Nowak Andrzej, Strzępek Paweł, Korczak Piotr
Faculty of Non-Ferrous Metals, AGH University of Krakow, 30-059 Krakow, Poland.
Łukasiewicz Research Network-Institute of Non-Ferrous Metals, 32-050 Skawina, Poland.
Materials (Basel). 2025 Sep 1;18(17):4103. doi: 10.3390/ma18174103.
Fatigue failure of overhead line conductors made of AlMgSi alloys is much more complex than fatigue failure of a single wire. The main difference lies in the fretting phenomenon, which is a significant mechanism initiating fatigue damage. It is generated because of micro-movements between individual wires or outer wires and overhead line fittings. Such movements are mainly caused by aeolian vibrations, which lead to degradation of wire surface, initiation of microcracks, and premature failure of multiple wires. Research based on laboratory experiments and modeling studies simulating real operating conditions made it possible not only to identify the mechanisms leading to failure but also to assess the impact of working conditions on their evolution. According to the obtained results, properly selected heat treatment parameters influence both the mass decrease of the wires and number of cycles to failure due to fretting fatigue. Further development of materials, protective coatings, and methods of durability prediction will reduce the impact of fretting on fatigue failure and thus increase the reliability of power lines.
由铝镁硅合金制成的架空线导体的疲劳失效比单根导线的疲劳失效要复杂得多。主要区别在于微动现象，这是引发疲劳损伤的一个重要机制。它是由单根导线之间或外层导线与架空线配件之间的微运动产生的。这种运动主要由风致振动引起，风致振动会导致导线表面退化、微裂纹萌生以及多根导线过早失效。基于实验室实验和模拟实际运行条件的建模研究不仅能够识别导致失效的机制，还能够评估工作条件对其演变的影响。根据所得结果，合理选择的热处理参数会影响导线的质量减少以及由于微动疲劳导致的失效循环次数。材料、防护涂层和耐久性预测方法的进一步发展将减少微动对疲劳失效的影响，从而提高输电线的可靠性。
