3.0 MW风机叶片螺栓断裂分析  

Analysis of 3.0 MW Fan Blade Bolt Fatigue

作　　者：陈锐 吴胜峰 CHEN Rui;WU Shengfeng(China Power Huachuang(Suzhou)Electricity Technology Research Co.,Ltd.,Suzhou,Jiangsu 215123,China)

机构地区：[1]中电华创(苏州)电力技术研究有限公司,江苏苏州215123

出　　处：《东北电力技术》2025年第4期23-27,共5页Northeast Electric Power Technology

摘　　要：某3.0 MW风机叶片螺栓断裂,断口表面可见明显疲劳弧线,断裂位置在螺栓螺纹牙底,终断区面积较小,判断为低应力疲劳断裂。对断裂螺栓进行扫描电子显微镜和能量色散X射线光谱分析、化学成分分析、拉伸性能、冲击等一系列试验,均未发现明显异常,判定螺栓断裂与材质本身无直接关系。由螺栓受力分析可知,螺栓与螺母连接处应力集中,成为疲劳裂纹萌生区,当螺栓在交变载荷作用下,螺栓应力集中处萌生疲劳裂纹,最终沿应力最大方向扩展,产生疲劳断裂。3.0 MW fan blade bolt is cracked,and obvious fatigue arc can be seen on its fracture surface.The breaking position is at the bottom of the bolt thread,and the final fatigue area is small,which is judged to be low-stress fatigue crack.A series of tests such as SEM&EDS,chemical composition,tensile properties and impact are carried out to compare the broken bolts and intact bolts.No obvious abnormality is found,and it is determined that the fatigue cause of the failed bolts is not directly related to the material of the parts itself.It can be seen from the stress analysis of bolts that the joints of bolts and nuts are stressed and become the initiation zone of fatigue cracks.When the bolt is subjected to alternating load,fatigue cracks occur at the stress concentration of the bolt,and eventually spread along the maximum direction of stress,resulting in fatigue crack.

关 键 词：叶片螺栓 断裂 疲劳 交变载荷 

分 类 号：TM315[电气工程—电机]