Publication detail

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

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

Czech title

Numerický odhad tvaru čela trhliny u tenkých zkušebních vzorku

English title

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

Type

journal article - other

Language

en

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.

Czech abstract

V práci je popsána navržená metodika odhadu tvaru čela trhliny u tenkých vzorků. Je založena na předpokladu, že rychlost šíření trhliny na čele trhliny je stejná tehdy, když je charakter singularity stejný v každém místě čela trhliny.

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 in Czech

tvar čela trhliny; hranová singularita; únavová trhlina; exponent singularity napětí

Keywords in English

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

RIV year

2012

Released

09.02.2012

Publisher

Elsevier

ISSN

0142-1123

Volume

39

Number

1

Pages from–to

75–80

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",
  year="2012",
  volume="39",
  number="1",
  month="February",
  pages="75--80",
  publisher="Elsevier",
  issn="0142-1123"
}