Quantitative measurement of plastic strain field at a fatigue crack tip

Y. Yang, M. Crimp, R. A. Tomlinson, E. A. Patterson

Research output: Contribution to journalArticle

  • 7 Citations

Abstract

A novel approach is introduced to map the mesoscale plastic strain distribution resulting from heterogeneous plastic deformation in complex loading and component geometries, by applying the discrete Fourier transform (DFT) to backscattered electron (BSE) images of polycrystalline patches. These DFTs are then calibrated against the full width at half the maximum of the central peak of the DFTs collected from the same material tested under in situ scanning electron microscopy uniaxial tensile conditions, which indicates a close relationship with the global tensile strain. In this work, the technique is demonstrated by measuring the residual strain distribution and plastic zone size around a fatigue crack tip in a commercially pure titanium compact tension specimen, by collecting BSE images in a 15 × 15 array of 115mm square images around the fatigue crack tip. The measurement results show good agreement with the plastic zone size and shape measured using thermoelastic stress analysis.

LanguageEnglish (US)
Pages2399-2415
Number of pages17
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume468
Issue number2144
DOIs
StatePublished - Aug 8 2012

Profile

Fatigue Crack
crack tips
Crack Tip
Discrete Fourier transforms
Crack tips
Plastic Zone
Plastics
Plastic deformation
plastics
strain distribution
Electron
Electrons
stress analysis
Tensile strain
Stress Analysis
Discrete Fourier transform
Titanium
Plastic Deformation
Thermoelastic
Scanning Electron Microscopy

Keywords

  • Backscattered electron imaging
  • Crack
  • Fatigue
  • Plastic zone
  • Strain field
  • Thermoelastic stress analysis

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Quantitative measurement of plastic strain field at a fatigue crack tip. / Yang, Y.; Crimp, M.; Tomlinson, R. A.; Patterson, E. A.

In: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 468, No. 2144, 08.08.2012, p. 2399-2415.

Research output: Contribution to journalArticle

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