Detail publikace

The effect of a free surface on fatigue crack behaviour

HUTAŘ, P. NÁHLÍK, L. KNÉSL, Z.

Originální název

The effect of a free surface on fatigue crack behaviour

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

The effect of a free surface on fatigue crack behaviour is discussed in the paper and generalized stress intensity factor methodology is used for a reliable estimation of the fatigue crack propagation rate in the area close to a free surface, where the effect of vertex singularity is important. It is shown that a decrease in the stress singularity exponent close to the vertex point leads to a decrease in the fatigue crack propagation rate and contributes to a typical curved crack front shape. The numerical estimations of the crack shape correspond well with experimental observations taken from the literature. Further change of the stress singularity exponent for thin structures was studied on M(T) specimens with different thicknesses. The proposed methodology facilitates explanation of the experimentally observed decrease in the fatigue crack propagation rate (FCPR) for thin structures. It is shown, that decrease of FCPR depends on Poisson's ratio and parameters of the Paris - Erdogan law for corresponding materials. These results can at least partially explain the effect of a free surface on fatigue crack behaviour and help towards a more reliable estimation of the residual fatigue lifetime of the structures considered.

Klíčová slova

Vertex singularity; Generalized stress intensity factor; Stress singularity; Fatigue crack; V-notch

Autoři

HUTAŘ, P.; NÁHLÍK, L.; KNÉSL, Z.

Rok RIV

2010

Vydáno

1. 8. 2010

Nakladatel

Elsevier

Místo

Amsterdam

ISSN

0142-1123

Periodikum

INTERNATIONAL JOURNAL OF FATIGUE

Ročník

32

Číslo

8

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1265

Strany do

1269

Strany počet

5

BibTex

@article{BUT49755,
  author="Pavel {Hutař} and Luboš {Náhlík} and Zdeněk {Knésl}",
  title="The effect of a free surface on fatigue crack behaviour",
  journal="INTERNATIONAL JOURNAL OF FATIGUE",
  year="2010",
  volume="32",
  number="8",
  pages="1265--1269",
  issn="0142-1123"
}