Publication detail

Influence of different crack propagation rate descriptions on the residual fatigue lifetime of railway axles

POKORNÝ, P. NÁHLÍK, L. HUTAŘ, P.

Original Title

Influence of different crack propagation rate descriptions on the residual fatigue lifetime of railway axles

Type

journal article in Scopus

Language

English

Original Abstract

The paper deals with an estimation of the residual fatigue lifetime of the railway axles. The railway axles can include some cracks either from manufacturing process or from previous loading operation. Because of cyclic loading of the railway axles there is a risk of fatigue failure of the railway axles with unacceptable consequences. Based on this fact, for conservative establishment of the residual fatigue lifetime of the railway axle is necessary to consider an existing crack in the railway axle during design process. The fatigue lifetime estimation of railway axles is very sensitive to used crack propagation rate description (e.g. v-K curve). Typical bending of this curve (knee) can be found in the vicinity of the threshold value in fatigue crack propagation rate dependence (typically v-K curve expressed in log-log coordinates). For accurate estimation of residual fatigue lifetime of the railway axle is necessary to use approximation of v-K curve that takes into account existence of the knee close to the threshold value of the stress intensity factor. The paper shows important differences between different crack propagation rate descriptions on the residual fatigue lifetime estimation of the railway axles. Results obtained can be used for safer design and operation of the railway axles.

Keywords

residual fatigue lifetime, fatigue crack, fatigue crack propagation, railway axle

Authors

POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P.

RIV year

2015

Released

30. 1. 2015

ISBN

1013-9826

Periodical

Key Engineering Materials (print)

Year of study

627

Number

627

State

Swiss Confederation

Pages from

469

Pages to

472

Pages count

4

BibTex

@article{BUT110629,
  author="Pavel {Pokorný} and Luboš {Náhlík} and Pavel {Hutař}",
  title="Influence of different crack propagation rate descriptions on the residual fatigue lifetime of railway axles",
  journal="Key Engineering Materials (print)",
  year="2015",
  volume="627",
  number="627",
  pages="469--472",
  doi="10.4028/www.scientific.net/KEM.627.469",
  issn="1013-9826"
}