Publication detail

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

POKLUDA, J. PIPPAN, R.

Czech title

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

English title

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

Type

journal article - other

Language

en

Original abstract

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.

Czech abstract

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.

English abstract

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.

Keywords in Czech

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

Keywords in English

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

RIV year

2007

Released

01.07.2007

ISSN

0921-5093

Journal

Materials Science and Engineering A

Volume

462

Number

1

Pages from–to

355–358

Pages count

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"
}