Detail publikace
Vliv proměnného zatěžování na zbytkovou únavovou životnost železničních dvojkolí
POKORNÝ, P. NÁHLÍK, L. ŠEVČÍK, M. HUTAŘ, P.
Český název
Vliv proměnného zatěžování na zbytkovou únavovou životnost železničních dvojkolí
Anglický název
Effects of variable loading on residual fatigue life of the railway wheelset
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
The paper deals with the effects of variable loading on residual fatigue life of the railway wheelset. The railway wheelsets can include some cracks created during manufacturing process or during previous operation. Therefore, it is important to know how the existing cracks will behave during further service of the train. The experiments show that the fatigue crack growth rate depends not only on size of the load amplitudes in a loading spectrum, but it depends also on the sequence of load amplitudes. Taking into account interaction effects of overloading cycles requires use a method that calculates increments of crack length in each cycle, i.e. cycle-by-cycle. One of such methods represents generalized Willenborg model. This model was used for residual fatigue life time estimations of railway wheelset and results obtained were compared with classical approach, which did not take into account interaction effects. Results obtained can be used for establishing of service intervals of railway wheelsets.
Český abstrakt
Vlakové nápravy jsou vystaveny proměnlivému zatěžování během provozu. Článek se zabývá vlivem pořadí zátěžných amplitud napětí na zbytkovou únavovou životnost železničních dvojkolí. 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 effects of variable loading on residual fatigue life of the railway wheelset. The railway wheelsets can include some cracks created during manufacturing process or during previous operation. Therefore, it is important to know how the existing cracks will behave during further service of the train. The experiments show that the fatigue crack growth rate depends not only on size of the load amplitudes in a loading spectrum, but it depends also on the sequence of load amplitudes. Taking into account interaction effects of overloading cycles requires use a method that calculates increments of crack length in each cycle, i.e. cycle-by-cycle. One of such methods represents generalized Willenborg model. This model was used for residual fatigue life time estimations of railway wheelset and results obtained were compared with classical approach, which did not take into account interaction effects. Results obtained can be used for establishing of service intervals of railway wheelsets.
Klíčová slova česky
zatěžování proměnnou amplitudou, zbytková únavová životnost, zobecněný Willenborgův model, únavová trhlina, železniční dvojkolí
Klíčová slova anglicky
variable amplitude loading, residual fatigue life, generalized Willenborg model, fatigue crack, railway wheelset
Rok RIV
2013
Vydáno
23.09.2013
ISSN
1013-9826
Ročník
2014
Číslo
577-578
Strany od–do
121–124
Počet stran
4
BIBTEX
@article{BUT101722,
author="Pavel {Pokorný} and Luboš {Náhlík} and Martin {Ševčík} and Pavel {Hutař},
title="Effects of variable loading on residual fatigue life of the railway wheelset",
year="2013",
volume="2014",
number="577-578",
month="September",
pages="121--124",
issn="1013-9826"
}