摘要
针对某高压输电铁塔上的脚钉在人员登塔时发生断裂问题,采用化学成分、力学性能、宏观、金相以及扫描电镜分析等方法,对的断裂原因进行了研究与分析。研究结果表明,铁塔脚钉的断裂与脚钉的材质质量及加工方法无关,而是由于在施工过程中对脚钉螺栓使用了过大的预紧力,造成了脚钉在螺纹沟底发生了先期开裂,施工时的低温也增大了脚钉脆断倾向。研究结论否定了习惯上只注重在材料质量方面查找断裂失效原因的倾向,强调了严格施工的重要性。
The foot nails,which were installed recently on a high-voltage power iron tower,were broken unexpectedly as the maintenance persons were climbing the iron tower.The failure analyses of the foot nails rupture were conducted by means of the chemical composition,mechanical properties,macrostructure,metallographic,and EDS.The results show that the failure was not caused by their material composition and machining,but resulted from the excessive preload.During the installation of the foot nails,the preload was applied to the screw bolts of the foot nails and caused the pre-crack occurring in the screw thread of the foot nails.In addition,the lower temperature during installation also increased the possibility of the brittle fracture.The results suggest that the inspection of nail material itself only in investigating the rupture of the foot nails is not sufficient.Much attention and inspection should be paid to the installation operation.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2010年第6期1133-1136,共4页
Journal of Liaoning Technical University (Natural Science)
基金
辽宁省科技攻关资助项目(2008219014)
关键词
铁塔脚钉
预紧力
断口
断裂
foot nail for iron tower
preload
fracture
rupture
