Publication detail

The effect of the singularity induced by the free surface on fatigue crack growth in thin structures

HUTAŘ, P. NÁHLÍK, L. KNÉSL, Z.

Czech title

Vliv rohové singularity na šíření trhlin v tenkých tělesech

English title

The effect of the singularity induced by the free surface on fatigue crack growth in thin structures

Type

journal article in Web of Science

Language

en

Original abstract

In many industrial applications is necessary to predict fatigue lifetime of thin 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 touching free surface, crack propagation in 3D structures cannot be reduced to a series of plane strain or plane stress problems along the crack front edge. The paper describes the influence of vertex singularity on the distribution of the stresses around the crack front for three-dimensional body. The distribution of the stress singularity through the thickness of the specimen gives us indication of the crack behavior in thin structures. The estimation of the thickness of the specimen where the change of singularity plays an important role on fatigue crack growth rate (in dependence on Poisson's ratio) is carried out. The results contribute to a better understanding of the crack behavior in thin structures, and can help to more reliable estimates of their residual fatigue life.

Czech abstract

Práce se zabývá vlivem tzv. rohové singularity na šíření únavové trhliny zejména v tenkých tělesech.

English abstract

In many industrial applications is necessary to predict fatigue lifetime of thin 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 touching free surface, crack propagation in 3D structures cannot be reduced to a series of plane strain or plane stress problems along the crack front edge. The paper describes the influence of vertex singularity on the distribution of the stresses around the crack front for three-dimensional body. The distribution of the stress singularity through the thickness of the specimen gives us indication of the crack behavior in thin structures. The estimation of the thickness of the specimen where the change of singularity plays an important role on fatigue crack growth rate (in dependence on Poisson's ratio) is carried out. The results contribute to a better understanding of the crack behavior in thin structures, and can help to more reliable estimates of their residual fatigue life.

Keywords in English

Fatigue crack, vertex singularity, thin structures

RIV year

2008

Released

30.07.2008

Publisher

Trans Tech Publications

Location

Switzerland

ISSN

1013-9826

Journal

Key Engineering Materials

Volume

385-387

Number

385-387

Pages from–to

317–320

Pages count

4

BIBTEX


@article{BUT48301,
  author="Pavel {Hutař} and Luboš {Náhlík} and Zdeněk {Knésl},
  title="The effect of the singularity induced by the free surface on fatigue crack growth in thin structures",
  journal="Key Engineering Materials",
  year="2008",
  volume="385-387",
  number="385-387",
  month="July",
  pages="317--320",
  publisher="Trans Tech Publications",
  address="Switzerland",
  issn="1013-9826"
}