钢芯铝绞架空导线微动疲劳断口形貌.pdf

第22卷第1期
中国有色金属学报
2012年1月
The Chinese Journal of Nonferrous Metals
Jan. 20
文章编号:1004-0609(2012)1-0194-07
钢芯铝绞架空导线微动疲劳断口形貌
王煦',陈国宏2,王家庆2,张建堃,张涛2,徐光青,汤文明1
(1.合肥工业大学材料科学与工程学院,合肥230009:2.安徽省电力科学研究院材料所,合肥230601)
摘要:在自制的微动疲劳试验装置上进行钢芯铝绞导线(ACSR)的微动疲劳试验,采用扫描电子显微镜观察分
析内、外层铝股线断口特征,研究其微动疲劳断裂机制。结果表明:铝股线的断股大多发生于导线与线夹的最后
接触点处。微动振幅为1.0mm时,在较低循环周次下(1.6×10),铝股线只发生正断;随着循环次数增加,铝股
线断股数量增加,且发生45°及“V”形断裂。铝股线疲劳断口由疲劳源区、疲劳裂纹扩展区、瞬断区构成,呈现弯
曲疲劳和扭转疲劳两种不同的断裂方式
关键词:钢芯铝绞导线;微动疲劳;疲劳断裂
中图分类号:TH117.3
文献标志码
Fretting fatigue fractographies of
aluminum conductor steel reinforced overhead conductor
WANG Xu, CHEN Guo-hong, WANG Jia-qing ZHANG Jian-kun
ZHANG Tao, XU Guang-qing TANG Wen-ming
(1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Materials Department, Anhui Electric Power Research Institutc, Hefei 230601, China)
bstract: Fretting fatigue experiment of the aluminum conductor steel reinforced(ACSR)conductor was carried out
using a conductor fretting fatigue testing equipment. The fractographies of the external and internal Al strands of the
ACSR conductor were analyzed using scanning electron microscope(SEM), and the fracture mechanisms of the Al
strands after fretting fatigue were also discussed. The results show that the Al strands mostly rupture at the last contact
points of the conductor on the suspension clamp. Under the condition of the fretting amplitude equal to 1.0 mm, only the
plane fracture of the Al strands takes place at low fretting cycles of 1.6X 10. As the fretting cycles increasing from 1.6X
10 to 2.610, the number of the broken Al strands increases, and new facture modes, i.e. the 45. and "V"type
fractures, are detected. All fatigue fracture surfaces of the Al strands consist of three regions, e.g. the fatigue source
region, the fatigue crack extension region and the instant fracture region, respectively. Two fatigue fracture mechanisms
of the Al strands, such as the bending fatigue and the torsional fatigue, are also revealed
Key words: aluminum conductor steel reinforced conductor; fritting fatigue; fatigue fracture
架空导线是高压输电线路的主体,目前,国内外雨、冰雪等恶劣的自然条件,容易发生各种事故,在
高压输配电网架空导线主要是钢芯铝绞导线役架空导线的维护和更新务繁重2?。如何对在役架
( Aluminium conductor steel reinforced,ACSR)。世界空导线的运行状况进行科学评估,成为输电工程及管
范围的架空导线已服役25~40年,处于其寿命的中理的一个研究热点。
期山。由于架空导线长期处于野外露天之下,经受风
一般认为,风致振动导致导线内部股线之间、导
基金项目:国家电网科技攻关项目(200914
收稿日期:201-03-29;修订日期:2011-09-20
通信作者:汤文明,教授,博士:电话:0551-2901373;E-mail:whang69@l26.com