Publication detail

Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles

POKORNÝ, P. NÁHLÍK, L. HUTAŘ, P.

Original Title

Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles

Type

journal article in Web of Science

Language

English

Original Abstract

Railway axles are subjected to cyclic loading, which could lead to fatigue failure. Therefore, it is desired to know residual fatigue lifetime of railway axles to ensure safe operation of trains. Because of detection of relatively small fatigue cracks is not guaranteed an estimation of residual fatigue lifetime is based on damage tolerance approach. The acting stress ratio is variable due to variable amplitude loading and load caused by existence of press-fitted wheel in the vicinity of assumed crack. The contribution is focused on influence of variable stress ratio in EA4T steel on residual fatigue lifetime of railway axles. The influence of stress intensity factor on fatigue crack propagation rate was experimentally evaluated for three different stress ratios, which correspond to operation conditions. Two different expressions of fatigue crack propagation rate were used and mutually compared to show influence of the stress ratio on residual fatigue lifetime of structure made of EA4T steel. The first expression considers stress intensity factor range (respecting stress ratio R) and the second one uses maximal value of the stress intensity factor. The paper shows ability of both expressions to describe experimental data obtained under different stress ratios and their influence on estimated residual fatigue lifetime values. The results obtained contribute to the better estimation of residual fatigue lifetime of railway axles and generally to the safer rail transportation. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

Keywords

railway axle; stress ratio; EA4T; fatigue crack

Authors

POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P.

Released

1. 1. 2016

Publisher

Elsevier

Location

AMSTERDAM

ISBN

2452-3216

Periodical

Procedia Structural Integrity

Year of study

2

Number

1

State

Republic of Italy

Pages from

3585

Pages to

3592

Pages count

8

URL

https://www.sciencedirect.com/science/article/pii/S2452321616304668

Full text in the Digital Library

http://hdl.handle.net/11012/203118

BibTex

@article{BUT170580,
  author="Pavel {Pokorný} and Luboš {Náhlík} and Pavel {Hutař}",
  title="Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles",
  journal="Procedia Structural Integrity",
  year="2016",
  volume="2",
  number="1",
  pages="3585--3592",
  doi="10.1016/j.prostr.2016.06.447",
  issn="2452-3216",
  url="https://www.sciencedirect.com/science/article/pii/S2452321616304668"
}