Some important experimental details during verification of fatigue durability of railway axles and wheelsets

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Some important experimental details during verification of fatigue durability of railway axles and wheelsets

Popis výsledku v původním jazyce

Railway wheelsets are crucial components of bogies from the viewpoint of service reliability and safety. They are compound of two subcomponents, wheels and axle, connected to each other by press fitting or shrink fitting. Wheelsets are components extremely dynamically loaded in service, by a very high number of cycles, usually more than 109 during the life. That is why fatigue resistance of these components have to be adequately proved during the certification process, when such proves are strictly requested Two or three characteristics are defined in the standards, which have to be proved, namely (i) fatigue resistance of the smooth part of the axle body on its free surface, so called characteristics F1 and (ii) fatigue resistance under press fit (or shrink fit) - characteristics F3. This contribution describes a new experimental approach to verification of press fitting quality and homogeneity by measurement of mutual circumferential displacements between the axle and wheel hub during the full scale fatigue test. Though the press fit of the tested wheelset met standard requirements for the press fitting diagram in terms of minimum and maximum forces, the mutual microscopic displacements under the press fit were not homogeneous for the whole circumference, the maximum value being almost twice as much higher than the minimum one. Another effect was a dependence of these displacements on number of cycles during rotating bending fatigue tests. The results are discussed considering circumferential dynamic stresses on the axle surface. © 2017 Technical University of Košice - Faculty of Mechanical Engineering

Název v anglickém jazyce

Some important experimental details during verification of fatigue durability of railway axles and wheelsets

Popis výsledku anglicky

Railway wheelsets are crucial components of bogies from the viewpoint of service reliability and safety. They are compound of two subcomponents, wheels and axle, connected to each other by press fitting or shrink fitting. Wheelsets are components extremely dynamically loaded in service, by a very high number of cycles, usually more than 109 during the life. That is why fatigue resistance of these components have to be adequately proved during the certification process, when such proves are strictly requested Two or three characteristics are defined in the standards, which have to be proved, namely (i) fatigue resistance of the smooth part of the axle body on its free surface, so called characteristics F1 and (ii) fatigue resistance under press fit (or shrink fit) - characteristics F3. This contribution describes a new experimental approach to verification of press fitting quality and homogeneity by measurement of mutual circumferential displacements between the axle and wheel hub during the full scale fatigue test. Though the press fit of the tested wheelset met standard requirements for the press fitting diagram in terms of minimum and maximum forces, the mutual microscopic displacements under the press fit were not homogeneous for the whole circumference, the maximum value being almost twice as much higher than the minimum one. Another effect was a dependence of these displacements on number of cycles during rotating bending fatigue tests. The results are discussed considering circumferential dynamic stresses on the axle surface. © 2017 Technical University of Košice - Faculty of Mechanical Engineering

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Conference Proceeding

ISBN

978-805533167-6

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

186 - 192

Název nakladatele

Technical University of Kosice

Místo vydání

Košice

Místo konání akce

Nový Smokovec

Datum konání akce

30. 5. 2017

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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