Fatigue and damage tolerance assessment of induction hardened S38C axles under different foreign objects

•Various types of FODs were created by cubical projectiles and damage mechanism was studied.•Influences of FODs on fatigue strength of S38C axles were explored.•Fatigue properties of S38C axle specimens with FODs were analyzed using K–T diagram.•Damage tolerance of S38C axles was assessed based on t...

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Bibliographic Details
Published in:International journal of fatigue 2021-08, Vol.149, p.106276, Article 106276
Main Authors: Gao, Jie-Wei, Yu, Ming-Hua, Liao, Ding, Zhu, Shun-Peng, Han, Jing, Lesiuk, Grzegorz, Correia, José A.F.O., De Jesus, Abílio M.P.
Format: Article
Language:English
Subjects:
Compressed gas
Cubical projectile
Damage assessment
Damage tolerance
Fatigue failure
Fatigue strength
Gas guns
High speed rail
Impact damage
Induction hardening
Materials fatigue
Morphology
Performance degradation
Projectiles
Railway axle
S38C steel
Shafts (machine elements)
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Summary:•Various types of FODs were created by cubical projectiles and damage mechanism was studied.•Influences of FODs on fatigue strength of S38C axles were explored.•Fatigue properties of S38C axle specimens with FODs were analyzed using K–T diagram.•Damage tolerance of S38C axles was assessed based on the damage depth. Surface damages caused by the impact of flying objects are important factors responsible for fatigue performance degradation of high-speed railway axles, both qualitative and quantitative assessment of these damages are necessary for the maintenance of these axles. In this paper, cubical projectiles were used to reproduce actual damages on S38C axle specimens by a compressed-gas gun at varying velocities. Morphologies of simulated impact damages were characterized, and fatigue strengths of specimens under different impact damages were determined by the step-loading method. Results show that fatigue strength of impacted specimens reduces with the increase of damage depth; besides, other factors, including damage orientation, damage shape, and microstructural damage also exert their contributions. Finally, evaluation on fatigue strength reduction has been performed based on the damage tolerance philosophy.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106276