Investigation into the causes of fracture in railway freight car axle
Apstrakt
Railway axles are vital parts of railway. Their failure in the form of dynamic fracture is commonly of disastrous outcomes for railway vehicles. Accordingly, railway axles are designed to be highly reliable, while the maintenance system requires regular inspection in terms of crack initiation. However, due to complex exploitation conditions, complex stress state and multiple stress concentration, railway axles often experience fatigue failures. This occurrence has been studied in a large number of papers. This paper too sheds light on the causes of fracture occurrence in the axle of railway freight car for coal transport in a thermal power plant. Detailed analyses were conducted on the axle fracture surface and mechanical properties. Also, microstructure of the axle material, as well as on exploitation conditions and stress state was examined. Calculations indicated that, apart from working load impact, the influence of press fit joints, especially of the one between the labyrinth seal... and the axle is of crucial importance for the analysis of railway axle stress state. The entire numerical-experimental analysis has shown that the considered axle failure was caused by inadequate maintenance, insufficient axle strength and adverse stress state in the railway axle critical cross-sections.
Ključne reči:
Stress concentrations / Railway engineering / Non-destructive testing / Finite element analysis / FailurediagnosticsIzvor:
Engineering Failure Analysis, 2015, 55, 169-181Izdavač:
- Pergamon-Elsevier Science Ltd, Oxford
Finansiranje / projekti:
- Razvoj novih metodologija revitalizacije turbinske i hidromehaničke opreme hidroelektrana u zavisnosti od uzroka degradacije materijala (RS-MESTD-Technological Development (TD or TR)-35002)
- Razvoj metodologija za povećanje radne sposobnosti, pouzdanosti i energetske efikasnosti mašinskih sistema u energetici (RS-MESTD-Technological Development (TD or TR)-35029)
- Integritet opreme pod pritiskom pri istovremenom delovanju zamarajućeg opterećenja i temperature (RS-MESTD-Technological Development (TD or TR)-35011)
Napomena:
- Peer reviewed version of the paper: https://machinery.mas.bg.ac.rs/handle/123456789/3933
Povezane informacije:
- Druga verzija
https://machinery.mas.bg.ac.rs/handle/123456789/3933
DOI: 10.1016/j.engfailanal.2015.05.011
ISSN: 1350-6307