Detail publikačního výsledku

Fatigue crack shape prediction based on the stress singularity exponent

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

Originální název

Fatigue crack shape prediction based on the stress singularity exponent

Anglický název

Fatigue crack shape prediction based on the stress singularity exponent

Druh

Článek recenzovaný mimo WoS a Scopus

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

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

Klíčová slova v angličtině

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

Autoři

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

Rok RIV

2016

Vydáno

02.01.2012

Nakladatel

Trans Tech Publications

Místo

Switzerland

ISSN

1013-9826

Periodikum

Key Engineering Materials (print)

Svazek

488-489

Číslo

-

Stát

Švýcarská konfederace

Strany od

178

Strany do

181

Strany počet

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"
}