输电线路连接金具疲劳断裂失效分析研究  

Fatigue Fracture Failure of Connection Fittings on Transmission Line

作　　者：韩哲文[1] 蒋楠[1] 蔡文河[1] 王智春[1] 

机构地区：[1]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京100045

出　　处：《华北电力技术》2015年第7期44-49,共6页North China Electric Power

摘　　要：针对输电线路球头球窝型连接金具疲劳断裂失效问题,采用宏观形貌分析、金相组织观察、断口扫描电镜分析对两个不同案例进行了试验研究和理论分析。结果表明连接金具受综合因素作用,外表面薄弱处形成疲劳源,最终导致疲劳失效。并提出了表面质量、结构设计、风载荷为影响连接金具疲劳断裂的关键因素。According to fracture failure problems of the ball head and socket link fittings on transmission line, experi- mental study and theoretical analysis of two eases are carried on based on macroscopical morphology, metallographic and scanning electron microscope analysis. The results showed that the fracture failure of connection fittings was af- fected by comprehensive factors, so that fatigue source was formed at the vulnerable spot on surface, then led to frac- ture. The surface quality, structure design and wind load are pointed to be the key factors of farcture failure of con- nection fittings.

关 键 词：输电线路 连接金具 断裂 疲劳 

分 类 号：TM726.3[电气工程—电力系统及自动化] TG115.2[金属学及工艺—物理冶金]