Detail publikace
Šíření únavové trhliny v ocelích železničních náprav
NÁHLÍK, L. POKORNÝ, P. HUTAŘ, P. MATUŠEK, P.
Český název
Šíření únavové trhliny v ocelích železničních náprav
Anglický název
Fatigue crack propagation in steels for railway axles
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
The paper deals with the influence of order of cycles in the loading block on the fatigue crack growth rate in railway axle. The railway axle can include some cracks from manufacturing process or initiated fatigue cracks from previous operation. It is advantageous to know how the crack will behave during further service of the train to ensure its safe operation. The classical approaches describing the fatigue crack growth do not take into account the effects of overload cycles, which enlarge the plastic zone ahead of the crack tip. The enlarged plastic zone generates residual compressive stresses, which cause a retardation of the fatigue crack growth. Finite element numerical calculations were used together with the generalized Willenborg model to determine influence of overload cycles on the increment of fatigue crack growing in railway axles. Real geometry of the axle, the crack front shape and typical loading spectrum were taken into account.
Český abstrakt
Vlakové nápravy jsou vystaveny proměnlivému zatěžování během provozu. Článek se zabývá vlivem pořadí zátěžných tříd amplitud napětí na velikost přírůstku délky trhliny za jeden zátěžný blok. Pro zahrnutí interakčních efektů byl použit zobecněný Willenborgův model. V článku jsou uvažovány dva často používané materiály pro železniční nápravy, oceli EA1N a EA4T.
Anglický abstrakt
The paper deals with the influence of order of cycles in the loading block on the fatigue crack growth rate in railway axle. The railway axle can include some cracks from manufacturing process or initiated fatigue cracks from previous operation. It is advantageous to know how the crack will behave during further service of the train to ensure its safe operation. The classical approaches describing the fatigue crack growth do not take into account the effects of overload cycles, which enlarge the plastic zone ahead of the crack tip. The enlarged plastic zone generates residual compressive stresses, which cause a retardation of the fatigue crack growth. Finite element numerical calculations were used together with the generalized Willenborg model to determine influence of overload cycles on the increment of fatigue crack growing in railway axles. Real geometry of the axle, the crack front shape and typical loading spectrum were taken into account.
Klíčová slova česky
vlaková náprava, retardační efekt, proměnné zatěžování, zobecněný Willinborgův model
Klíčová slova anglicky
railway axle, crack retardation, variable loading amplitude, generalized Willenborg model.
Rok RIV
2014
Vydáno
06.01.2014
ISSN
1013-9826
Ročník
2014
Číslo
592-593
Strany od–do
254–257
Počet stran
4
BIBTEX
@article{BUT101681,
author="Luboš {Náhlík} and Pavel {Pokorný} and Pavel {Hutař} and Petr {Matušek},
title="Fatigue crack propagation in steels for railway axles",
year="2014",
volume="2014",
number="592-593",
month="January",
pages="254--257",
issn="1013-9826"
}