Detail publikace

Influence of heat treatment-induced residual stress on residual fatigue life of railway axles

POKORNÝ, P. DLHÝ, P. PODUŠKA, J. FAJKOŠ, R. VOJTEK, T. NÁHLÍK, L. GRASSO, M. HUTAŘ, P.

Originální název

Influence of heat treatment-induced residual stress on residual fatigue life of railway axles

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Assessment of residual fatigue life of railway axles commonly does not include effect of residual stress. This paper presents advanced methodology for estimation of residual fatigue life of railway axles considering not only external loading but also internal residual stresses. The studied axles made of the EA4T steel were treated by induction hardening in order to generate very high compressive residual stress in the surface layer of the axle. Such residual stress has positive effect on behaviour of surface defects and leads to fatigue crack retardation or even crack arrest and, consequently, to immense prolongation of residual fatigue life. Experimentally measured data of residual stress were implemented in a numerical model in order to determine the true stress state in the axle. The model included a crack and took the effects of bending, press fit and residual stress into account. Residual fatigue life was calculated for various starting crack lengths based on the experimentally determined da/dN-Delta K curves for various load ratios. Finally, the results for axles hardened by standard method and by induction hardening were compared with residual fatigue lives obtained experimentally from fatigue tests on real railway axles with artificial cracks. The calculated values were conservative with good agreement with experimental data.

Klíčová slova

Railway axle; Fatigue life prediction; Residual stress; Fatigue crack propagation; Hardening

Autoři

POKORNÝ, P.; DLHÝ, P.; PODUŠKA, J.; FAJKOŠ, R.; VOJTEK, T.; NÁHLÍK, L.; GRASSO, M.; HUTAŘ, P.

Vydáno

1. 10. 2020

Nakladatel

ELSEVIER

Místo

AMSTERDAM

ISSN

0167-8442

Periodikum

Theoretical and Applied Fracture Mechanics

Ročník

109

Číslo

1

Stát

Nizozemsko

Strany od

1

Strany do

13

Strany počet

13

URL

https://www.sciencedirect.com/science/article/pii/S0167844220303086?via%3Dihub

BibTex

@article{BUT166186,
  author="Petr {Pokorný} and Pavol {Dlhý} and Jan {Poduška} and Rostislav {Fajkoš} and Tomáš {Vojtek} and Luboš {Náhlík} and Marzio {Grasso} and Pavel {Hutař}",
  title="Influence of heat treatment-induced residual stress on residual fatigue life of railway axles",
  journal="Theoretical and Applied Fracture Mechanics",
  year="2020",
  volume="109",
  number="1",
  pages="1--13",
  doi="10.1016/j.tafmec.2020.102732",
  issn="0167-8442",
  url="https://www.sciencedirect.com/science/article/pii/S0167844220303086?via%3Dihub"
}