Estimation of mesoscale strain with fatigue crack propagation through quantitative analysis of displacement vector fields by a television-optical measuring complex

S. V. Panin, Yu P. Stefanov, P. S. Lyubutin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In the work, a computational algorithm for crack opening through surface image processing of loaded materials in fatigue fracture was developed and studied in experiment. In the first part of the paper we analyze model displacement fields to test and verify the proposed procedure and software, and in the second part, we consider experimentally taken images of surface regions with a propagating fatigue crack. It is shown that for experimental study of fatigue fracture, it is appropriate to use two parameters: the average crack opening displacement and the shear strain intensity around the crack tip. Analysis of images containing both a deformation zone and an opening crack reveals a nonlinear dependence of the crack opening displacement on the shear strain intensity and this suggests that the computation domain fails to cover the entire strain localization zone.

Original languageEnglish
Pages (from-to)88-95
Number of pages8
JournalPhysical Mesomechanics
Volume13
Issue number1-2
DOIs
Publication statusPublished - 2010

Fingerprint

crack propagation
Fatigue crack propagation
Television
quantitative analysis
crack opening displacement
cracks
shear strain
Cracks
Shear strain
Chemical analysis
crack tips
Fatigue of materials
image processing
Crack tips
computer programs
Image processing
Experiments

Keywords

  • Crack
  • Crack opening
  • Fatigue fracture
  • Plastic deformation
  • Television-optical measuring complex

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

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AU - Lyubutin, P. S.

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AB - In the work, a computational algorithm for crack opening through surface image processing of loaded materials in fatigue fracture was developed and studied in experiment. In the first part of the paper we analyze model displacement fields to test and verify the proposed procedure and software, and in the second part, we consider experimentally taken images of surface regions with a propagating fatigue crack. It is shown that for experimental study of fatigue fracture, it is appropriate to use two parameters: the average crack opening displacement and the shear strain intensity around the crack tip. Analysis of images containing both a deformation zone and an opening crack reveals a nonlinear dependence of the crack opening displacement on the shear strain intensity and this suggests that the computation domain fails to cover the entire strain localization zone.

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