Mutiscale Plastic Deformation near a Fatigue Crack from Diffraction

Yinan Sun; Rozaliya Barabash; Hahn Choo; Peter K. Liaw; Yulin Lu; Donald W. Brown; Gene E. Ice

doi:10.4028/www.scientific.net/SSP.129.151

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HomeSolid State PhenomenaSolid State Phenomena Vol. 129Mutiscale Plastic Deformation near a Fatigue Crack...

Mutiscale Plastic Deformation near a Fatigue Crack from Diffraction

Abstract:

After an overload was imposed during a constant amplitude fatigue experiment, a retardation period was observed. The deformation in the vicinity of a crack tip was studied using neutron and x-ray microbeam-diffraction techniques, which provide millimeter and submicrometer spatial resolutions, respectively. From the neutron-diffraction measurements, compressive lattice strains and higher dislocation densities at the macroscale were observed in front of the crack tip, which indicates a plasticity induced crack-closure phenomenon. Furthermore, Laue patterns obtained from the microbeam diffraction at different locations near the crack tip show alternating regions with high and low dislocation densities at the mesoscale.

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Solid State Phenomena (Volume 129)

Pages:

151-156

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.129.151

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Online since:

November 2007

Authors:

Yinan Sun, Rozaliya Barabash, Hahn Choo, Peter K. Liaw, Yulin Lu, Donald W. Brown, Gene E. Ice

Keywords:

Crack, Fatigue, Neutron Diffraction, X-ray Microbeam

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