Review on Ultra-High-Cycle Fretting Fatigue Damage Mechanism of Press-Fitted Structure of Wheel Axles

Authors

  • Xiaoling Shi Department of Resources and Mechanical Engineering, Lyuliang University, Lvliang, China
  • Ning Wang Department of Resources and Mechanical Engineering, Lyuliang University, Lvliang, China
  • Debao Hu Department of Resources and Mechanical Engineering, Lyuliang University, Lvliang, China

DOI:

https://doi.org/10.54097/w9mmk873

Keywords:

EMU wheel axle, interference press-fitting, fretting fatigue, ultra-high-cycle fatigue, micro-slip, damage evolution, life prediction, interface coupling damage

Abstract

As the core load-bearing components of high-speed train running gears, electric multiple unit (EMU) wheel axles are generally connected by interference press-fitting, and their service reliability directly determines the train operation safety. During the long-term high-frequency and long-mileage service of EMUs, the press-fit interface of wheel axles generates micron-scale reciprocating micro-slip under the coupling effect of rotating bending alternating load, wheel-rail impact load and random line vibration, inducing coupled damage of fretting wear and fretting fatigue. Different from conventional mechanical fatigue, the cumulative service load cycles of wheel axles can reach 108~109 in the ultra-high-cycle range. The fretting effect completely eliminates the traditional fatigue limit of steel materials, and concealed multi-source short cracks continuously initiate and propagate under low-stress and ultra-high-cycle conditions, which is extremely easy to cause sudden failure of wheel axles without obvious precursors. This paper systematically summarizes the interface zoning characteristics, macroscopic failure laws and microscopic damage evolution mechanisms of ultra-high-cycle fretting fatigue of press-fitted EMU wheel axles. The domestic and foreign research progress is reviewed from four dimensions including experimental characterization, numerical simulation, life prediction and anti-damage technology. Furthermore, the key scientific and engineering problems in current research, such as the wear-crack competition mechanism, scale effect, random load damage accumulation and early damage identification are deeply analyzed. Combined with the operation and maintenance requirements of high-speed trains, the future development directions of multi-scale mechanism research, load-adaptive life models, intelligent simulation and active protection technology are clarified. This study aims to improve the theoretical system of ultra-high-cycle fretting fatigue of high-speed wheel axles, and provide theoretical support and technical reference for structural optimization, assembly process upgrading, service damage evaluation and full-life-cycle safety operation and maintenance of EMU wheel axles.

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Published

01-09-2026

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