摘要
整体吊弦在服役过程中在接触线吊弦线夹端的心形环处容易发生吊弦线断丝、断股现象。通过宏观观察、化学成分分析、微观断口分析、金相组织检测等手段,对整体吊弦的该种失效原因进行分析,结果表明:应力腐蚀疲劳是导致整体吊弦线发生断丝、断股的主要原因;在应力和腐蚀介质的共同作用下,吊弦线铜丝侧表面出现腐蚀坑,随后在交变应力及腐蚀介质的持续作用下发展成为疲劳裂纹源区,最终导致断丝断股。
The breaking of wires or breaking of strands on the shackle at the sharp end of the dropper clamp of contact wire is likely to occur during the service of integral dropper.The causes of failure of the integral dropper are analyzed by means of macroscopic observation,chemical composition analysis,microscopic fracture analysis,and metallographic structure inspection.The results showed that stress corrosion fatigue is a key factor to cause the breaking of wires and strands of the integral dropper.Under the combined action of stress and corrosive medium,corrosion pits appear on the surface of the copper wire side of dropper wire.A fatigue crack source area is gradually formed under the continuous action of alternating stress and corrosive medium,and it will lead to breaking of wires and strands wire ultimately.
出处
《电气化铁道》
2023年第S01期163-168,共6页
Electric Railway
基金
中国铁道科学研究院集团有限公司科研项目“接触网典型零部件的大气环境腐蚀试验方法研究”(2021YJ150)。
关键词
整体吊弦
断丝
断股
应力腐蚀
疲劳
integral dropper
breaking of wire
breaking of strand
stress corrosion
fatigue
