含预制缺口的电力导线腐蚀疲劳性能试验  

Experimental study on corrosion fatigue performance of electric wire with machine-cut notches

作　　者：尹恒 王莹[2] 袁飞 郭力[2] YIN Heng;WANG Ying;YUAN Fei;GUO Li(China Energy Engineering Group Jiangsu Power Design Institute Co Ltd,Nanjing 211102,China;School of Civil Engineering,Southeast University,Nanjing,211189,China)

机构地区：[1]中国能源建设集团江苏省电力设计院有限公司,江苏南京211102 [2]东南大学土木工程学院,江苏南京211189

出　　处：《河海大学学报（自然科学版）》2021年第5期466-472,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51678135)。

摘　　要：为了研究腐蚀介质和疲劳荷载两者的耦合作用、腐蚀溶液浓度和pH值等因素对电力导线腐蚀疲劳寿命的影响,设计了一种新型的试验装置对某线路老旧导线进行腐蚀疲劳试验。通过在导线表面预制缺口,研究了不同腐蚀条件、不同腐蚀和疲劳作用方式对含缺陷导线力学性能的影响,得到了各加载工况下的S-N曲线和拟合方程,并分析了腐蚀溶液浓度、pH值对导线寿命的影响权重。试验结果表明:腐蚀介质和疲劳荷载耦合作用下导线寿命比无腐蚀作用时显著降低;随着溶液酸性的增强,导线寿命显著缩短;由于高浓度的氯离子抑制了溶液中氧的溶解及扩散作用,使溶液对导线的腐蚀作用减弱,因此氯离子浓度的改变并非和疲劳寿命呈负相关关系。In order to study the influences of the coupling effect of corrosion medium and fatigue load,concentration and pH value of corrosive solution on the corrosion fatigue life of the electric wire,a new test device was designed to test some old electric wires.By prefabricating the notch on the surface of the electric wire,the effects of different corrosion conditions,corrosive medium and fatigue load on the mechanical properties of the electric wire containing defects were studied.The fatigue S-N curve and fitting equation under different loading conditions were obtained,and the weights of concentration and pH value of corrosive solution on the electric wire life were analyzed respectively.The results show that the electric wire life under the coupling of corrosive medium and fatigue load is significantly lower than that without considering the corrosion action.With the increasing acidity of the solution,the electric wire life is shortened significantly.The high concentration of chlorine ion has a certain inhibitory effect on the dissolution and diffusion of oxygen in the solution,resulting in weakened corrosion effect of solution on electric wires.This indicates that the change of chlorine ion concentration is not negatively correlated with the fatigue life.

关 键 词：电力导线 预制缺口 腐蚀 疲劳 耦合作用 疲劳寿命 

分 类 号：O346.2[理学—固体力学]