【摘要】 随着风电机组服役时间的逐年增长,早期投产的风电机组陆续出现主轴的疲劳断裂事故。本文结合国内某风电场的NTK300风电机组主轴断裂问题,对断裂主轴进行宏观和微观断口分析,结果表明:风电机组主轴在额定工况载荷作用下,虽工作应力水平较低,应力集中不明显,但长期服役后仍可能发生疲劳断裂。同时,通过有限元分析发现,额定工况载荷作用下的主轴在断裂位置处应力分布相对集中。通过主轴高周疲劳断面SEM图片的对比发现,主轴在断裂位置的轴向截面应力分布梯度与某一时刻疲劳裂纹萌生和扩张的方向基本一致。更多还原

【Abstract】 With the growth of service time of the wind turbine,the main shafts have incessantly occurred to fatigue fracture for the early production of wind turbine in China.In this paper,the macro-and micro-fatigue fracture analysis of the main shaft for NTK300 wind turbine in a wind farm is carried out.These results indicated that although the main shaft has a low stress and indistinctive stress concentration under the rated operating condition,the fatigue fracture occurred in the exceed service life.In addition,the finite element (FE) modeling is used to investigate the stress distribution of the fracture location.Comparison with cracking point of high cycle fatigue of main shaft,we can find that there are the same stress gradient and crack extension trends for the FE method and the experiments.更多还原