Publication detail

Fatigue crack shape prediction based on the stress singularity exponent

HUTAŘ, P. ŠEVČÍK, M. NÁHLÍK, L. KNÉSL, Z.

Original Title

Fatigue crack shape prediction based on the stress singularity exponent

Type

journal article - other

Language

English

Original Abstract

In many industrial applications it is necessary to predict fatigue lifetime of the structures, where the stress field near the crack front have a real three-dimensional nature. Due to the existence of vertex singularity in the point where the crack front touches free surface, crack propagation in 3D structures cannot be reduced to a series of plane strain or plane stress problems along the crack front. The paper describes the influence of the vertex singularity on crack shape for three-dimensional structure. The iterative process for estimation of a real crack front based on a stress singularity exponent is presented. The crack front was approximated by a spline curve. In each node defining the crack front the stress singularity exponent has been estimated and complete crack front shape was found. The methodology presented can help to estimate crack front shape in a linear elastic fracture mechanics framework and estimate fracture parameters of fatigue cracks more accurately.

Keywords

stress singularity exponent; crack front curvature; vertex singularity; free surface effect

Authors

HUTAŘ, P.; ŠEVČÍK, M.; NÁHLÍK, L.; KNÉSL, Z.

RIV year

2012

Released

2. 1. 2012

Publisher

Trans Tech Publications

Location

Switzerland

ISBN

1013-9826

Periodical

Key Engineering Materials (print)

Year of study

488-489

Number

-

State

Swiss Confederation

Pages from

178

Pages to

181

Pages count

4

BibTex

@article{BUT74941,
  author="Pavel {Hutař} and Martin {Ševčík} and Luboš {Náhlík} and Zdeněk {Knésl}",
  title="Fatigue crack shape prediction based on the stress singularity exponent",
  journal="Key Engineering Materials (print)",
  year="2012",
  volume="488-489",
  number="-",
  pages="178--181",
  issn="1013-9826"
}