扭转微动多冲疲劳失效初论

2台分别使用了2、10 a的功率为2986 kW的减速机，先后因高速轴表面剥裂和断裂而失效。通过对其形貌观察和断口分析可知，该失效均与微动磨损、微动冲击和疲劳损伤有关，且是一种少见的轴?毂疲劳失效模式。剥裂失效的轴未断裂，而是沿轴的圆周深层疲劳剥落。断裂失效的轴，其断口具有复杂的碎裂形貌，很难对断口发生的原因进行分析。轴的剥裂和断裂失效模式目前尚无理论解释。本研究将2种失效模式称之为扭转微动多冲疲劳失效，国内外尚无相关研究内容，有必要进一步研究和探讨扭转微动多冲疲劳失效的原因和失效机理，从而提出相应的预防措施。

Preliminary Discussion on Torsional Fretting Multi-impact Fatigue Failure

Two reducers with power of 2986 kW that used 2 and 10 years respectively, failed successively due to surface peeling and fracture of high-speed shaft. After appearance observation and macro fracture analysis, it is believed that the failure of the two reducers’ high-speed shafts is caused by fretting wear, fretting impact and fatigue damage, which is a very rare shaft-hub fatigue failure mode. The failed shaft does not fracture, but the deep circular fatigue peeling along the shaft. The fracture failure shaft has very complex fracture morphology, so it is difficult to analyze the cause of the fracture. The peeling and fracture failure mode of the shaft can not be explained theoretically. In this study, the failure mode of the above two fractures is called the torsional fretting multi-impact fatigue. There is no relevant research reported at home and abroad. It is necessary to further study and discuss the causes and failure mechanism of torsional fretting multi impact fatigue failure, thus propose corresponding preventive measures.