Publication result detail

Numerical estimation of the fatigue crack front shape for a specimen with finite thickness

ŠEVČÍK, M.; HUTAŘ, P.; ZOUHAR, M.; NÁHLÍK, L.

Original Title

Numerical estimation of the fatigue crack front shape for a specimen with finite thickness

English Title

Numerical estimation of the fatigue crack front shape for a specimen with finite thickness

Type

Peer-reviewed article not indexed in WoS or Scopus

Original Abstract

An iterative process for the estimation of a fatigue crack front based on linear elastic fracture mechanics using values of the stress singularity exponent is presented. Based on the assumption of a constant stress singularity exponent along the crack front, a numerical approach leading to crack shape determination is suggested and applied. The crack front was approximated by a spline curve. In each node defining the crack front the stress singularity exponent was estimated and a complete crack front shape was found. The difference between thin and thick specimens is then described and discussed. The approach presented leads to better estimation of the crack front shape for structures with different thicknesses and a more accurate determination of fatigue crack fracture parameters. The results presented can be helpful for a better understanding of fatigue failure and more reliable prediction of residual lifetime.

English abstract

An iterative process for the estimation of a fatigue crack front based on linear elastic fracture mechanics using values of the stress singularity exponent is presented. Based on the assumption of a constant stress singularity exponent along the crack front, a numerical approach leading to crack shape determination is suggested and applied. The crack front was approximated by a spline curve. In each node defining the crack front the stress singularity exponent was estimated and a complete crack front shape was found. The difference between thin and thick specimens is then described and discussed. The approach presented leads to better estimation of the crack front shape for structures with different thicknesses and a more accurate determination of fatigue crack fracture parameters. The results presented can be helpful for a better understanding of fatigue failure and more reliable prediction of residual lifetime.

Keywords

crack front shape; vertex singularity; fatigue crack; stress singularity exponent

Key words in English

crack front shape; vertex singularity; fatigue crack; stress singularity exponent

Authors

ŠEVČÍK, M.; HUTAŘ, P.; ZOUHAR, M.; NÁHLÍK, L.

RIV year

2013

Released

09.02.2012

Publisher

Elsevier

ISBN

0142-1123

Periodical

International Journal of Fatigue

Volume

39

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

75

Pages to

80

Pages count

6

BibTex

@article{BUT72898,
  author="Martin {Ševčík} and Pavel {Hutař} and Michal {Zouhar} and Luboš {Náhlík}",
  title="Numerical estimation of the fatigue crack front shape for a specimen with finite thickness",
  journal="International Journal of Fatigue",
  year="2012",
  volume="39",
  number="1",
  pages="75--80",
  issn="0142-1123"
}