Comparison of different load spectra on residual fatigue lifetime of railway axle

0434930 - ÚFM 2015 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Pokorný, Pavel - Náhlík, Luboš - Hutař, Pavel
Comparison of different load spectra on residual fatigue lifetime of railway axle.
XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17). Amsterdam: Elsevier, 2014 - (Gulagliano, M.; Vergani, L.), s. 313-316. Procedia Engineering, 74. ISSN 1877-7058.
[ICMFM 2014 International Colloquium on Mechanical Fatigue of Metals /17./. Verbania (IT), 25.06.2014-27.06.2014]
Grant CEP: GA MŠMT EE2.3.20.0197
Institucionální podpora: RVO:68081723
Klíčová slova: railway axle * residual fatigue lifetime * fatigue crack * load spectrum * EA1N * EA4T
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The railway axles are subjected to variable amplitude loading. The variability is caused by many different regimes of train operation. The dominant load is caused by the weight of the vehicle, which generates rotary bending during train movement. Nevertheless, there are additional forces, which are generated when train goes through curved track, over crossovers, switches, rail joints etc. Present non-destructive defectoscopy can reliably detect only relatively long cracks (approximately 2 mm long or longer). Hence there is a risk that the existing crack is not detected. Therefore, for conservative estimation of the residual fatigue lifetime the railway axle with a crack should be considered. The behaviour of the crack depends on load spectrum of railway axle. Hence for accurate determination of residual fatigue lifetime of the railway axle is necessary to know representative load spectrum. This paper compares several measured load spectra of railway axles, which are available in the literature. The effect of different load spectra is shown on two widely used materials for railway axles: EA1N and EA4T steels. Obtained results could be used for safer operation of railway axles.
Trvalý link: http://hdl.handle.net/11104/0238921