Detail publikace

Analysis of Roughness-Induced Crack Closure Based on Asymmetric Crack-Wake Plasticity and Size Ratio Effect

POKLUDA, J. PIPPAN, R.

Český název

Analysis of Roughness-Induced Crack Closure Based on Asymmetric Crack-Wake Plasticity and Size Ratio Effect

Anglický název

Analysis of Roughness-Induced Crack Closure Based on Asymmetric Crack-Wake Plasticity and Size Ratio Effect

Typ

článek v časopise - ostatní, Jost

Jazyk

en

Originální abstrakt

Asymmetric arrangements of stored crack-wake dislocations and low values of the size ratio SR, the characteristic microstructural distance divided by the plastic zone size, were found to be of basic importance for the misfit of crack flanks causing the roughness-induced crack closure. According to newly derived formulae including these effects, an estimation of a maximal level of roughness-induced crack closure can be made for metallic materials in the near threshold crack growth regime. On the basis of statistical considerations, the assessments can be extended for the whole fatigue crack propagation regime. A negligible level of roughness-induced crack closure in nanomaterials is predicted as a partial result of the statistical analysis.

Český abstrakt

Asymmetric arrangements of stored crack-wake dislocations and low values of the size ratio SR, the characteristic microstructural distance divided by the plastic zone size, were found to be of basic importance for the misfit of crack flanks causing the roughness-induced crack closure. According to newly derived formulae including these effects, an estimation of a maximal level of roughness-induced crack closure can be made for metallic materials in the near threshold crack growth regime. On the basis of statistical considerations, the assessments can be extended for the whole fatigue crack propagation regime. A negligible level of roughness-induced crack closure in nanomaterials is predicted as a partial result of the statistical analysis.

Anglický abstrakt

Asymmetric arrangements of stored crack-wake dislocations and low values of the size ratio SR, the characteristic microstructural distance divided by the plastic zone size, were found to be of basic importance for the misfit of crack flanks causing the roughness-induced crack closure. According to newly derived formulae including these effects, an estimation of a maximal level of roughness-induced crack closure can be made for metallic materials in the near threshold crack growth regime. On the basis of statistical considerations, the assessments can be extended for the whole fatigue crack propagation regime. A negligible level of roughness-induced crack closure in nanomaterials is predicted as a partial result of the statistical analysis.

Klíčová slova česky

Roughness; Crack closure; Crack-wake plasticity; Size ratio; Fatigue threshold; Nanomaterials

Klíčová slova anglicky

Roughness; Crack closure; Crack-wake plasticity; Size ratio; Fatigue threshold; Nanomaterials

Rok RIV

2007

Vydáno

01.07.2007

ISSN

0921-5093

Časopis

Materials Science and Engineering A

Ročník

462

Číslo

1

Strany od–do

355–358

Počet stran

4

BIBTEX


@article{BUT43664,
  author="Jaroslav {Pokluda} and Reinhard {Pippan},
  title="Analysis of Roughness-Induced Crack Closure Based on Asymmetric Crack-Wake Plasticity and Size Ratio Effect",
  journal="Materials Science and Engineering A",
  year="2007",
  volume="462",
  number="1",
  month="July",
  pages="355--358",
  issn="0921-5093"
}