Crack closure in near-threshold fatigue crack propagation in railway axle steel EA4T

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00481653" target="_blank" >RIV/68081723:_____/17:00481653 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.engfracmech.2017.02.013" target="_blank" >http://dx.doi.org/10.1016/j.engfracmech.2017.02.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.engfracmech.2017.02.013" target="_blank" >10.1016/j.engfracmech.2017.02.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Crack closure in near-threshold fatigue crack propagation in railway axle steel EA4T

Popis výsledku v původním jazyce

The paper is focused on fatigue crack propagation in the threshold area of the EA4T railwaynaxle steel. Railway axles represent one of the most critical components for safety of trains.nThe main aim of this paper is to describe fatigue crack closure mechanisms in EA4T, whichnsignificantly influence the threshold value – a crucial parameter for determination of resid-nual fatigue lifetime of railway axles. Investigated fatigue crack closure mechanisms are:nplasticity induced crack closure, roughness-induced crack closure and oxide-induced cracknclosure. One part of this paper is focused on comparison of crack closure determined bynNASGRO relationship (including plasticity induced crack closure mechanism only) withnthe experimentally obtained one. Difference between these two approaches is explainednby presence of roughness and oxide induced crack closure. Based on theoretical models dif-nferent sources of fatigue crack closure mechanisms was separated and evaluated. The sig-nnificance of oxide-induced crack closure was confirmed based on experimentalnmeasurement of fatigue crack propagation in low humidity air. Finally, the effect of anreduced threshold value in low-humidity air on residual fatigue lifetime of railway axlesnis demonstrated.

Název v anglickém jazyce

Crack closure in near-threshold fatigue crack propagation in railway axle steel EA4T

Popis výsledku anglicky

The paper is focused on fatigue crack propagation in the threshold area of the EA4T railwaynaxle steel. Railway axles represent one of the most critical components for safety of trains.nThe main aim of this paper is to describe fatigue crack closure mechanisms in EA4T, whichnsignificantly influence the threshold value – a crucial parameter for determination of resid-nual fatigue lifetime of railway axles. Investigated fatigue crack closure mechanisms are:nplasticity induced crack closure, roughness-induced crack closure and oxide-induced cracknclosure. One part of this paper is focused on comparison of crack closure determined bynNASGRO relationship (including plasticity induced crack closure mechanism only) withnthe experimentally obtained one. Difference between these two approaches is explainednby presence of roughness and oxide induced crack closure. Based on theoretical models dif-nferent sources of fatigue crack closure mechanisms was separated and evaluated. The sig-nnificance of oxide-induced crack closure was confirmed based on experimentalnmeasurement of fatigue crack propagation in low humidity air. Finally, the effect of anreduced threshold value in low-humidity air on residual fatigue lifetime of railway axlesnis demonstrated.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

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 periodika

Engineering Fracture Mechanics

ISSN

0013-7944

e-ISSN

—

Svazek periodika

185

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

2-19

Kód UT WoS článku

000415941400002

EID výsledku v databázi Scopus

2-s2.0-85014200648