是保障风力机整机稳定性及其可靠性分析的重要基础。对中国科学院工程热物理研究所研发的100kW中型实验叶片进行了有限元仿真及全尺寸静力实验研究,得出了叶片在不同载荷条件下的挠度特性,重点研究了叶片在大载荷条件下摆振方向的失效特性,结合实验数据及有限元仿真结果对失效危险区域及失效机理进行深入分析,最后确定叶片发生断裂失效原因为大载荷引起的剪切应力造成的纤维层间失效,以及相应引起的树脂材料的连续性退化。

The analysis of failure properties of wind turbine blades is the important foundation for the stability and reliability analysis of the whole machine. By combining the finite element simulation with the full scale static load test, the deflection properties of the 100 kW medium sized experimental blade developed by IET, Chines Academy of Sciences under different load conditions are obtained. The study focuses on the failure properties of blades under large load conditions, and with the experimental data and finite element simulation results, the failure risk area and failure mechanism are analyzed. It is determined that the cause for fracture failure of the blade is the interlayer failure caused by the shear stress under heavy load and the consequential degradation of the resin material.